Ceiling cornices from polystyrene: ready-made solutions for stretch and gypsum board ceilings

A modern interior is unthinkable without thoughtful work with ceiling space. Polystyrene ceiling cornices have become a universal tool for designers and builders, allowing them to solve several tasks at once: hiding technical joints, creating spectacular lighting, masking defects, and adding volume to a room. This lightweight, durable, and affordable material perfectly adapts to any type of ceiling structure - be it a stretch ceiling, drywall system, or classic plaster.

A properly selected ceiling cornice transforms even the simplest room. It visually raises the ceiling, creates a smooth transition between vertical and horizontal planes, and serves as a basis for lighting solutions. At the same time, installing a polystyrene ceiling cornice does not require special skills - it is enough to understand the basic principles of working with the material and the features of a specific ceiling type.

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Types of ceilings and their compatibility with polystyrene cornices

Each ceiling structure has its own characteristics that must be taken into account when selecting and installing decorative elements. Let's examine in detail how polystyrene ceiling cornices combine with various types of ceilings and what nuances are important to know.

Stretch ceiling: beauty requires a special approach

A stretch ceiling is a thin PVC film or fabric covering stretched over a special profile-bagette. This is the most delicate ceiling structure, requiring special care when installing any decorative elements.

Key principle: the cornice is attached exclusively to the wall, never to the stretch fabric. Even minimal pressure on the film can deform or puncture it. Therefore, the profile is installed in such a way as to create a small gap between the top of the cornice and the ceiling.

This gap is usually 5-10 millimeters and serves several functions. First, it ensures the safety of the stretch fabric. Second, it creates natural ventilation of the above-ceiling space, preventing condensation. Third, it allows for the installation of hidden lighting - one of the most spectacular solutions in modern design.

Features of profile selection for stretch ceilings:

The width of the cornice should be sufficient for reliable attachment to the wall. Narrow profiles less than 5 centimeters may not be stable enough. The optimal option is cornices 7-15 centimeters wide, which have a larger contact area with the wall and create a visually harmonious transition.

The weight of the cornice is critical when working with stretch ceilings. Polystyrene is unrivaled here - its density is several times less than polyurethane or plaster, which reduces the load on the fasteners. Even a wide decorative profile weighs no more than 200-300 grams per linear meter.

The shape of the profile also matters. For stretch ceilings, cornices with a flat top are preferable, as they minimize the risk of contact with the fabric. Complex multi-level profiles with protruding elements require more precise installation.

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Drywall ceiling: maximum possibilities

A drywall ceiling is the most favorable base for installing a ceiling cornice. There are no limitations of stretch systems here; any profiles and installation techniques can be used.

Mounting options:

First method - attachment only to the wall. Similar to a stretch ceiling, the cornice is fixed to the vertical surface without touching the ceiling plane. This method is used when wanting to create a niche for lighting or when the drywall ceiling is already painted and there is no desire to damage it.

Second method - combined attachment to the wall and ceiling. The cornice is glued simultaneously to both surfaces, ensuring maximum strength and no gaps. This option is optimal for wide, heavy profiles with rich decoration.

Third method - attachment through embedded elements. If a multi-level drywall ceiling has a complex configuration with niches and height differences, cornices can be mounted on special embedded blocks or profiles installed during the frame creation stage.

Advantages of working with drywall:

The drywall surface is perfectly even, which simplifies cornice fitting and ensures tight adhesion along the entire length. There is no need to compensate for unevenness with an additional layer of glue or putty.

The material holds fasteners well. In addition to glue, butterfly anchors or self-tapping screws can be used, which is relevant for particularly wide and heavycrown moldingsprofiles. Mechanical fasteners enhance connection reliability.

Painting in one tone. After installing the ceiling cornice, you can paint the entire surface — both the ceiling and the cornice — with a single layer of paint. This creates the impression of a monolithic structure, as if the cornice is part of the building's architecture.

Plastered concrete ceiling: construction classic

Old, good plastered concrete ceilings are still found in the majority of homes. Working with them is simple, but there are some nuances.

