UKFR - ROOFING AND INSULATION SPECIALISTS

Warm Deck Flat Roofing

Ensure your warm deck flat roof lasts with proper installation. Our page streamlines the process, listing products in order and offering expert insights at each stage.The process begins from the lower deck of the roof and encompasses Vapour Barriers, Flat Roof Insulation, Warm Deck Insulation Fixings, Waterproofing Layers, and the essential tools for installing a top-performing warm deck roof.

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Step One - Vapour Barriers For Warm Flat Roofs

The first crucial element of a warm deck flat roof is the vapour barrier which is adhered to the subdeck. This must be an approved, high quality vapour barrier to prevent rot and eventual roof failure. See our top quality vapour barriers for warm flat roofs below.

Correctly installing a high-quality vapour barrier for warm flat roofs is crucial. Without it, your warm deck roof risks failure! The vapour barrier prevents the internal warm, moist air from condensing on the flat roof insulation layer. Without the vapour barrier, condensation would eventually cause dampness and rot in the warm deck roof and joists. One of the primary causes of flat roof failure is either the absence of a vapour barrier layer or incorrect installation, whether in cold deck or warm deck flat roofs.

• ALUTRIX 600 - A premium quality, self adhesive vapour barrier from Carlisle Construction Materials, a trusted lead manufacturer of flat roof waterproofing. ALUTRIX is installed to the deck using FG35 Primer to ensure a durable fix. With its foil facing and bitumen backing, ALUTRIX offers versatility.
• ELOTENE DSN - A high quality vapour barrier with the same composition & properties as ALUTRIX. Manufactured by Instar, ELOTENE is an excellent alternative product to ALUTRIX. Installed with ELOTENE Primer for a secure fix.

Both vapour barriers can be adhered to using an insulation adhesive such as Insta-Stik for use with tissue faced insulation or mechanically fixed with thermally broken fixings for use with foil faced insulation. 

What sets ALUTRIX and ELOTENE apart is their innovative bitumen backings, which self-heals around screws during installation. This ensures the vapour barrier remains uncompromised, unlike many other vapour barriers on the market. Don't settle for less—choose ALUTRIX or ELOTENE for superior moisture protection.
 

Step Two - Flat Roof Insulation For Warm Deck Roofs

Once the vapour barrier is installed, a flat roof insulation system will need to be installed above. When insulating a flat roof, it is essential that an approved flat roof insulation board is used to prevent flat roof failure. See our approved flat roof insulation boards below.

Installing an approved flat roof insulation board is crucial to the longevity of your warm deck flat roof. Although these boards have PIR cores, they feature a higher compression ratio than standard PIR boards making them suitable for insulating a flat roof. Avoiding standard PIR insulation boards in a flat roof build up is crucial in preventing flat roof failure.

• Rockwool Hardrock - The Ultimate Flat Roof Insulation Board. Rockwool Hardrock achieves an impressive A2 Euroclass Fire Rating whilst also excelling in sound absorption and thermal properties. This board is mechanically fixed to the roof deck using thermally broken fixings. Versatile in application, Rockwool Hardrock can be adhered to single-ply membranes such as EPDM rubber and is compatible with mechanically fixed systems. It's also suitable for use with torch-applied felts, pour and roll bitumen, and certain GRP & Liquid systems.
• Tissue Faced Insulation - Versatile & easy to install, our tissue faced flat roof insulation boards are an excellent option in your warm deck flat roof. They are easily adhered to the vapour barrier layer below using an insulation adhesive such as INSTA-STIK. Serving many applications, these boards can be adhered to most single ply membranes, such as EPDM, due to their tissue facing. Please check your waterproofing manufacturer guidelines.
• Foil Faced Insulation - Our excellent, thermally efficient foil faced insulation boards are specifically crafted for mechanically fixed flat roofs. Foil faced boards cannot be adhered to and must be mechanically fixed to the subdeck and vapour barrier. For optimal results we recommend installing these with our thermally broken warm deck fixings. These boards can also be used with a timber upper deck allowing for a variety of compatible waterproofing systems.
• Tapered Insulation - Designed to enhance a flat roof’s performance by creating a fall, ensuring efficient water drainage. Whether for refurbished or new flat roofs, these boards come in various options including tissue faced, foil faced and ROCKWOOL tapered for unparalleled performance. For a customised tapered insulation scheme, simply fill out our easy form and let our expert advisors create a bespoke design just for you! 

