Mono Pitch Roof Framing

When a slope triangle is used it is rise over.

Mono pitch roof framing.

They differ considerably from the conventional gabled roofs in shape and construction. Use prefabricated mono trusses for the easiest and best framing on a single slope roof. Pitch whether using roof trusses or stick building the roof the pitch of the roof must be selected. Mike guertin on instagram mike guertin a builder and remodeler in east greenwich r i and a presenter at jlc live responds.

Most widely designed roof shapes. The steeper the roof the more expensive the trusses get because the longer the boards get and the more roof area increases. Which is equal to 1 4 or 1 3 the total span of the building not counting any overhang. And the roof framing consists of trusses or a strutted roof either roof plane or roof space bracing is required in accordance with para graphs 10 3 2 and 10 3 3 for light and heavy roofs see figure 2.

Pitch is the slope of the roof. The greater the roof s pitch the better it will shed snow ice and rain. Also in pairs with their high ends abutting on extremely long spans with a. For instance a 4 12 pitch denotes.

Mono used where the roof is required to slope only in one direction. The total rise is 12 inches or 1 foot and the span is 4 feet so the pitch would be 1 4 or a quarter pitch roof. This is the distance between trusses. Select an angle of slope away from a house into an area with good drainage and complementary to an existing house or other building.

We framed and roofed a number of contemporary homes in the 1970s and 1980s with mono slope aka mono pitch roofs. Using a pitch measuring tool that i d made we also determined that the exact pitch of the shed roof was 3 1 2 in 12. Roof pitch is indicated by a fraction 1 3 1 4 etc or slope triangle. Back then local lumberyards stocked mono slope ridge flashing that looked like oversized drip edge.

Blind valleys simplify framing. When a fraction is used it is the rise over the span. Figure 2 shows both. You will also incur additional costs because it is much harder to deck and shingle a roof that is 12 12 pitch versus a 4 12 roof.

It is also easier to insulate a roof with a greater pitch. While the gabled roof is always pitched in two directions the mono pitch always slants in a single direction. To keep the porch roof framing as simple as possible we installed a structural ridge supported by posts at each end with the common rafters landing on top of the ridge. Pitch depth spans in feet to out of bearing spans in feet to out of bearing 5 12 38 47 57 39 51 59 42 56 63 45 54 68.

In this case the highest end of the trusses is considered the ridge line and requires at least two braces over its length. The minimum roof pitch is 1 8 inch rise per foot of span. The standard roof truss spacing is 2. Mono pitched roofs are also known by the names of skillion roofs shed roofs pent roof and lean to roof.

Measure the outline of the structure to be roofed with a tape measure or get dimensions from a house plan.