Staggered Pitch Roof

The 45 degree roofs seen on a frame houses are 12 in 12 but roofs can be even steeper consider the mansard roofs introduced by french second empire architects in the middle of the 1800s.

Staggered pitch roof.

For example random width and preferably multi colored slates that are 16 inch 18 inch and 20 inch long can be nailed so that the top edges of all of the slates line up with the chalk lines. A fact sheet on roof insulation published by johns manville rs 7386 notes that as much as 8 percent of the thermal efficiency of insulation can be lost through the joints and exposed fasteners of installations that use only a single layer of insulation. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Pitched roofs begin with with slopes greater than 3 in 12.

Although there is no single standard roof pitch used on all sloped roofs factors such as roofing materials and local climate help to determine the appropriate range of pitches for a given building. The staggered approach to installing insulation reduces thermal bridging in the roof assembly. In this scenario the unbraced rafter spans are relatively long the design loads relatively high and the roof pitch relatively shallow. Rafters can be safely staggered across a ridge board in most situations.

Christopher deblois a structural engineer with palmer engineering co. Most manufacturers specify at least a 4 12 roof pitch for installing them meaning for every foot the rafters extend out from the ridge beam they drop down 4 inches. View the ceiling solutions. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.

Another method of installing a staggered butt slate roof is to use slates of different lengths. If i m using asphalt shingles i always protect the sheathing with ice and water shield first pulling it onto the fascia and rake boards and cover it with trim. Sloped faceted staggered and layered installation methods to create inspiring designs stay code compliant. I am framing a gable roof with common rafters attached to a 2x12 non structural ridge board.

Must the rafters on either side of the ridge line up or can they be staggered along the ridge board. I chose a gable roof at a 6 12 pitch with 2x10 rafters spanning 16 feet from exterior walls to a 2x12 ridge board to carry design loads of 30 pounds per square foot psf live load and 15 psf dead load.