Framing A Low Pitch Roof

Pitch is the amount of angle or slope the roof has.

Framing a low pitch roof.

On the body of the square the longer side input the 12 and input the 7 on the tongue the shorter side of the square by lining up the stair gauges at the corresponding point on the square. Input the pitch of the roof that you calculated above we ll use 7 12 for reference throughout on the framing square. Use prefabricated mono trusses for the easiest and best framing on a single slope roof. Or if you want to raise the roof a bit more install fascia around the roof perimeter attached to the new soffit and nail the new roof deck to crown molding above the fascia.

Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes. There are several variables to consider when determining the proper rafter size. Measure the outline of. Erect one truss in.

Metal panel roof systems for low pitch application this system uses a structural metal panel for low pitched metal roofs due to their ability to form a formidable barrier for water. For lower pitches a built up or continuous roll roofing must be applied to keep the roof waterproof. How to frame a single slope roof step 1. This sizing guide for roof rafters will help determine what you need for your small project.

Get on a ladder with a tape measure. For our 4 x8 lean to example using a 2 4 rafter the depth of the birdsmouth is limited by the 1 3 depth of the rafter rule. This is denoted two ways a 1 3 or 1 4 pitch in fractions and a 6 12 pitch in inches which means the roof rises 6 inches for each 12 inches of run. This system can also be used for the steep roofs.

For a low slope residential roof there are two main options. Then apply standard asphalt shingles over the membrane. 1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products. The membrane will outlast the shingles and seal around all nail penetrations.

Sunday august 5 2018 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. Mark truss locations on the front and back wall caps of the structure. Self adhesive flashing membrane under the shingles prevents leakage on low slope roofs. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter.

At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. Use a framing square to help lay out the notch based on the slope of the roof. A 2 4 wall with a 2 6 rafter can be notched for a 4 seat.