Surface preparation — key to success:

Concrete and plaster can have significant unevenness. Before installing the cornice, check the ceiling’s level and wall verticality with a level. If the deviation exceeds 5 millimeters per meter, preliminary leveling is required.

Old paint or whitewash may peel off. Run your hand over the surface — if a white mark remains, the layer is not strong. Remove the old coating down to the solid base and prime the surface. Otherwise, the cornice will adhere to the paint, not the concrete, and may eventually peel off along with it.

Choosing adhesive composition:

For concrete bases, use high-strength polymer adhesives. Ordinary PVA is not suitable here — a specialized polystyrene mounting adhesive like "Moment Montazh" or similar is required. Some professionals prefer gypsum-based adhesive putty — it simultaneously secures the cornice and fills in irregularities.

For added reliability, mechanical fastening — screws with anchors — can be used. They are screwed into the ceiling or wall through the cornice body at 30-40 cm intervals. After installation, the screw heads are spackled and painted over.

Wooden ceiling: eco-friendliness and unique aesthetics

Wooden ceilings are found in country houses, dachas, and eco-style interiors. Polystyrene cornices pair beautifully with wood, creating an interesting texture contrast.

Nuances of installation on wood:

Wood "breathes" — it expands when humid and contracts when dry. This natural movement of the material must be considered. Use an elastic adhesive to secure the cornice, which compensates for minor movements of the base.

Wooden surfaces are often uneven due to grain and knots. Choose wide, flexible profiles that can follow the relief. Fill gaps with acrylic sealant in the color of the wood or cornice.

If the ceiling is lacquered, adhesion will be weak. Lightly sand the contact area to remove gloss, then prime it. This improves adhesive bond strength.

Profiles for different ceiling heights: how to choose correctly

Room height significantly affects interior perception. An incorrectly chosen cornice may visually "press down" a low ceiling or become lost in spacious high ceilings. Let’s examine which profiles suit different heights.

Standard ceilings 2.5–2.7 meters

This is the most common height in multi-apartment buildings. Here, it’s important to strike a balance: the cornice should be noticeable but not dominant.

Optimal profile width: 5–10 centimeters. Narrower cornices disappear and fail to serve a decorative function. Too wide profiles visually lower an already low ceiling.

Profile shape: smooth profiles or models with shallow relief are preferred. Heavy cornices with ornate moldings are suitable only in spacious rooms of 25 square meters or more. In small rooms, they create a sense of clutter.

Color solution: light shades are the best choice. A white cornice on a white or light ceiling creates a unified space, visually lifting it. Dark or contrasting cornices "cut" height and make the room appear low.

Niche for backlighting: an excellent way to visually increase height. Hidden LED strip creates an upward-directed light beam, making the ceiling appear to float. Use special profiles with a 5–7 cm wide ledge, onto which the LED strip is mounted.

Low ceilings up to 2.5 meters

Soviet Khrushchev-era apartments and some modern budget new builds have ceilings 2.4–2.5 meters high. Here, every centimeter counts.

Minimalist approach: narrow, smooth profiles 3–5 cm wide. Their purpose is to neatly mark the boundary without overloading the space. No moldings or complex decoration.

Hidden installation: the cornice is mounted so that its side profile is minimal. Essentially, only the bottom edge of the profile is visible, while the rest is concealed in the corner between the wall and ceiling. This creates a clean line without a bulky protrusion.

Essential backlighting: for low ceilings, a niche for backlighting is not luxury but necessity. Soft upward-directed light performs wonders — the ceiling appears at least 20–30 cm higher. Use warm white light at 8–10 watts per meter.

Color play: if walls and ceiling are painted in one light tone, the cornice should also match. Monochromatic solution erases clear boundaries and expands the space.

High ceilings from 3 meters

Spacious apartments in Stalinist buildings, pre-revolutionary houses, and modern luxury constructions allow experimenting with large-scale forms.

Wide profiles: here, 12-20 cm and wider cornices are appropriate. They emphasize the scale of the room and create an elegant classic look. Ornate profiles with rich moldings, floral motifs, and complex geometry look luxurious.

