Roofing Felt Paper Overlap

Felt roof underlayment 30 saturated roof felt.

Roofing felt paper overlap.

The roofing felt should be applied in layers that 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. Hence this is why tiles are fitted on top of each other rather than sideways. 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.

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. Roofing felt or tar paper is infused with a petroleum based solution to provide an additional layer of roof protection under shingles. The roof felts are asphalt saturated and are manufactured with a high grade organic mat. Do the other side of the roof the same way also with an overlap at the peak.

30 saturated felt underlayment is specified for use as an underlayment between the roof deck and the shingles. 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 drip edge should extend at least 2 inches on the roof. Atlas roofing provides a complete selection of roofing felt underlayment.

The overlapping felt creates a secondary barrier for moisture and wicks water away from the shingles above and the sheathing below. As you work the paper can be tacked down in the center so it won t blow away. 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. Installing roofing paper or felt is an essential element to construct a waterproof roofing system.

Adjacent pieces of drip edge should overlap at least 2 inches 51 mm. Remember to always overlap roof paper at valley ridges and hips by six inches. Although tar paper has traditionally been the standard undercoating for shingles as of 2010 synthetics are becoming more popular as an underlayment. 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.

Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest. Tip the roof ridge is the horizontal top edge which may or may not be present on a hip roof.