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 repair.
This article describes a diy repair project using a site built spreader to straighten sagged roof rafters and decking.
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.
A case in point would be slates being substituted with concrete tiles a very common occurrence nowadays.
As you work you will move back toward the end where your ladder is taking the bucket with you.
With roof spread the ceiling joists normally act as collars restraining the rafters from pushing the walls outwards so new collars may need to be installed or tie rods inserted through the upper walls.
The collar ties are used in a similar way.
Roof spread is often caused by the roof timbers being subjected to extra weight weight that they were not designed for.
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.
Roof rafter decking sagging.
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.
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.
Roof patching compound generic term for both coatings and trowel on or caulk gun applied roof repair products.
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.
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.
Rotten timbers can be cut out and new timbers spliced alongside or bolted with metal plates.
Tar the roof keep your tar bucket close to you as you start spreading the tar on the surface with the roller.
Use small amounts and apply it with the roller in short smooth strokes.
The tie beams are fixed to the rafters horizontally to stop them from spreading.
This will ensure that any repairs or modifications undertaken will not harm the existing structure.