Multi-level compositions: in high rooms, you can use several cornices at different levels. For example, a wide main cornice at the ceiling and a narrower molding 40-50 cm lower. This creates depth and architectural expressiveness.

Contrasting solutions: height allows playing with color. A dark cornice on a light ceiling or a gilded profile in a classic interior looks striking. Contrast highlights architectural details.

Hidden lighting with effect: you can create a wide niche for powerful LED lighting that literally floods the ceiling with light. At heights over 3 meters, this is safe — the light diffuses and does not glare.

Ceilings over 4 meters high

Lofts, converted industrial buildings, mansions, and museum spaces with 4-6 meter ceilings require a special approach.

Large-scale profiles: standard cornices will disappear at such a height. Profiles 20 cm wide or more are needed, often combined — multiple strips mounted on top of each other. This creates a volumetric, multi-layered structure.

Material combination: polystyrene can be combined with polyurethane elements, gypsum moldings, wooden overlays. Such a composition looks rich and matches the scale of the room.

Decorative lighting: in ultra-high rooms, lighting may be decorative rather than hidden. Chandeliers, wall sconces, spotlights, integrated into the cornice or placed nearby, are used.

Functionality: at such a height, the cornice can serve not only decorative but also practical purposes. It can hold curtain systems, zoning cornices, acoustic panels.

Mounting technology: step-by-step instructions for different types of ceilings

Installing a ceiling cornice — a process requiring precision and adherence to technology. We will detail each stage for various types of ceiling structures.

Preparation stage: what to do before starting work

Material acclimatization. Bring the cornices into the room 24 hours before installation. This is especially important if the material was stored on a cold warehouse or outdoors. Polystyrene must adapt to room temperature to avoid deformation after installation.

Surface cleaning. Remove dust, dirt, grease stains from the mounting area. Use a damp cloth and, if necessary, a degreaser. Allow the surface to dry completely.

Priming. Treat the installation area with a penetrating primer. This strengthens the base and improves adhesive bond. Especially important for loose and porous surfaces.

Marking. Using a laser or spirit level, mark a horizontal line around the room’s perimeter. This is the lower edge of the cornice. The line must be perfectly level — even the slightest tilt will be noticeable. If working with a suspended ceiling, leave at least 5 mm clearance from the fabric.

Cutting angles. The most critical step. Use a 45-degree miter saw for internal angles. If the room’s angle is not exactly 90 degrees (which is often the case), experiment with cutting. First, cut two small pieces and test the fit. Once you find the correct angle, transfer it to the main strips.

Mounting on a suspended ceiling: maximum care

Step 1: Choosing adhesive. For suspended ceilings, use a fast-drying adhesive that does not require prolonged pressing. "Moment Montazh Express" or "Titan" are good options. Avoid solvent-based adhesives — their vapors may damage the PVC film.

Step 2: Applying adhesive. Apply adhesive only to the part of the cornice that will adhere to the wall. Leave the upper part, facing the ceiling, clean — no adhesive should be there. Apply evenly, in a zigzag or dotted pattern with 3-5 cm spacing.

Step 3: Installation. Press the cornice firmly against the wall exactly along the marked line. Press evenly along the entire length for 30-60 seconds. Important: do not press on the upper part of the cornice to avoid bending it upward toward the ceiling.

Step 4: Fixation. While the adhesive dries (usually 24 hours), secure the cornice with painter’s tape. Apply tape strips every 40-50 cm, adhering them to the wall and lower part of the cornice. This prevents sliding under its own weight.

Step 5: Checking the gap. Ensure a uniform 5-10 mm gap remains between the cornice and the suspended ceiling along the entire length. If the cornice touches the film at any point, gently pull it away from the ceiling until the adhesive has dried.

Step 6: Sealing joints. After 24 hours, when the adhesive is fully dry, fill the joints between strips with acrylic sealant. Use white sealant or matching the cornice color. Smooth the joint with a wet finger or rubber putty knife.

