Overlap On Roof Felt

Overlap the end of a roll about 4 inches with the start of a new roll and fasten both pieces to the.

Overlap on roof felt.

Use a heavy duty felt for long term weatherproofing. Now place the third layer on top. Since you will have overlap. 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.

Felt comes in either 15 pound or 30 pound ratings. A conventional roll of felt is enough for 432 square feet. Ensure that the felt lies flat and smooth before securing it. Roofing felt is required to overlap 2 inches over the lower felt course.

Must be installed at the rakes and eaves of the roof adjacent pieces of drip edge should overlap at least 2 inches 51 mm. Either walk over the felt with your feet to ensure a tight secure fit or pat it down with your trowel. As before you will need to make sure that there are no air bubbles between layers. Once again leave 8 inches of excess at the side of the bottom edge of the felt.

On roof valleys ensure the breather membrane is extended by a minimum of 300mm on each side measured from the centre of the valley. The felt must be flush at the rake side edges have 4 inch overlaps where two pieces are joined and 6 inch overlaps on hips and ridges. Continue along the roof to the other end and trim the felt flush at the end with a utility knife. Position the second row of felt so that it overlaps the first row.

For a more permanent roof coverage use roll roofing. Now you ll use the top line on the first row as a guide for installing the second row. How much should i overlap my felt underlayment on my roof. The process of felting a shed roof step 1.

As you work the paper can be tacked down in the center so it won t blow away. If the roof felt tears cut a piece large enough to cover the tear with lots of overlap slip the top under the next lap. Clean and prepare the. The vertical leg of the drip edge should be at least 1 5 inches wide and extend at least 0 25 inches below the sheathing.

Felt underlayment can overlap more than 2 inches to provide an adequate barrier. The drip edge should extend at least 2 inches on the roof. Tack the roofing felt down with 1 4 staples using an air compressor with a pneumatic stapler a hammer tacker or a staple gun every 12 inches. If there is no ridge ventilation the breather membrane should go over the ridge and overlap each side of the ridge line by the required overlap.

Be sure that there are 2 inches of overlap with the previous layer and that some felt covers the edge of the roof.