You should put a truss over every second joist.
Garage pitched roof construction.
The simplest way to replace the flat garage roof with a pitched roof is to use prefabricated roof trusses.
Measure the width of the garage to know how long you need them to be and count how many joists there are along the length.
Minor repairs had been made over the last 3 or 4 years to repair rotten chipboard.
This shows the existing extension fitted with a flat roof which was probably in excess of 20 years old.
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In the end most of the front view of the roof had rotted away which resembled the bottom of a rabbit s cage.
Start by putting a truss at the front end of the garage.
Medium pitched roofs most roofs in america follow these dimensions where pitch range is kept between 3 to 7 1 2.