Mounting on a gypsum board ceiling: reliability above all

Step 1: Determining mounting method. Decide whether to mount the cornice only to the wall (with clearance from the ceiling) or to both the wall and ceiling simultaneously. Choose the first option for hidden lighting, the second for a monolithic look.

Step 2: Preparing adhesive. For gypsum board, a gypsum finishing putty mixed to the consistency of thick sour cream is ideal. It both adheres and fills small irregularities. Polymer adhesive can also be used, but putty gives a cleaner result.

Step 3: Applying compound. Apply adhesive or putty to the back of the cornice using a notched trowel. The layer should be even, 2-3 mm thick. If mounting to two surfaces, apply the compound to both the "wall" and "ceiling" sides of the profile.

Step 4: Installation. Attach the cornice to its place and press firmly. Excess glue/spackle will squeeze out along the edges—immediately wipe it away with a damp putty knife. Work carefully to avoid spreading the compound onto clean surfaces.

Step 5: Mechanical reinforcement (optional). For especially wide cornices or in areas with increased vibration (e.g., near a railway), additionally secure the profile with self-tapping screws. Drive them in at 40 cm intervals, sinking the heads 1–2 mm. Later, spackle the screw locations.

Step 6: Final finishing. After 24 hours, spackle all joints, screw locations, and minor defects. Once dry, sand with 180–220 grit sandpaper. Prime and paint the cornice together with the ceiling.

Installation on concrete ceiling: traditional technology

Step 1: Enhanced priming. Concrete is a fussy substrate. Prime it twice with drying intervals in between. Use a type such as "Betonokontakt" that creates a rough surface for better adhesion.

Step 2: Choosing adhesive. Concrete requires a strong polymer adhesive. "Moment Montazh Superstrong", "Quelyd Mastifix", or equivalents. Apply in a thick layer—3–5 mm—to compensate for possible unevenness.

Step 3: Spot or continuous application. If the ceiling is flat, apply adhesive in a continuous strip. If there are waves or unevenness, apply in spots, large drops every 5–7 cm. When pressed, the adhesive will spread and fill gaps.

Step 4: Drying time. After applying adhesive, wait 3–5 minutes. The adhesive should slightly "dry"—this improves its bonding. Do not wait too long, otherwise it will dry out.

Step 5: Pressing. Attach the cornice and press firmly. Hold for at least 2–3 minutes. This is critically important for concrete—bonding occurs more slowly than with drywall. Use supports or an assistant to ensure even pressing along the entire length.

Step 6: Additional fixation. For added security, you can screw in several anchors through the cornice into the ceiling. After the adhesive dries, you can unscrew the screws and spackle the holes. Or leave the fasteners permanently—they ensure long-term reliability.

Step 7: Removing excess. Immediately remove any squeezed-out adhesive while it is still wet. Use a damp sponge or putty knife. Once dried, you’ll need to cut it with a knife and sand it, which damages the surface.

Niche for LED strip: light that transforms space

Hidden ceiling lighting through a niche in the cornice—one of the most effective techniques in modern design. A properly organized system creates the illusion of a floating ceiling, visually increases room height, and adds coziness.

Choosing profile for lighting

Not every cornice is suitable for mounting LED strips. Special profiles with a flange—a horizontal surface on which the LED strip is laid—are required.

The flange width must be at least 5 cm. This ensures sufficient distance from the wall to the light source. If the flange is too narrow, the light will be uneven, with visible points from individual LEDs.

The lip height—the vertical wall covering the strip from direct view—must be at least 3–4 cm. The strip should not be visible when standing in the room. Otherwise, the effect of hidden lighting disappears, and individual glowing points become visible.

Flange material and color. Ideally, the inner surface of the niche should be white or silver. This improves light reflection. A black or dark niche "absorbs" part of the light beam.

