Polyurethane Door Jamb Selection and Installation Guide

Rigid polyurethane door jambs are manufactured using a closed-cell structure that prevents moisture absorption. The material maintains a core density targeted around 150-220 kg/m³ (production target ~160 kg/m³), within a standard density range of 150-220 kg/m³ (production target ~160 kg/m³). This high-density formulation ensures high surface impact resistance while keeping overall component weight low compared to traditional stone or concrete trim.

Thermal tolerance ranges from -100 °C / +80 °C, making the profiles resistant to thermal expansion and freeze-thaw cracking in outdoor applications. Water absorption remains strictly below 1%, eliminating concerns of rot or swelling. All profiles are supplied with a factory-applied primer. While an additional site-applied primer coat is optional depending on topcoat specifications, outdoor applications strictly require a topcoat of UV-resistant exterior paint to maintain long-term surface integrity. Note that these profiles are purely decorative elements and must never be utilized to carry structural loads.

Choosing the correct profile width and depth depends on the door dimensions and surrounding wall scale. Standard interior openings measuring 90 cm by 210 cm typically utilize trim widths between 8 cm and 12 cm. For grand entryway doors exceeding 240 cm in height, wider profiles ranging from 15 cm to 22 cm maintain balanced visual proportions.

Technical considerations for profile depth include:

• Wall Projection: Profile depth should exceed adjacent baseboard or wall reveal depth by at least 5 mm to create a clean visual termination line.
• Casing Overlap: Ensure the rear profile channel provides sufficient contact area against both the wall substrate and the door frame jamb.
• Architectural Symmetry: Cross-sections featuring classical architraves require careful alignment at corner intersections to match header and side jamb profiles seamlessly.

Accurate material calculation prevents project delays and reduces waste. Measuring a door opening requires taking net outer dimensions of the door frame across three points: vertical left jamb height, vertical right jamb height, and horizontal header width.

When calculating total linear material required, account for 45-degree miter joints at the top corners. Because each corner miter adds a length equal to the width of the profile itself to the outer edge, this added dimension must be factored into each piece. For a standard single door frame, add a mandatory 10% to 15% allowance to total linear meterage to cover corner cuts and pattern alignment trim losses.

Proper attachment requires combining chemical bonding with physical anchors. Relying solely on adhesives or improper chemical compounds leads to eventual joint separation.

Follow this technical sequence during installation:

• Surface Preparation: Substrates must be completely clean, dry, and free from dust or loose paint.
• Miter Cutting: Cut profile ends at precise 45-degree angles using a high-tooth saw blade.
• Adhesive Application: Apply high-tack polyurethane (PU) assembly adhesive along the rear contact channels. Silicone adhesives are strictly forbidden due to inadequate bond strength.
• Mechanical Fixing: Secure profiles mechanically with corrosion-resistant screws or mechanical fasteners anchored into the substrate. Mechanical anchoring is mandatory to resist movement during adhesive cure.

After the polyurethane adhesive has fully cured, seam finishing ensures seamless transitions at corner miters and wall junctions. Fill screw head countersinks and corner joints using an exterior-grade acrylic or epoxy filling compound.

Once the filler dries, sand all treated joint areas smooth using 180-220 grit sandpaper to achieve a uniform surface texture. Wipe away fine dust before painting. Apply an optional additional coat of primer over exposed filler spots if required by the topcoat manufacturer. Finally, apply a minimum of 2 coats of high-grade paint. For exterior installations, using UV-resistant paint is mandatory to protect the polyurethane material from solar radiation and color degradation.

Failures in door jamb installations usually stem from incorrect adhesive choice or missing mechanical anchors. Using standard neutral silicone instead of dedicated polyurethane assembly adhesive causes bond failure under thermal stress. Omitting mechanical screws allows profile creeping before adhesive curing finishes.

Before purchasing materials for your project, verify the following technical checklist:

• Confirm the raw substrate material is structural and capable of holding mechanical screw anchors.
• Verify total linear quantities include the required 10-15% allowance for 45-degree miter cuts.
• Ensure selected paint products are explicitly rated for UV exposure if installing outdoors.
• Confirm decorative surrounds and columns are specified as non-load-bearing elements within architectural drawings produced for Polure projects.

Polure ürün grubundan kapı sövesi seçimi yapmadan önce şu hususları netleştirmeniz önerilir:

• Uygulama alanının iç mekan mı yoksa dış cephe mi olduğu belirlendi mi?
• Kapı kasası genişliği ve yüksekliği ile orantılı profil kesiti seçildi mi?
• Metraj hesabına %10-%15 zayiat payı eklendi mi?
• Montaj için gerekli PU yapıştırıcı, dübel, vida ve 180-220 zımpara tedarik edildi mi?
• Dış cephe için UV dayanımlı son kat boya planlandı mı?