Timber Roof Joists

Span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3.

Timber roof joists.

Our selection includes treated carcassing to prevent wood deterioration even in damp conditions as well as untreated and premium varieties. Joists are traditionally made from timber. As the name trimjoist indicates our product can be trimmed on the construction site for a custom fit. The truss is a framework consisting of rafters posts and struts which supports your roof.

As the essential unseen support for many buildings timber is a versatile building material you can use for a range of projects. Sawn carcassing timber cls studwork timber carcassing timber batten fencing timber joists. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. No more custom made floor trusses.

These span tables apply only to flat roof and roof with a slope of up to 10 degrees. A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof trusses usually occur at regular intervals linked by longitudinal timbers such as purlins the space between each truss is known as a bay. Roofing roofing timber roof sheets flat roofing roof windows fascia soffit guttering view all. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope. Sheet materials mdf hardboard. They are nominally 2 inches thick actual width usually 1 1 2 inches and come in a variety of widths from 8 to 12 inches. Rafters have a tendency to flatten under gravity thrusting outwards on the walls.

This is the distance between joist centres. Usually 400 450 or 600mm but any value can be used up to 610mm max usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size. Trimjoist is the marriage of an open web floor truss and a trimmable wooden i joist bringing the best features of each to the relationship. Notches are not to exceed 0 125 of the depth of the joist and are to be located between 0 07 and 0 25 of the span from the support.