Double Felting Low Pitch Roof

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.

Double felting low pitch roof.

Page 1 of 2 1 2 next. Discussion in builders talk started by mudhut sep 28 2006. Start with a 19 inch strip of 15 lb. Align this layer with the bottom of the roof.

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. Roofing at low pitches counterbattens fixed to protect nail tape at the top of the rafters and nail tape over the rafters and other fixing points we all know that roofs are pitched to enable water to run off safely to the gutters without pooling and getting into the building structure. But if you want to use felt paper you need to take additional steps. Roll roofing is different.

How to install roll roofing on low slope roofs. Building control sep 28 2006 2. 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. 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.

The double felt solution has proven to be particularly useful for small roof areas which would be expected to discharge only a limited amount of rainfall. Can metal roofing be used on a low slope pitch roof. The roof is low enough slope that double coverage would have made sense. Understandably the double felt method has been implemented widely within the industry to overcome low pitch problems.

Sunday august 5 2018. Even flat roofs have a pitch albeit a slight one. 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. 21 degrees is a bit low for a slate roof i would contact the felt manufacturer for advice some are ok some are not.

In your cold climate with the possible danger of ice dams a bituminous membrane should suffice. 21 degree pitch double felting. Snap a chalk line the.