Types of LED strips for ceiling lighting

By power:

• 4.8 W/m — for decorative lighting, creating soft glow

• 9.6 W/m — standard for residential spaces, provides good light output

• 14.4 W/m and above — for bright lighting, when the backlight serves as the main light source

By color temperature:

• 2700–3000K (warm white) — cozy home lighting, relaxing

• 4000–4500K (neutral white) — universal option, close to daylight

• 5500–6500K (cool white) — invigorating light, visually expands space

• RGB — multi-color strips with adjustable hue to match mood

By protection:

• IP20 — for dry rooms (living room, bedroom, office)

• IP65 - water-resistant, for kitchens and bathrooms

LED Strip Installation: Step-by-Step Guide

Step 1: Cable Laying. Before installing the valance, lay the power cable from the switch or control unit to the locations where the strip will be installed. The cable can be hidden in a groove or run along the wall surface — it will be covered by the valance later. Leave 20–30 cm of extra cable length at each end.

Step 2: Power Supply Installation. LED strips operate at 12 or 24 volts, so a step-down transformer (power supply) is required. Calculate its power: strip length (m) × power per meter (W) + 20% reserve. For example, for a 15-meter strip with 9.6 W/m, you need a 15 × 9.6 × 1.2 = 173 W unit. Round up to the nearest standard — 180 or 200 W.

The power supply can be placed behind the valance in a corner, in a gypsum board ceiling niche, or behind a stretch ceiling (if access is available). Proper ventilation is essential — the unit heats up during operation.

Step 3: Strip Connection. Measure the required strip length. Cutting is only allowed at designated points — every 5–10 cm, there are scissors-shaped marks. Solder wires to the contacts or use solderless special connectors.

Step 4: Placement in the Niche. Most strips have an adhesive layer on the back. Remove the protective film and stick the strip to the valance’s shelf. Position it closer to the wall, 2–3 cm from the edge. This ensures even ceiling illumination.

Step 5: Connecting Segments. If connecting multiple strip segments, do so in parallel, not in series. Run a separate cable from the power supply to each side of the room. Series connection causes brightness to drop in distant areas.

Step 6: Testing. Before finalizing valance installation, turn on the lighting and test its operation. Evaluate brightness, evenness of illumination, and absence of dark zones. Adjust strip position if necessary.

Step 7: Control. For a simple single-color strip, a standard switch is sufficient. For dimmable strips, install a dimmer to adjust brightness. For RGB strips, use a controller with a remote or smartphone app.

Common Mistakes When Installing Lighting

Error 1: Insufficient Niche Width. If the shelf is narrow (3–4 cm), light hits the ceiling at a sharp angle, creating a bright band near the wall and a dark center. Optimal width is 6–8 cm.

Error 2: Visible Strip. When the valance edge is low or the strip is placed too close to the edge, LEDs become visible when entering the room. This ruins the effect. The strip must be deeply recessed into the niche.

Error 3: Insufficient Power. A 4.8 W/m strip only provides a faint glow. For a realistic floating ceiling effect, you need at least 9.6 W/m, preferably 14.4 W/m.

Error 4: Incorrect Power Supply. An underpowered unit will be overloaded and fail quickly. Always choose a unit with 20–30% extra capacity over the calculated power.

Error 5: Series Connection. If current flows through the entire strip in series, the beginning will be bright and the end dim. Always connect segments in parallel.

Masking Defects: How a Valance Conceals Imperfections

Perfectly flat walls and ceilings are rare. Builders often leave imperfections: unevenness, level discrepancies, cracks, gaps. A correctly installed polystyrene ceiling valance masterfully masks these flaws.

Wall-to-Ceiling Joint Irregularities

The most common issue is a wavy line where the wall meets the ceiling — caused by uneven plaster or shifted floor joists.

Solution: A wide valance (10–15 cm) fully covers the problematic area. It is mounted to a flat section of wall below, while the upper part hides all imperfections. Even if the gap between the valance and ceiling is uneven (5–15 mm), it remains invisible — the eye cannot penetrate beyond the profile.

Compensation Technique: If the wall is highly uneven, apply more adhesive in recesses and less on protrusions. This levels the profile horizontally, and gaps behind the valance remain hidden.

Cracks and Gaps

Micro-cracks between floor joists, gaps around window openings, and separated wallpaper seams — all these are noticeable and spoil the repair’s impression.

