Double Felting Low Pitch Roof

Building control sep 28 2006 2.

Double felting low pitch roof. 21 degrees is a bit low for a slate roof i would contact the felt manufacturer for advice some are ok some are not. It looks as if there s no drip edge at the gable ends of the house so if you need to make a determination for sure your main task is not to fall off the ladder while looking under the shingles at the felt. Can metal roofing be used on a low slope pitch roof. Understandably the double felt method has been implemented widely within the industry to overcome low pitch problems.

Roll roofing is different. It has just one layer so it goes. In your cold climate with the possible danger of ice dams a bituminous membrane should suffice. 21 degree pitch double felting.

The arma s residential manual for asphalt roofing recommends that asphalt shingles on low slope roofs be applied over a nonperforated single layer of adhesive backed bituminous membrane installed to the manufacturer s specifications or over a double layer of asphalt impregnated felt paper. But if you want to use felt paper you need to take additional steps. Asphalt saturated felt along the eaves and lap succeeding courses by 19 inches as shown in figure 2 3. Even flat roofs have a pitch albeit a slight one.

Snap a chalk line the. Discussion in builders talk started by mudhut sep 28 2006. The roof is low enough slope that double coverage would have made sense. Guide to roofing underlayment installation on low slope roofs with asphalt shingles asphalt shingles can be used on roofs with a slope of 2 12 to 4 12 if double coverage underlayment is used.

The traditional metal roof types such as 5v crimp shown above and corrugated are rated by the manufacturers for use down to a 3 12 pitch three inches of vertical rise for every foot of horizontal run because of the shallow height of the undulating. Sunday august 5 2018. Overlay a second layer of felt 2 to 3 inches and fasten it through the overlay so it secures the top of the felt underneath. Align this layer with the bottom of the roof.

Start with a 19 inch strip of 15 lb. Page 1 of 2 1 2 next. How to install roll roofing on low slope roofs.