This article describes a diy repair project using a site built spreader to straighten sagged roof rafters and decking.
Roof spread repair.
This will ensure that any repairs or modifications undertaken will not harm the existing structure.
Roof rafter decking sagging.
Spreading roof structures turning our attention to roof structures spreading out of the a frame is often indicative of inadequate ties or decay at eaves level.
Roof spread occurs when the downward pressure of the weight of the roof starts pushing against the rafters enough that the structure itself begins to move.
Inserting additional often lower collars tie beams between the trusses or rafters assists greatly in reducing roof spread and this consequently restrains the outward thrust on walls.
The problem of resisting roof spread is a real one and it is always worth checking how roof spread is resisted when carrying out repairs or modifications to a timber framed structure.
The collar ties are used in a similar way.
A case in point would be slates being substituted with concrete tiles a very common occurrence nowadays.
Roof spread is often caused by the roof timbers being subjected to extra weight weight that they were not designed for.
The tie beams are fixed to the rafters horizontally to stop them from spreading.
Roof flashing cement is a dense or thick sealant paste applied by trowel or from a tube used to seal small cracks holes gaps or at intersections of flashing or roofing and other building surfaces.
Roof spread occurs when there is a failure to adequately support the main rafters of the roof so as to prevent them spreading further open in a scissor type action.
This is a prolonged process but can cause severe damage to the integrity of a home.
Use small amounts and apply it with the roller in short smooth strokes.
As you work you will move back toward the end where your ladder is taking the bucket with you.
It has roof spread and to remedy it will mean a major expense possibly even taking the roof off.
Either the roof starts moving downwards or the walls start pushing outwards.
Tar the roof keep your tar bucket close to you as you start spreading the tar on the surface with the roller.
When considering what to do about sags in a roof start by noticing if the sag is in sheathing between rafters page top photo0 or sagging along the length of the rafters.
Since the rafters are fixed to timber wall plates sitting on the head of the masonry wall then roof spread pushed out those wall plates in the process pushing out the masonry below.
Rotten timbers can be cut out and new timbers spliced alongside or bolted with metal plates.
