Flat Roof How Many Layers Of Felt

However in almost all areas it is not acceptable to install more than two layers of roofing on any commercial building.

Flat roof how many layers of felt. Some roofing felts are actually glued down. Roofing felt is one of the oldest available options and advances made in the past decade or so have begun to move more towards the torch on approach. For many years it was acceptable to put even the third layer. How to lay a felt roof using cold adhesives a guide to installation a flat roof using three layers of roofing felt with cold adhesive.

Felt roofing is a very common material used on flat roofs such as garages garden sheds and on extensions. A layer of roof felt is laid down and hot asphalt is mopped overtop repeat for two to four layers called plies repair involves reapplication of original materials and or roofing cement to fix cracks or leaks. There are many different types of flat roofing systems available each one with their own pros and cons. On roof slopes of 2 12 to 4 12 the remainder of the roof shall be two layers of 15 felt applied in shingle fashion or 1 layer of ice dam protection.

You wan walk over the roof to remove any air bubbles that may form. Before adding the second layer though spread a thin layer of adhesive on the first layer using your trowel. This will help the two layers adhere to each other. There needs to be an overlap in the felt to help increase the water tight quality.

On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing. The key to weatherproofing your flat roof is adding a total of 3 layers. These applications are ideal for flat roofs or protective surfaces under roof level decks. These thick layers of roofing felt are installed by heating the back of the felt with a butane torch and then carefully applying it to the roof.

Installing the roofing felt does take care but can go very quickly. It must be installed the full length of all valleys. Paint a thin layer of adhesive over the first felt layer. On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt.

Thus you will repeat the earlier steps. You will be placing the second layer of felt over this. Align this layer with the bottom of the roof. Snap a chalk line the.

Overlay a second layer of felt 2 to 3 inches and fasten it through the overlay so it secures the top of the felt underneath. Add the second layer.