Solution: A valance running around the room’s perimeter covers the upper part of walls, where defects most commonly occur. Cracks become hidden behind the decorative element and are invisible.

Bonus: Installing a valance stabilizes problematic zones. The glued profile adds extra reinforcement, helping to prevent crack propagation.

Ceiling Height Discrepancies

Sometimes, the ceiling in one part of the room is 1–3 cm higher than in another — especially noticeable in older homes where settling has occurred over time.

Solution: When installing the valance, align strictly with a horizontal reference line. The valance runs straight, while the gap between it and the ceiling varies. Where the ceiling is lower, the gap is smaller; where higher, it’s larger. Visually, this is not noticeable, as we cannot see what lies behind the valance.

Important: If the height difference is very large (more than 3 cm), it’s better to partially level the ceiling with putty, otherwise the difference may become noticeable indirectly (shadows, lighting variations).

Wall curvature

The vertical plane of the wall may also be imperfect - with convexities, concavities, and uneven surfaces.

Solution: Polystyrene has a certain flexibility. Narrow and medium profiles (up to 10 cm) easily replicate smooth wall curves with a radius of 1.5-2 meters. When installing, slightly press or release the cornice to match the relief.

For serious irregularities, use more adhesive to fill gaps. After drying, seal the gaps between the cornice and the wall with acrylic sealant.

Multi-level ceilings and niches

In modern apartments, multi-level gypsum board ceilings with height variations are often installed. Transitions between levels look unfinished without decorative treatment.

Solution:polystyrene cornicesThey are ideal for framing niches and steps. They are mounted around each level, creating clear architectural lines. This not only hides gypsum board technical joints but also adds structural depth to the interior.

Decorative effect: Multi-level cornices with lighting for each level create an effect of complex architecture. The room appears more luxurious and interesting.

Communication traces

Sometimes cables, ventilation pipes, or traces from removed curtain cornices run along the top of walls.

Solution: A wide ceiling cornice completely hides everything located in the upper wall zone at a height of 10-15 cm from the ceiling. There is no need to notch walls or reroute communications — simply cover them with a decorative element.

Ceiling and cornice painting: finishing touch

Painting is the final stage that unifies the ceiling and cornice into a single composition. Properly executed painting makes the cornice indistinguishable from the building's architectural elements.

Preparation for Painting

Joint spackling. After installing the cornice, carefully spackle all joints between strips, fastener locations (if using self-tapping screws), and gaps between the cornice and wall/ceiling. Use finishing acrylic spackle — it is elastic and does not crack.

Sanding. When the spackle dries (usually within 8-12 hours), sand it with fine-grit sandpaper (180-220 grit). Work carefully to avoid damaging the cornice's relief. Remove dust with a vacuum cleaner or damp cloth.

Priming. Always prime the cornice before painting. Polystyrene has a smooth surface, and paint may not adhere evenly or may run on it. Primer creates an adhesive layer. Use deep-penetration acrylic primer. Apply with a brush or roller in one coat.

Paint Selection

Paint type: Only water-based and acrylic paints are suitable for polystyrene. Alkyd enamels, oil-based paints, and solvent-based compositions will degrade polystyrene. Best options:

• Matte acrylic — universal, affordable

• Latex — more resistant to abrasion and moisture

• Silicone — premium variant with self-cleaning properties

Gloss level:

• Matte — most popular choice, hides minor defects

• Semi-matte — easier to clean than matte

• Glossy — rarely used, emphasizes all irregularities

Color:

• White — classic, makes the ceiling appear higher, universally matches any interior

• Matching ceiling color — creates a monolithic effect

• Contrasting — highlights the cornice as a decorative element (gold, silver, dark tones)

Painting technique

Tools: Short-pile roller for large flat surfaces, 3-5 cm wide brush for textured areas and hard-to-reach spots, painter’s tape to protect walls.

Surface protection. Apply painter’s tape along the bottom edge of the cornice to protect wallpaper or painted walls. If painting only the cornice and not the entire ceiling, also protect the ceiling surface.

