How To Measure Roof Truss Size

Already having the rise will make it easy to determine the rafter length by loading the numbers into the equation chart.

How to measure roof truss size.

Obtain the height of the gable by finding the difference in height between the top of the roof and the top of the structure. Outside of the u s a degree angle is typically used. Simply input the surface area of the roof choose from one of the available options and you will get your first roofing estimate. Divide the length of the roof by two to determine how many trusses are needed.

Pull a tape measure along the top plate of the house to determine the length of. Converting that to feet and inches the length of the top chord is 10 feet 3 16 inch. Use a level square and measuring tape. How to measure roof trusses.

Trusses are generally secured 24. 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. 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.

This sizing guide for roof rafters will help determine what you need for your small project. Get the width of the structure you want to roof by measuring across the tops of the walls. Set two ladders at each end of the area to be measured. Check that your footage measurements are within this range so you can start off on the right foot.

Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter. For example h sqrt 3 167 2 9 5 2 10 014 feet. Measure out 5 to 6 trusses at a time. There are several variables to consider when determining the proper rafter size.

These are the base boards of your roof truss. Divide this number by 2. The truss is a framework consisting of rafters posts and struts which supports your roof. 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.

For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. C rafter length. 8 inches and you have an 8 in 12 pitch. If this distance measures 4 inches you have a 4 in 12 pitch.

Next you will need to use a roofing materials calculator. Equation a2 b2 c2. Pitch measurement method 2 2.