The roof element

Spatial Roof then uses an engineered 'Timber Strand' LSL interface ladder nailed to the top of the timber deck at the eaves positions, this working with the decking to form a girder on each side of the roof between the gables. All of this work is safely done from the sound working deck and using easily manhandled components. The roof structure itself is made of pressed metal plate timber assemblies from the truss rafter factory but, to ensure that these can be safely lifted, they are supplied as two rafter units per truss, each with its own stud for the attic room wall, and an assembly for the ceiling. These are assembled on the floor deck into one attic unit. Whilst the majority of this 'attic' is formed by conventional stress graded soft wood, the stud wall member being highly stressed is formed of Timber Strand LSL engineered timber. A special detail at the base ensures the interface ladder controls the horizontal spread, but allows the floor deck to deflect under load independent of the roof structure. This simple construction is suitable for both the professional builder and the self-build enthusiast because it does not involve the use of cranes or other heavy lifting equipment and allows easy and safe working whilst allowing the contractor to use the very latest timber engineering technology.

The normal rules apply for the trimming of openings both in the roof and the floor diaphragm. Spatial Roof, Timber Strand LSL and Trus Joist Silent Floor are all registered trade marks and copyright of Trus Joist, full details of which can be found in the bibliography.

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