How to Fit BreatherQuilt over Rafter

This guide will show you step-by-step how to Insulate BreatherQuilt on the external of pitched roofs. BreatherQuilt is a 2-in-1 Insulating & Breathable Multifoil for use over rafters. This multi-layered Insulation material equates to around 55mm of Rigid PIR Insulation, such as Kingspan and Celotex while only being 7mm thick when installed YBS BreatherQuilt can be used in both new builds and refurbishments. It is also fully LABC & BDA certified for building control.

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 over £100 + VAT)

Method steps

1. Installing BreatherQuilt

Starting at the bottom of the roof, roll BreatherQuilt across the rafters and staple in place. Ensure BreatherQuilt is draped in-between each rafter as opposed to being pulled taught. It is important that a 10mm clear gap is formed at the center of all rafters. The gap required will be between the top layer of BreatherQuilt and installed tile batten.

2. Fixing and Cutting

Ensure BreatherQuilt is stapled at 300mm intervals, using min 14mm deep staples, or nails. BreatherQuilt can be cut with either Multifoil Scissors, or a Cutting Knife. Both the cutting tools, along with a Staple Gun & Staples are available in our Multifoil Fitting Kit.

3. Overlapping

Once the first run of BreatherQuilt is fully fixed, and is draping into the rafters, proceed by using the built in double sided adhesive to seal both layers together. Install the next layer of BreatherQuilt in the same manner as the first. Overlap the first and second layer by 100mm, ensuring the double sided tape is secure and sealed.

4. Vertical Joints

Where 2 layers of BreatherQuilt meet on vertical sections, we advise these layers to be butt jointed, not overlapped. These joints should be taped over with ThermaSeal Weatherproof Tape

5. Final Detailing

At the eaves BreatherQuilt should extend onto a suitable eaves carrier. Proceed with tile/slate battens and tile/slates.

Disclaimer - Ecohome-Insulation cannot be held responsible for any losses financially or physically from advice provided in this How-To-Guide. Installation of BreatherQuilt Insulation for under rafter should be in harmony with the official certificate. Recommended fixing materials and good building practice should also be used. Please note this guide is based in the Draped detail. Please visit the BreatherQuilt Data Sheet for the Counter Batten detail.