Breathable felts

Breathable felt allows moisture to escape the habitants below, creating a protective barrier behind the roofing tiles. 

Before purchasing the breathable felt, ensuring it is BBA approved is essential. The BBA certificate ensures the building product is tested & approved for suitability for your project construction. A common acronym you will find is the GSM. The GSM stands for grams per square metre, which correlates with the higher 'GSM' typically equated to a better quality of breathable roofing felt.

JJ Roofing Supplies stocks breathable felt in both 1 metre x 50 metres (50 metres squared) and 1.5 metres x 50 metres (75 metres squared) felt for your larger roofing projects. When installing breathable felt, it is essential to be aware the felt requires an overlap of 1 – 2cm on the joints. In addition, when installed, breathable felt should have a slight sag which allows water ingress to drain down the roof's pitch into the guttering below. Given the joint overlapping and sagging JJ Roofing Supplies recommends when purchasing your breathable felt to allow 10% extra than the pitch roof's square meterage total.

Before purchasing the breathable felt, ensuring it is BBA approved is essential. The BBA certificate ensures the building product is tested & approved for suitability for your project construction. A common acronym you will find is the GSM. The GSM stands for grams per square metre, which correlates with the higher 'GSM' typically equated to a better quality of breathable roofing felt.

JJ Roofing Supplies stocks breathable felt in both 1 metre x 50 metres (50 metres squared) and 1.5 metres x 50 metres (75 metres squared) felt for your larger roofing projects. When installing breathable felt, it is essential to be aware the felt requires an overlap of 1 – 2cm on the joints. In addition, when installed, breathable felt should have a slight sag which allows water ingress to drain down the roof's pitch into the guttering below. Given the joint overlapping and sagging JJ Roofing Supplies recommends when purchasing your breathable felt to allow 10% extra than the pitch roof's square meterage total.