Roofing Felt Paper Overlap

Roofing felt or tar paper is infused with a petroleum based solution to provide an additional layer of roof protection under shingles.

Roofing felt paper overlap.

The roof felts are asphalt saturated and are manufactured with a high grade organic mat. 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 age. Remember to always overlap roof paper at valley ridges and hips by six inches. For a flat roof the same applies start at the lower end first working to the higher end and this should resemble tiles on a roof.

It also acts as a layer of insulation and water protection underneath roof shingles. Although tar paper has traditionally been the standard undercoating for shingles as of 2010 synthetics are becoming more popular as an underlayment. Install the roofing felt on all roof sides extending it over the ridge of the roof and overlapping 8 inches there just as you did on the sides. The drip edge should extend at least 2 inches on the roof.

Do the other side of the roof the same way also with an overlap at the peak. Adjacent pieces of drip edge should overlap at least 2 inches 51 mm. Roofing felt is required to overlap 2 inches over the lower felt course. Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest.

Atlas roofing provides a complete selection of roofing felt underlayment. 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. The roofing felt should be applied in layers that overlap. Felt roof underlayment 30 saturated roof felt.

Hence this is why tiles are fitted on top of each other rather than sideways. As you work the paper can be tacked down in the center so it won t blow away. The overlapping felt creates a secondary barrier for moisture and wicks water away from the shingles above and the sheathing below. The last layer should go over both sides of the roof overlapping both side covered in felt.

Tip the roof ridge is the horizontal top edge which may or may not be present on a hip roof. 30 saturated felt underlayment is specified for use as an underlayment between the roof deck and the shingles.