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Mechanically Fixed Single Ply Insulation Boards

Xtratherm FR/ALU Flat Roof Insulation Board - 125mm x 2400mm x 1200mm. Mechanically Fixed Single Ply

Xtratherm FR/ALU Flat Roof Insulation Board - 125mm x 2400mm x 1200mm. Mechanically Fixed Single Ply

£200.10 £240.12 (inc. VAT)
Stock Status: Sold Out
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Sorry, this item is currently out of stock. You can still Purchase the item and we will inform you when the item is ready to collect or deliver.

Xtratherm FR/ALU Flat Roof Insulation Board

125mm Thick x 2400mm x 1200mm - Foil Faced Flat Roof Insulation Board

3 Boards/8.64M2 Per Pack - Suitable for Mechanically Fixed Single Ply Membrane Roof Systems.

*** Sold & Priced in Pack Quantities Only ***

Xtratherm FR/ALU is a high performance Polyisocyanurate flat roof insulation with vapour-tight aluminium foil facings suitable for use with single ply membranes. FR/ALU is part of the comprehensive range of Xtratherm’s high performance flat roof boards providing total solutions for flat roof projects.

Xtratherm FR/ALU is faced with gas-tight foil. Xtratherm FR/ALU foil faced roof boards are suitable for use below single ply mechanically fixed roof membranes.

Note: FR/ALU is not suitable for applications with built-up bitumen based roofing or mastic asphalt systems.

Xtratherm FR/ALU insulation boards should be laid over the vapour control layer in a break bonded pattern. The long edges of the boards should be laid at right angles to the corrugations and all board joints must be fully supported by the deck. The FR/ALU insulation boards are secured by approved mechanical fixings. The requirement for a separate water vapour control layer should be assessed in accordance with BS 6229. Typically a 1000 gauge polythene should be used with all joints lapped and sealed. Any fixings that penetrate it must be of the self sealing type that fuses to the vapour control layer during application.

Xtratherm FR/ALU foil faced insulation boards are suitable for use on roof decks that are subject to maintenance traffic. Walk ways should be provided on roofs requiring regular pedestrian access. When the roof is complete, protective boarding should be laid if additional site work is to be carried out. The completed roof should not be used for storage of heavy materials or air conditioning plant. 

Vapour Control Layer: The water vapour control layer should be laid with 150mm laps, which are turned up at any vertical upstand. When the insulation boards have been positioned the laps are turned over and sealed, prior to the roof finish being completed.

Laying (Metal/Timber Deck): Xtratherm FR/ALU foil faced boards should be laid over the vapour control layer in a break bonded pattern. The long edges of the boards should be laid at right angles to the corrugations and all board joints must be fully supported by the deck. The FR/ALU insulation boards are generally secured by approved mechanical fixings.

Laying (Concrete Deck): Xtratherm FR/ALU boards are laid over the vapour control layer in a break bonded pattern and secured with approved mechanical fixings, or secured under a ballasted system. 

Care should be taken to ensure that the concrete deck is graded to the correct falls, dry, clean and free from any projections or gaps.

Fixing: The specification for fixing Xtratherm roof boards will vary with the location, roof height/area and topographical data. Architectural specification should be consulted. Generally with 2400mm x 1200mm boards, a minimum of 6 fixings are adequate, located between 50mm and 150mm from all edges, additional fixings may be placed along the centre line. Additional fixings around roof perimeter may be required. 11 fixings per 2400mm x 1200mm sheet is recommended. Counter sunk washers, 50mm in diameter should be used with each fixing. However, BS 6399: Part 2 should always be consulted. During the construction process, the construction should be protected from rain penetration during breaks in the process.

Typical U-Values
FR/ALU Over Concrete Deck
FR/ALU (mm) U-Value (W/m²K)
80mm 0.26
90mm 0.23
100mm 0.21
120mm 0.18
140mm 0.16

Brochure

BBA Certificate

Flat Roofing Guide

*** This Board Type is a Standard Stock Item at our Yard, but not all thicknesses ***

There are difficulties in obtaining this product currently. stock is changing on a daily basis and we always try to reflect this in the stock shown as available here. Sometimes there are some differences. We will confirm availability shortly after your order is placed or you can contact us to discuss this. 

If you require a large amount then please do get in touch as we can supply you with a quotation for a manufacturer direct to site delivery option and further discounts could be applicable.

If you order Stocked and Non-stocked products at the same time this will lead to the non-stocked items having to be delivered into our yard prior to us getting them out to you or you are collecting them from us. The non-stock items have a quicker and cheaper delivery option which is to be delivered direct by the manufacturer. This option may not be available to you if you mix the two products type in your shopping basket. So, you may have to make two separate purchases to get the best delivery times and costs.

We are constantly updating our items and delivery options and so we aim to provide a more seamless approach very soon

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  • Brand:
    Xtratherm
  • Product Code:
    FR/ALU/125/BD/SP06