The collar ties are used in a similar way.
Roof spread repair.
Roof rafter decking sagging.
This is a prolonged process but can cause severe damage to the integrity of a home.
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.
Use small amounts and apply it with the roller in short smooth strokes.
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.
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.
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.
The tie beams are fixed to the rafters horizontally to stop them from spreading.
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.
This will ensure that any repairs or modifications undertaken will not harm the existing structure.
Roof spread is often caused by the roof timbers being subjected to extra weight weight that they were not designed for.
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.
Either the roof starts moving downwards or the walls start pushing outwards.
As you work you will move back toward the end where your ladder is taking the bucket with you.
Tar the roof keep your tar bucket close to you as you start spreading the tar on the surface with the roller.
It has roof spread and to remedy it will mean a major expense possibly even taking the roof off.
Rotten timbers can be cut out and new timbers spliced alongside or bolted with metal plates.
Roof patching compound generic term for both coatings and trowel on or caulk gun applied roof repair products.
Collar ties and tie beams are both construction fixes that can be installed in a roof frame to help stop or solve roof spread issues.
This article describes a diy repair project using a site built spreader to straighten sagged roof rafters and decking.
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.
