In face you won t be replacing the rafter but adding a support on the side along its length a process known as sistering.
How to remove existing wooden roof rafters from a garage.
Remove the existing roof.
Use a circular saw to cut two sets of new rafters from the same size wood by the same dimensions.
Measure the dimensions of the old rafters beneath your roofing surface.
Repeat the process for the joist beneath your old roof rafter.
Roof trusses are a common means of support and load bearing.
Attic trusses have a rectangular shape inside each truss.
This can seem like a huge job but in fact it s not too difficult.
When taking the roofing materials off be sure to extend the path of demolishing to each existing truss on each side of the damaged one.
Remember any alterations to a roof should be undertaken only with an engineer.
Discard the wood in a garbage bin as you work to make the cleanup easier.
The sad fact is your builder could have installed attic trusses over this garage for just slightly more than what the existing trusses cost.
This can easily be accomplished by using a hammer and a crowbar.
Use your tape measure to record the distance of both rafter legs.
The rotten wood will come away easily.
When you have a problem with a roof rafter in the garage it s important that you immediately take care of it to keep the roof secure.
Remove the rotted wood with a chisel and pry bar.