Step Three - Warm Deck Insulation Fixings & Insulation Adhesive

Properly securing insulation to the warm deck roof vapour barrier layer is crucial for durability. Whether you require insulation adhesive or thermally broken fixings depends on the flat roof insulation installed. See our approved warm deck insulation fixing solutions below.

Correctly securing insulation to the warm deck flat roof is paramount for the roof's longevity. The choice between insulation adhesive or warm deck insulation fixings hinges on the type of flat roof insulation boards selected.

A tissue faced flat roof insulation board can be adhered to the vapour barrier layer using an approved insulation adhesive such as our INSTA-STIK which will ensure a secure fix for years to come. For mechanically fixed systems like Rockwool Hardrock and foil-faced flat roof insulation, use thermally broken fixings to prevent thermal bridging, moisture problems, and eventual rot. Use our warm deck insulation fixings calculator to find the right tube and screw combination for your warm deck flat roof.

• Timber Deck Insulation Fixings - These thermally broken fixings are used when securing your flat roof insulation boards to an 18mm timber subdeck. Timber can be any suitable plywood or OSB boards.
• Steel Deck Insulation Fixings - These thermally broken fixings are used when securing your flat roof insulation boards to a 0.7mm - 1.2mm steel subdeck.
• Concrete Deck Insulation Fixings - These thermally broken fixings are used when securing your flat roof insulation boards to a concrete deck
• Insulation Adhesive - INSTA-STIK insulation adhesive is used to secure a tissue faced flat roof insulation board to a fully bonded vapour barrier layer such as ALUTRIX or ELOTENE.

Step Four - Flat Roof Coverings For Warm Deck Roofs

Following your flat roof insulation board you will need to install a flat roof waterproofing membrane. Your chosen flat roof covering will be dependent on the compatibility to your flat roof insulation board used. See our high quality flat roof coverings below including EPDM Rubber Roofing, GRP fibreglass & Liquid roofing options. 

Choosing the suitable flat roof waterproofing membrane for your warm flat roof construction is crucial for long-lasting performance. That's why we offer a wide range of top-quality flat roof coverings, including EPDM, GRP fibreglass, and liquid roofing options. Unsure which one suits your warm flat roof construction? Don't worry! Contact us, and our expert team will be delighted to assist you in making the perfect choice.

EPDM Rubber Roofing

EPDM warm roof coverings feature unmatched durability & versatility! Protect your warm deck flat roof for years to come with our selection, including ClassicBond, ClassicBond Pro & RESITRIX. They all have BBA Certificates and boast impressive expected lifespans of over 50 years, ensuring long-lasting performance for your warm deck roof!

• ClassicBond EPDM - Tried, trusted & reliable! ClassicBond is a versatile single sheet system that can be installed onto a variety of deck types. Pair it with tissue-faced insulation boards or Rockwool Hardrock using full-contact adhesive. For foil-faced insulation boards on timber decks, a water-based adhesive is suitable. Plus, our large single sheets, up to 9.15m x 30.5m, streamline installation, minimising time spent on joint detailing. 
• RESITRIX EPDM - RESITRIX is one of the most advanced and top rated single ply roofing systems on the market at 2.5mm thick with hot air welded joints. Its self-adhesive bitumen backing and reinforced EPDM hybrid design make it perfect for warm deck flat roofs. Utilising FG35 Primer and a heat gun, RESITRIX can be installed onto a multitude of warm deck roofs including Rockwool Hardrock, tissue-faced insulation boards and timber decks.
  Please Note - For those seeking a mechanical fix system, RESITRIX MB presents an excellent option. It can be utilised with foil-faced and Rockwool Hardrock insulation. Feel free to reach out to our sales team who will be able to help.
• ClassicBond PRO EPDM - ClassicBond PRO sets itself apart as a premium performance fleece-backed solution for a flat roof covering. Utilising pressure sensitive 3-inch joining strips with the easy to handle 1.52m rolls, installation couldn’t be easier. Offering installation adaptability, the ClassicBond PRO can be adhered to timber decks using water based adhesive or to other surfaces such as tissue faced insulation or ROCKWOOL Hardrock using the ClassicBond PRO PU adhesive. 

