Split Pitch Roof

Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

Split pitch roof.

Managing a hip roof with two different pitches. It may consist of a flat roof on top but the main design element is the multi pitch sloped in what is essentially a hip roof on top of another hip frame. We measured from the ridge to the sleepers to get the lengths of the jacks and then cut them and fastened them into place. It is often compared to slope but is not exactly the same.

To maintain a consistant ridge height in these situations the roof pitch must be adjusted. Near the top is a very steep pitch and near the upper walls of the home are a lower pitch though still fairly steep. 3 12 and 6 12 is 4 5 17. The irregular split pitch hip i am attempting has a fixed main roof pitch of 8 12 and a subordinate pitch of 6 34 12.

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. For instance a 7 12 roof pitch means that the roof rises 7 inches. If the h v rafters are not backed the h v rafters should not be equally split from the hip valley line in plan view. I have only built one roof where a hip was joining two different pitch roofs at the corner of a house.

I was taught to split the different pitches thus coming up with the hip pitch. How roof pitch determines suitable roofing systems. Another by product of this roof configuration is varying soffit heights and widths which require further design decisions. My question is do i add or subtract from the suborcinate sill plate height to equalize the fascia line and in what direction isthe subordinate plane shifted to equalize the overhangs.

In some cases people will choose to install the outdoor unit up on their roof to keep it out of site. To let the jacks sit plumb on top of the sleepers we angled the level cuts to the 3 1 2 in 12 pitch of the shed roof setting the circular saw to a 16 degree bevel the degree equivalent of a 3 1 2 in 12 pitch. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Installing a split system on a pitched roof.

In this installation it was decided because most of the house had decking around it that was used alot for entertaining and the back side of the house didn t have. Flat and nearly flat roofs a pitch of 1 in 12 or 2 in 12 cannot be covered with shingles or shakes of any material since there is not enough angle to combat the danger of blow off.