Advantages of lightweight trusses.
Cheap, they are very cost effective.
They are thin in thickness, Say 35mm,and use cheap and small sections of timber.
When they are fixed in their correct positions, these floppy weak looking fabrications are transformed into tremendously strong roof structures.
They are made to order, usually at a franchise outlet of the main company.
Each roof is designed from the drawings that the builder or owner provides. The complex engineering calculations are done on proprietary computer programs.
There is no need for anyone on site to do any measuring of degrees or calculating lengths.
The end results are cheaper and more accurate roof frames that are quick to build.
Fixing with all the various brackets and clips etc. can easily be done by anyone who can swing a hammer and use a drill. This makes them a distinct possibility for the average self builder.
Usually a roof truss order will also contain all the ancillary fittings that are needed to complete the roof.
These will include metal ceiling battens, roof battens, purpose made and standard hold down brackets, strap bracing, nail plate connectors etc. Some Disadvantages of lightweight trusses
Lack of design freedom. Invariably this type of roof is built on variations of rectangular plans. No curves and bends.
Certain maximum spans and small maximum unsupported overhangs, compared to steel.
Only a certain range of roof pitches.
Not got the same fire resistance as all steel construction.
Not the same termite resistance as all steel.
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