How To Lay Roofing Felt On A Flat Roof

The two main methods of its application are pour roll and torch on.

How to lay roofing felt on a flat roof.

Laying roofing felt this is then applied to a fibrous membrane which is typically made of fibreglass polyester or hessian. Laying the first nailed layer of underlay felt. Before laying roof felt all rotten decking must be replaced. After this lines should be snapped every 34 as you move up the roof.

Start the roof felt at one bottom corner of the roof. Once you get to the edge of the roof or when the roll runs out start nailing the felt. Step by step guide for felting a flat roof. Drip edges on the eaves any valley liners and all flashing should be installed before the tar paper is laid.

Step 1 prep work. Start rolling the first layer of felt out from the bottom of one side of the roof. The sequence of laying a felt roof is. Laying the top bonded layer of top sheet felt.

Step 2 placing the felt. An extra coating of sand or fine gravel can be added on top to improve the aesthetic appeal. Chalk lines should be snapped 33 5 8 above the eave line. Roll it out along the edge keeping a three inch overhang.

As you roll it out make sure that it remains flat. This layer is not bonded to the decking so that the decking can move without damaging the felt roof. Repeat until roof is covered. Begin laying out your roofing felt by starting at one corner.

Afterward roll the felt away from you lengthwise along the lower edge about 10 feet 120 in. Laying the second bonded layer of underlay felt. Tack it in place at the corner with the end flush with the end of the roof and the bottom edge of the roll right along the bottom of the roof. You can either measure the roof from the ground or by standing on a ladder and actually going up on the roof.

Check to ensure the roof is in good enough condition to walk over. You will be looking for any decking that has rotted or bowed. Lay down felt and secure to roof. Begin at the bottom right or bottom left of the roof.