How To Apply Roofing Felt Paper

As you work the paper can be tacked down in the center so it won t blow away.

How to apply roofing felt paper.

The most common size width for rolls of roofing paper is 36 inches. Felt or building paper must be applied to walls properly to be effective. Start at the bottom of the roofline and work up so any water that gets through the roofing material will shed down the tar paper and will not go under it. All drip edges along roof eaves valley liners and flashing need to be installed before the roof paper layer is laid down.

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. Apply waterproof paint or primer to promote felt attachment. Before applying roofing you ll need to cover the sheathing with roofing felt also often called tar paper most local codes call for using 30 pound felt. Use a 4 inch 10 cm paintbrush or a roller to apply the paint or primer.

Felt labeled astm 15 meets specific standards and is the norm in many areas. Laying the felt the roofing felt should be applied in layers that overlap. Many rolls are pre striped allowing installers to keep a straight line when applying roll strips to the roof side by side. Some roofers prefer to attach felt underlayment with 1 inch roofing nails or special nails with plastic washers but most codes allow staples which are easier to drive.

Begin at the bottom working in horizontal lines and gradually moving upward. Install pieces in the correct order and make cuts carefully so any moisture can travel downward at all points without slipping under the wrap. It is commonly called 15lb paper. Start the roof felt at one bottom corner of the roof.

Many builders use standard 15 pound roofing felt.