Kingspan TR27

Thermaroof T27 is among the insulation boards in Kingspan’s Thermaroof range of products.

What is Kingspan Thermaroof?

Kingspan Thermaroof T27 is primarily a roof insulation product. The board is compatible with many green roofing systems and has been designed for use on flat roofs that have been waterproofed using specific systems, as outlined by the manufacturer.

What is Kingspan Thermaroof TR27 Used for?

Thermaroof TR27 is used in both new builds and refurbishments to:

• Insulate flat roofs – installed over timber, metal, and concrete decks.
• Insulate green roofs – installed under the green roof.

TR27 is only compatible with these waterproofing membranes:

• Bitumen-based waterproofing.
• Partially bonded built up felt waterproofing.
• Fully adhered single ply waterproofing.
• Cold liquid applied waterproofing.
• Mastic asphalt waterproofing membranes.

If you’re unsure whether TR27 insulation works with your waterproofing system, consult your waterproofing supplier or Kingspan for confirmation.

Thicknesses of TR27 Insulation

TR27 comes in the following thicknesses:

• 25mm, 60mm, 80mm, 100mm, 120mm, 130mm, 140mm, 150mm, 160mm.

The correct thickness for your roof depends on the desired thermal performance. Kingspan advises you to calculate the U-value and carry out a condensation risk analysis for your project to determine the appropriate TR27 thickness to use.

Benefits of Kingspan Thermaroof

Thermaroof TR27 stands out for several reasons:

• It’s compatible with different types of flat roofs.
• Its rigid structure means there’s reduced water transfer through the panel.
• It’s lightweight and easy to install.
• It’s easy to cut using a fine-toothed saw. You can score thinner T27 boards with a sharp knife and snap the panel over a straight edge. Flip the board and use the knife to cut the other side.

Why choose our Kingspan Thermaroof insulation?

We deliver all Kingspan TR27 boards as packaged by the manufacturer. Our boards come in packs of varying sizes, so it’s easy to find a pack with the correct number of boards for your project.

We store all Thermaroof boards in moisture-free locations away from sunlight to preserve the boards’ integrity.

Green roof? Pair it with the dependable TR27 insulation. It’s quick to fit, but tough to beat. Order Kingspan Therma TR27 today and lock in lasting performance.

FAQ

What is TR27 insulation?

TR27 is a roofing insulation board from the Kingspan Thermaroof range of innovative insulation products. It features a polyisocyanurate (PIR) core, which is sandwiched between two glass tissue facings. The board is designed for use in flat roofs with compatible waterproofing systems. Contact Kingspan to confirm whether your roof’s waterproofing system is compatible with TR27.

Where can I buy TR27 insulated roof panels near me?

You can buy genuine TR27 insulated roof panels online directly from Insulation Wholesale. We sell a wide range of Kingspan TR27 PIR boards in multiple thicknesses that fit flat roof insulation work. We offer trade pricing and fast dispatch for UK-wide delivery.

What is the installation process for TR27 insulated roof panels?

To install TR27 boards systematically beneath your waterproof layer:

Prepare the deck 

Ensure the roof deck is clean, dry, and smooth. Any irregularities can cause problems later.

Fix a vapour control layer (VCL) if required

Check the design notes. Some flat roof systems require a VCL on warm roofs to keep moisture from moving into the insulation. VCL use depends on roof build-up and internal humidity.

Lay out the TR27 boards

Position the PIR boards butt tight (edges touching) across the roof area. Start at one corner and keep rows straight. Boards typically come 1200 × 1200mm.

Fasten or bond the board

The fixing method depends on the waterproofing system. TR27 boards are typically:

• Mechanically fixed – Use approved insulation fasteners through the boards into the deck, following the membrane manufacturer’s fixing pattern.
• Bonded – Use system-approved PU adhesive to bond boards where specified.
• Loose-laid with ballast, depending on the membrane spec.

Check board levels

Confirm boards are level and fully supported, with all edges aligned. Uneven boards can cause ponding later.

Seal joints if required

Taping joints is not always required for TR27. Use compatible tape at board edges where required by the roof specification or membrane manufacturer.

Apply a waterproof layer

Once the boards are secure, install your waterproofing system (single-ply membrane, liquid-applied, mastic asphalt) over the insulation.

What are the main brands offering TR27 type insulated roof panels?

In the UK market, the major brands supplying TR27-style flat roof insulation boards are:

• Kingspan (Thermaroof TR27) – Only Kingspan makes “TR27”, the PIR flat roof board with fibre-free core and coated glass tissue facings.
• Recticel (Powerdeck F / Powerdeck U) – Comparable PIR insulation boards that match TR27 thermal and mechanical performance.
• Ecotherm (Inno-Bond) – PIR flat roof boards designed for bonded and mechanically fixed systems. Manufactured to similar TR27 performance levels and often interchangeable in spec.

These product lines deliver rigid PIR insulation with low thermal conductivity (~0.024–0.027 W/m·K) and good compressive strength for flat roof conditions.