Mono Pitch Roof Framing

When a fraction is used it is the rise over the span.

Mono pitch roof framing. For instance a 4 12 pitch denotes. Figure 2 shows both. Most widely designed roof shapes. Pitch can vary a great deal from a shallow slope up to a very steep pitch.

Pitch whether using roof trusses or stick building the roof the pitch of the roof must be selected. Back then local lumberyards stocked mono slope ridge flashing that looked like oversized drip edge. Also in pairs with their high ends abutting on extremely long spans with a. It is also easier to insulate a roof with a greater pitch.

Measure the outline of the structure to be roofed with a tape measure or get dimensions from a house plan. Mike guertin on instagram mike guertin a builder and remodeler in east greenwich r i and a presenter at jlc live responds. The greater the roof s pitch the better it will shed snow ice and rain. Roof pitch is indicated by a fraction 1 3 1 4 etc or slope triangle.

Mono used where the roof is required to slope only in one direction. Pitch also has its own denotation determined by the rise in inches in 12 inches. 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. 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. When a slope triangle is used it is rise over. In this case the highest end of the trusses is considered the ridge line and requires at least two braces over its length. We framed and roofed a number of contemporary homes in the 1970s and 1980s with mono slope aka mono pitch roofs.

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. They differ considerably from the conventional gabled roofs in shape and construction. The minimum roof pitch is 1 8 inch rise per foot of span.

Blind valleys simplify framing. Pitch for a gable roof the most common is generally 1 4 or 1 3. Select an angle of slope away from a house into an area with good drainage and complementary to an existing house or other building. 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.

Which is equal to 1 4 or 1 3 the total span of the building not counting any overhang. Use prefabricated mono trusses for the easiest and best framing on a single slope roof. 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.