Design

Trusses are designed in accordance with the current code of practice, which is BS 5268: Part 3, and the relevant building regulations.

Spans

We can design and manufacture trusses with a span of up to 12 metres depending on the size of any overhangs. Trusses requiring spans greater than this can be designed and are supplied as multiple trusses to be fixed together on site.

Heights

We can manufacture trusses up to 3.7 metres but if you require trusses larger than this, two-part trusses could be designed e.g. Attic or Room in Roof trusses which require large room sizes can be top hatted.

Pitches

It is more economical to standardise the range of pitches between 15 and 40 degrees, however, trusses may be supplied outside this range. Care should be taken when specifying because deflection problems may arise with e.g. very shalow pitches. The pitch also depends on the loadings e.g. tile/slate loads and snow loads.

Eaves Overhangs

Any overhang can be supplied to suit the customer’s requirements, a standard overhang is around 450mm. NB. Very large overhangs may cause the trusses to be uneconomical.

Spacing

Trusses are usually spaced at 600mm, but can also be positioned at 450mm or 400mm to support heavier loads. Truss spacing also depends on the loadings, the heavier the load the less spacing between trusses there is.

Timber

We use TR26 grade softwood which is kiln dried and stress graded, and which complies with current European and British Standard BSEN519.

We are fully committed to ensuring that where felling takes place, replanting is undertaken to ensure the continuity of our raw material, together with the provision of living forests for future generations to enjoy.

Preservation

Trusses may be treated with a water-based microemulsion industrial preservative which is a dual purpose fungicidal and insecticidal formulation. Due to the fact we don’t have our own treatment plant trusses will only be treated if requested.

Nailplates

We use Wolf 101 nailplates which are precision punched 1mm thick metal plates with integral teeth and are manufactured from structural grade galvanised mild steel to BS EN10326 Fe E 280 GZ275. Also available and often specified for splice joints are the Wolf 126 nailplates in 1.25mm thick galvanised mild steel.

Wolf101 & wolf126 have been tested to EN1075 and therefore comply with BS EN 14250.

They carry a unique 60 year performance warranty and are covered by certificate No.89/2290 issued by the British Board of Agreement