Liquid Roofing

As the newest roofing system to the market, PU and PMMA systems are becoming an increasingly popular flat roof waterproofing solution due to the easy installation & seamless finish! Our liquid roofing system ARBOFLEX PU boasts a 25 year BBA Certificate.

• ARBOFLEX PU - Combining a 225g matting with the innovative PU liquid, ARBOFLEX creates a durable flat roof covering. Its popularity among professional roofers stems from the inclusion of a UV topcoat, ensuring a durable and UV-stable finish. This liquid roof waterproofing system is easily installed onto a timber deck. However, if you plan to install onto Rockwool Hardrock or tissue faced insulation boards then please contact our sales team as you will need a carrier membrane.
   

GRP Fibreglass Roofing

GRP fibreglass roofing is a well renowned seamless system used by many flat roofers. While it offers durability for warm roof decks, proper installation with thermally broken fixings is crucial. Without them, thermal bridging can lead to deck rot over time, causing screws to puncture the GRP warm roof construction with roof movement. Our thermal broken fixings mitigate this risk by reducing thermal bridging and potential rot. They also feature a telescopic function, allowing for movement without piercing the waterproofing layer. These fixings also minimise excess noise and creaking in flat roofs.

• RES-TEC GRP1010 - From leading manufacturer RES-TEC we have the affordable GRP Roof 1010; A seamless fibreglass roofing system with a lifespan of 20 years. This is an excellent option for your grp warm roof construction when used on a timber OSB3 T&G deck. When using GRP roof 1010 in a mechanically fixed system it is crucial to use thermally broken fixings to prevent flat roof failure. Please Note - It is common to use tape to cover the warm deck tubes to prevent liquid ingress, however if you would like the tube plugs sent out please contact our sales team. 
• RES-TEC FLEXITEC 2020 - As one of the only flexible GRP fibreglass roofing systems on the market, the FLEXITEC 2020 is highly rated amongst roofers. Featuring a seamless finish with easy detailing, this system is ideal for a GRP warm roof construction when installed onto a timber OSB3 T&G deck. Please Note - It is common to use tape to cover the warm deck tubes to prevent liquid ingress, however if you would like the tube plugs sent out please contact our sales team. 
• ResiRoof& CRS GRP fibreglass roof kits - An excellent fibreglass roofing solution on a budget; Offering 10, 15 & 20 year guarantees. Both of these systems are suitable in a GRP warm roof construction when installed onto timber OSB3 T&G boards.

Step Five - Complete Your Warm Deck Flat Roof

Find everything you will need here to complete your successful warm flat roof installation, whether using an EPDM rubber roofing, GRP fibreglass roofing or liquid roofing system.

EPDM Rubber Roofing Accessories For Your Warm Deck Flat Roof

GRP & Liquid Roofing Accessories For Your Warm Deck Flat Roof

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Why Choose UKFR?

UKFR are industry experts in warm deck flat roofing, with over 50 years of experience. Our knowledgeable team is dedicated to ensuring all warm deck flat roof constructions are installed correctly and successfully. Our experienced customer service team are on hand to answer any questions you may have about warm flat roofing. 

Frequently Asked Questions

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