First coat. Dilute paint with water by 5-10% for better penetration. Apply in a thin, even layer. Start with textured areas using a brush, then roll over flat surfaces. Roll in one direction only. Allow to dry for 4-6 hours.

Second layer. Apply undiluted paint. This layer provides the final finish and even color. Work quickly to avoid drying streaks. The roller should be moderately damp—not dry, but not dripping.

Third layer (if necessary). If gaps remain or the color is uneven after two layers, apply a third layer. This is typically required when painting in dark or saturated colors.

Decorative painting techniques

Gilding and patination. For classic interiors, gilding of the relief elements of the cornice looks striking. First, paint the entire cornice in a base color (white or bone). After drying, lightly touch up the raised relief parts with gold paint using a dry brush. This emphasizes the volume and adds luxury.

Antique effect. Light strokes of gray or brown paint are applied to a white cornice to simulate the patina of time. This technique suits interiors in Provence, shabby chic, and vintage styles.

Two-tone coloring. Relief elements are painted one color, while the background is painted another. For example, a white background with silver ornamentation. This requires care and the use of painter’s tape or stencils.

Painting along with the ceiling

If you are doing a comprehensive renovation including painting the entire ceiling, it makes sense to paint the cornice simultaneously. This ensures a perfect color match—there are even minimal differences in the shade of white.

Sequence: First, paint the entire ceiling, including the area behind the cornice (if there is a gap). Then paint the cornice. As the final pass, use the roller to blend the ceiling and cornice into one color—this creates a smooth transition without visible lines.

Master’s checklist: step-by-step quality control of installation

A professional installer uses a system of checkpoints to guarantee an ideal result. This checklist will help both installers and clients evaluate the quality of work.

Before starting work

☐ Material acclimatization. Cornices have been left in the room for at least 12 hours at the installation temperature.

☐ Check for completeness. All strips, corner elements, fasteners, and materials are available. No damage or defects present.

☐ Surface preparation. The installation area is cleaned of dust, grease, and peeling paint. Surface is dry.

☐ Primer applied. The substrate has been primed and is dry.

☐ Tools prepared. All necessary tools are within reach: miter saw, level, adhesive, putty knives, hacksaw, painter’s tape.

Marking and Preparation

☐ Horizontal alignment checked. A strictly horizontal line has been marked around the perimeter using a laser or water level.

☐ Height from ceiling determined. For a suspended ceiling—minimum 5 mm gap. For gypsum board—according to design (with or without gap).

☐ Corners trimmed. Corner joints have been fitted. They must align perfectly, with no gaps.

☐ Strips prepared. Cut to required length, ends sanded smooth.

Installation

☐ Adhesive applied correctly. Evenly, in the required amount, to the correct side of the profile.

☐ Installed level. Each strip is precisely set according to the marking. Checked with a level.

☐ Pressed firmly. Cornice pressed tightly against the base for at least 30 seconds.

☐ Secured. Painter’s tape or other securing methods used during drying time.

☐ Gap maintained. For suspended ceilings, the cornice does not touch the film anywhere.

☐ Excess adhesive removed. Excess adhesive wiped off immediately with a damp cloth.

☐ Joints tight. No gaps wider than 0.5 mm between strips.

After installation (after 24 hours)

☐ Adhesive fully dried. Cornice holds firmly, does not detach under light pressure.

☐ Joints filled. All seams filled with acrylic sealant or putty.

☐ Surface is leveled. After the spackle dries, joints are sanded and not perceptible by touch.

☐ Defects are repaired. Minor chips, scratches, dents are spackled and sanded.

☐ Cove is primed. A primer layer has been applied for painting.

Lighting (if applicable)

☐ Wiring is installed. Cables are in place and routed into the cove niche.

☐ Power supply is installed. Correctly rated, securely mounted, with adequate ventilation.

☐ LED strip is positioned. Applied evenly, at the correct distance from the edge, without sagging.

☐ Connections are made. All connections are soldered or made with quality connectors.

☐ Test passed. Lighting works, brightness is uniform, no flickering, dark spots, or visible points.

☐ Control is set. Switch/dimmer/controller operates correctly.

