How To Measure Up For Roof Trusses

Starting at one end of the roof mark the first truss flush with the outside edge of a cap plate.

How to measure up for roof trusses.

Pull a tape measure along the top plate of the house to determine the length of. If this distance measures 4 inches you have a 4 in 12 pitch. Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters. For example a roof with a span of 20 ft and a rise of 7 feet needs rafters that are the square root of 400 49 21 2 feet.

Divide the length of the roof by two to determine how many trusses are needed. Converting that to feet and inches the rise is 3 feet 2 inches. For a 9 m 30 foot long roof a total of 15 trusses are needed. Measure out 5 to 6 trusses at a time.

C rafter length. For example if the pitch is 4 and the span is 9 feet 6 inches r 4 9 5 12 3 167 feet. How to measure roof trusses. Equation a2 b2 c2.

On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12 inch mark on the level s bottom straight down to the roof. Before you start cutting you first need to determine how long your roof rafters need to be and the angles at which you ll cut the top and bottom of the rafter. Divide the length of the roof by two to determine how many trusses are needed. Pitch measurement method 1.

Already having the rise will make it easy to determine the rafter length by loading the numbers into the equation chart. Hammer a nail in place to hook your measuring tape and space out the subsequent trusses every 2 feet or other designated spacing. Set two ladders at each end of the area to be measured. Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters.

8 inches and you have an 8 in 12 pitch. Trusses are generally secured 24. Overall span wall to wall bottom chord length if different than the wall to wall span overhang length. Use a tape measure to measure the entire width of your building.

Measure as precisely as possible down to the 1 4 inch 0 64 cm 1 8 inch 0 32 cm or 1 16 inch 0 16 cm.