Should Roofing Felt Overlap

Since you will have overlap between rows this works out to a total coverage area of 400 square feet the dimensions of a 20 x 20 roof.

Should roofing felt overlap.

Have a helper ready to assist with this step and take care to get the lines straight and clean. Buy the roof felt. Do the other side of the roof the same way also with an overlap at the peak. The drip edge should extend at least 2 inches on the roof.

Chalk lines should be snapped 33 5 8 above the eave line. The last layer should go over both sides of the roof overlapping both side covered in felt. Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest. Roofing felt is required to overlap 2 inches over the lower felt course.

The roofing felt should be applied in layers that overlap. Must be installed at the rakes and eaves of the roof. For an apex roof start at the bottom and lay it horizontal the next should overlap as in video so the water runs over the join as it runs off the roof finishing at the apex or top of roof. Work up the roof to the peak and fold felt over the top overlapping at least 3 inches and fasten it on both sides.

The overlapping felt creates a secondary barrier for moisture and wicks water away from the shingles above and the sheathing below. Adjacent pieces of drip edge should overlap at least 2 inches 51 mm.