How To Apply Roofing Felt Paper

Many rolls are pre striped allowing installers to keep a straight line when applying roll strips to the roof side by side.

How to apply roofing felt paper.

All drip edges along roof eaves valley liners and flashing need to be installed before the roof paper layer is laid down. Also called roof felt or builder s felt overlapped tar paper creates a water barrier that is your home s last line of defense against the elements if your shingles are damaged by wind hail or. Start the roof felt at one bottom corner of the roof. 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.

Many builders use standard 15 pound roofing felt. Felt labeled astm 15 meets specific standards and is the norm in many areas. Felt or building paper must be applied to walls properly to be effective. 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.

It is commonly called 15lb paper. Use a 4 inch 10 cm paintbrush or a roller to apply the paint or primer. Laying the felt the roofing felt should be applied in layers that overlap. Drag it gently from one end of the roof to the other east to west or west to east.

Begin at the bottom working in horizontal lines and gradually moving upward. Apply waterproof paint or primer to promote felt attachment. Install pieces in the correct order and make cuts carefully so any moisture can travel downward at all points without slipping under the wrap. The most common size width for rolls of roofing paper is 36 inches.

Roofing felt is comprised of a base made from natural materials such as wood cellulose or synthetic ones such as fiberglass or polyester and then coated or saturated with a protective coating such as bitumen asphalt which repels water but still allows the product to breathe.