How to Insulate Your Roof Without Any Kingspan or Celotex

This step-by-step guide shows how to insulate a roof using our Triple Layer System.

Our Triple Layer System is proven to save on cost, space, wastage, and installation time compared to traditional methods such as Kingspan and Celotex.

Both SuperQuilt and BreatherQuilt, included in this system, are fully certified. These certifications include LABC and BDA Kiwa. Multifoil Insulation's Triple Layer System will achieve a minimum U-value of 0.18 on a pitched roof. You are able to retrieve a PDF document displaying the U-value achieved, which can be forwarded to building control. To get a copy of this document, please email us at sales@ecohome-insulation.com.

Ecohome-Insulation are the leading UK & European distributor of Multifoil Insulation products. We offer free next working day delivery to the UK Mainland (on orders placed before 2pm and over £100 + VAT).

Install First Run of BreatherQuilt

Install YBS BreatherQuilt on the external of the pitched roof, ensuring the reflective foil faces internally with the breather membrane facing outwards. Starting at the bottom of the rafters, staple BreatherQuilt to the first rafter using 14mm staples at 300mm intervals, rolling it horizontally across each rafter and stapling continuously.

BreatherQuilt should sag between the rafters rather than being pulled taut. Once the tile battens are installed, there must be a clear 10mm gap between the top layer of BreatherQuilt and the tile battens.

Install Next Run(s) of BreatherQuilt

Install a further layer of BreatherQuilt, overlapping the product by 100mm and sealing using the built-in double-sided tape. Staple as previously and ensure the tape is secured and sealed. Repeat depending on how many runs are required for the roof.

Additional rolls on the verticals should be butt jointed on the rafters, stapled as before, and taped using waterproof tape.

Install Tile Battens and Tiles

At the eaves, BreatherQuilt should extend onto a suitable eaves carrier — this works the same way as standard breather membranes. Install horizontal tile battens on top of the BreatherQuilt, then finish by installing tiles or slates.

Install 2 Layers of SuperQuilt Under Rafter

Both layers of SuperQuilt can now be installed from the internal (underside) of the rafters. The first layer is recessed in between the rafters; the second layer is pulled taut as a flat, continuous layer.

Ensure there is a clear cavity between both layers of SuperQuilt and the BreatherQuilt above.

Recess 1st Layer of SuperQuilt

SuperQuilt is stapled to the underside of the first rafter, then recessed into the rafter by 25mm and fixed with staples or battens. The material is pulled taut and fixed to the opposite rafter, then wrapped around it, stapling regularly as the process repeats along the roof.

SuperQuilt is overlapped by 50mm — ensure it's fully taped and sealed using ThermaSeal Foil Joining Tape over the laps and around the perimeter.

Install 2nd Layer of SuperQuilt

Once the first layer of SuperQuilt is installed, install the second layer by stapling or nailing it through the first layer into the rafters behind, pulled taut so a cavity forms between the two layers.

As with the first layer, overlap the second layer by 50mm and ensure it's fully taped and sealed around the perimeter and overlaps using ThermaSeal Foil Joining Tape.

Internal Finishing

Once both layers are installed and taped, you're ready for your secondary batten and plasterboard. Start by installing 25mm x 38mm battens on the insulation — we advise cross-battening, though vertical battens can be used if preferred.

Finish by installing 12.5mm plasterboard. There is no requirement for foil-backed plasterboard or a separate VCL — SuperQuilt works as a high-performance vapour control layer when taped and sealed using ThermaSeal Foil Tape.

Disclaimer – This guide is based on 100mm rafters at 400mm centres, with access to both the internal and external of a pitched roof. SuperQuilt and BreatherQuilt should be installed in harmony with the manufacturer's certificate, fixing instructions, and good building practice. Our multifoils are to be cut using a craft knife or a sharp pair of scissors, available in our Multifoil Fitting Kit. No personal protective equipment, clothing, or handling is required.

Disclaimer – Ecohome-Insulation cannot be held responsible for any losses financially or physically from advice provided in this How-To-Guide.