Replacing Rotten Roof Timbers

Wood rotting from the inside out compromises the structural integrity of the rafter.

Replacing rotten roof timbers. When repair is no longer an option the roof rafters must be replaced. A new piece of timber is cut a to replace the damaged piece and the joists plates are positioned ether side of the joists with the end of the joist plate right up against the edge of the timber so it is the joist plate that site on the bearer a. You can mold and shape it to match the original wood profile. Replacing a dry rotted beam is not a difficult task if you follow the tried and true methods listed below.

The rotten timber should be removed first and the end of the joist treating to discourage any further rot. If not climb the roof and measure the opening so you can cut the replacement piece to be a perfect fit. This project requires two parts. Wood beams are used to support a bearing load from a roof or second floor.

Inspect and assess the damaged section of timber and determine where it needs to be cut to prop the timber along it s length using suitably sturdy props such as acro props once supported cut off the damaged end leaving only solid un damaged timber now. Not only is this faster but the fixed wood is stronger than the original. It takes paint well and won t rot. Use a polyester filler to rebuild rotted or damaged wood.

If you were able to keep the removed section in one piece measure it. The joist plate is bolted to the timber making the joint b as strong as the original joist. Replace the roof decking select plywood or oriented strand board that is the same thickness as the wood you are replacing. When you come across rotted wood in your old house projects instead of replacing the damaged wood you also can repair it with specialty epoxy penetrants also called consolidants and fillers to make repairs.

The basics of the process are as follows. The length also reduces the fulcrum effect so there shouldn t be any great stresses applied to the existing timber. These plates are a quick and neat solution for joist ends that aren t going to be seen. First remove the rotten wood and then replace it with new rafters.

If the damaged area is fairly small it can be cut away and a new piece of timber joined to that remaining. If wet rot occurs in structural timbers such as roof trusses floor joists expert advice should be sought as the implication for structural integrity must be established. They can span as much as 20 feet and many times they can be doubled as decorative pieces.