Painting

☐ Surface is ready. Cove is clean, dry, and primed.

☐ Protection is applied. Painter’s tape is applied to protect walls and other surfaces.

☐ Paint is prepared. Correct type and color, proper consistency.

☐ First coat applied. Evenly applied, without drips or undercoating.

☐ Intermediate drying. Interval between coats is maintained according to paint instructions.

☐ Second coat applied. Finish coat is smooth, without defects.

☐ Color is uniform. No color variation across different areas.

Final inspection

☐ Overall appearance. Cove blends seamlessly with the ceiling, no visible flaws.

☐ Level is maintained. Level check shows perfect alignment.

☐ Joints are invisible. Joints between boards are not visible or minimally noticeable.

☐ Angles are perfect. Internal and external angles meet tightly.

☐ Mounting is secure. Cove does not wobble, detach, or loosen.

☐ Lighting works. If installed, operates without issues.

☐ Area is cleaned. Work area is tidied, repair marks removed.

☐ Client is satisfied. Result meets expectations and technical specifications.

STAVROS and Hi Wood partnership: quality proven by thousands of projects

Material selection — half the success of any renovation. STAVROS, working in close partnership with Hi Wood (HiWood, Хай Вуд, Хайвуд), offers ceiling cornices made of polystyrene that combine European quality with reasonable pricing.

Advantages of Hi Wood products

Modern manufacturing technologies. Hi Wood uses automated lines of the latest generation, guaranteeing perfect geometry of each item. Dimensional deviations do not exceed 0.5 millimeters — critical for tight fitting in corners.

Polystyrene quality. The manufacturer uses high-density polymer raw material, subjected to multi-stage purification. The material has no foreign inclusions, is structurally uniform, does not crumble or break during processing.

Clarity of relief. Decorative HiWood profiles feature perfect ornament detail. Every swirl, every line is clearly defined, without blurring or smearing. This is achieved through precise milling and high-quality molding matrices.

Ecological safety. HiWood polystyrene does not contain harmful volatile compounds and is safe for health. Certified to meet European standards.

Durability. Products do not yellow over time, do not deform under temperature fluctuations, and retain their geometry for decades. Manufacturer’s warranty — 25 years with proper use.

Assortment for any task

The STAVROS catalog features hundreds of profiles from partner Hi Wood:

Smooth cornices from 3 to 15 cm wide — ideal for minimalist and modern interiors. Perfectly suited for stretch ceilings and recessed lighting installations.

Ornamented profiles — a rich collection of classic patterns. From restrained linear designs to lavish baroque moldings. Width up to 20 cm.

Specialized profiles for concealed lighting with shelves of varying widths (5–10 cm) and 3–6 cm high edges. Specifically designed for LED systems.

Corner elements and decor — ready-made solutions for corners, joints, and compositions. Save installation time and guarantee a flawless result.

Why Choose STAVROS

Direct deliveries. Working directly with Hi Wood manufacturer allows us to offer competitive prices without middleman markups.

Quality guarantee. Each batch undergoes inspection. If you find a defect — we’ll replace it without questions.

Professional consultations. Specialists will help you select the right profile for your project, calculate the required quantity, and advise on installation techniques.

Fast delivery. Our own logistics network ensures delivery across Russia in the shortest possible time. To major cities — the next day after ordering.

Comprehensive solutions. In addition to cornices, the catalog includes moldings, baseboards, columns, and pilasters — all from one manufacturer, in a unified style.

By choosing STAVROS, you’re not just getting material — you’re getting a complete solution for creating a flawless interior. Hi Wood product quality, STAVROS team professionalism, and your desire to create a beautiful home — the formula for a successful result.

Polystyrene ceiling cornices — a universal tool of modern design. Suitable for any type of ceiling, solving numerous practical and aesthetic tasks, affordable, and easy to install. The right profile, proper installation, and quality finishing transform an ordinary room into a thoughtfully designed space with character and style. Trust your material choice to proven partners — STAVROS and Hi Wood — and your interior will delight you with its flawless appearance for years to come.