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Find Local Roofers In Your Area Now! - 
Roof trusses are frames made up of timber that is nailed, bolted or pegged together to form structurally interdependent shapes of great strength. Never remove, modify or cut into a roof truss without consulting a Structural Engineer: your roof could fall down!
Roof trusses have to withstand the weight of the roof timbers and coverings (the ‘Dead Load’), plus a factor for your local Wind Load, plus a factor for your local Snow Load, plus a Safety Factor. A Structural Engineer can check these figures - Property Repair Systems offers an independent, qualified Structural Calculation service, if you need to modify or repair your roof.
Roof trusses come in all shapes and sizes to suit almost every single design of roof. If you cannot find the truss you need below you may need to find a good carpenter to build a traditional ‘cut’ roof. This means that your roof is made up from timbers on site. If your existing roof trusses are damaged in any way it is possible to repair them without taking your roof to pieces.
The truss depends on three main characteristics, which can be given ‘numbers’ so that a Structural Engineer can calculate a safe load;
- The strength of the timbers – modern trusses are very lightweight, so only structural kiln dried timber is used and it is usually pre-treated, to prevent insect and rot attack;
- The distribution of the load through the parts – the design is critical – if you take one component out, or weaken it (say by cutting notches for pipes) it will be seriously weakened;
- The connection of the parts – the bolts, plates, screws, glue or pegs that hold it all together. These must not be cut or changed without professional advice.
The biggest enemy of roof structures (apart from the notch cutting or hole drilling electrician or plumber) is Water. Penetrating damp – water leaks – these lead to rot and insect attack, even in treated timber, which is not always treated all the way through its thickness. Older buildings are most susceptible, especially where the rafters or tie beams sit on, or in the walls.
Rot and Insect Attack – usually associated with dampness, but mainly in older, pre-Second World war properties, where solid, non-cavity walls or thick random stone walls support the bearing ends of the rafters and/or tie beams. Treatment with Boron based preservatives is essential to stop the rot and insects from destroying the roof’s structural bearings. These potentially damp areas require careful inspection with a torch and prodding with a screwdriver. Drilling with a small diameter Auger is advised, if you have any doubt about the strength of a component.
Joint Failure – modern roof structures mostly use ‘nail plates’ or plywood plates fixed with nails, screws and glue. Older roof timbers were connected with Mortise and Tenon joints, plus wooden pegs. These tend to be eaten away by Woodworm and the roof beams then move, opening up the joints. Resin Repair, with Tie Bars and injected resin, can solve this problem.
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Timber Roof Truses | Roof Truss | Timber Roof Trusses - A quick guide to Timber Roof Trusses and a look at the main causes of Roof Truss failure
Timber Roof Truses | Roof Truss | Timber Roof Trusses - A quick guide to Timber Roof Trusses and a look at the main causes of Roof Truss failure
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