How To Measure Up For Roof Trusses

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.

How to measure up for roof trusses. Already having the rise will make it easy to determine the rafter length by loading the numbers into the equation chart. Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters. Pull a tape measure along the top plate of the house to determine the length of. Divide the length of the roof by two to determine how many trusses are needed.

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. Set two ladders at each end of the area to be measured. Equation a2 b2 c2. Pitch measurement method 1.

Divide the length of the roof by two to determine how many trusses are needed. For a 9 m 30 foot long roof a total of 15 trusses are needed. 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. 8 inches and you have an 8 in 12 pitch.

For example if the pitch is 4 and the span is 9 feet 6 inches r 4 9 5 12 3 167 feet. Overall span wall to wall bottom chord length if different than the wall to wall span overhang length. Step 1 find the total rise of the roof using the formula r ps 12 where r is the rise p is the pitch and s is the span. Hammer a nail in place to hook your measuring tape and space out the subsequent trusses every 2 feet or other designated spacing.

Starting at one end of the roof mark the first truss flush with the outside edge of a cap plate. Converting that to feet and inches the rise is 3 feet 2 inches. Trusses are generally secured 24. C rafter length.

In order to match up to an existing building there s a couple different measurements that are needed so that you will end up with a matching roof addition. Use a level square and measuring tape. Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters. Measure out 5 to 6 trusses at a time.

If this distance measures 4 inches you have a 4 in 12 pitch.