Three Layer Felt Roofing Method

Old style flat roofs were often designed with pieces of asphalt felt paper sandwiched between tar.

Three layer felt roofing method.

Showing the method of roll and pour on fixing felt onto a flat roof. These layers are all laid in a half lap manner so all the joints are the furthest away they can be from another joint. The products used today are a 3 layer membrane system applied with the use of a gas gun. Laying the first nailed layer of underlay felt.

Typically it s applied as a 3 layer system usually consisting of a perforated underlay a 2mm underlay layer then thick 4 5mm felt. What is torch on roofing felt torch on roofing or torch down roofing as it is also known is a flat roof covering solution that involves three layers of modified bitumen felt melt welded onto the roof surface and each other with the use of a blowtorch to create an impenetrable waterproof seal. Traditional roll and pour three layer. Fitted using a blowtorch the 3 layer felt roof system benefits from being more stable than the older methods.

This layer is not bonded to the decking so that the decking can move without damaging the felt roof. Installing any gutter drips. The 3 layer felt roof system is also versatile when it comes to appearance. They had a stereotypical belief they were only good enough for your shed or garage.

In these kinds of felt roofs it is possible to fill low spots with two or three layers of felt applied with tar or another bitumen. An extra coating of sand or fine gravel can be added on top to improve the aesthetic appeal. Each of the three layers is laid in a half lap system so any joint in the roof is as far away as possible from another joint. They are no longer laid with hot bitumen and have stone chippings put on top.

Laying the second bonded layer of underlay felt. Showing the method of roll and pour on fixing felt onto a flat roof. Another method for fixing low spots is to apply new roofing plies to the problem spot. Laying roofing felt this is then applied to a fibrous membrane which is typically made of fibreglass polyester or hessian.