Roof Construction Timber Sizes

Building control guidance note subject ceilings and flat roofs timber sizes and construction details 09 issued 01 04 13 rev page 1 of 2 the following tables give details of the allowable spans and spacing for some of the more common timber sizes used in ceiling and flat roof construction.

Roof construction timber sizes.

We will then discuss the framing square and learn how it s used to solve some basic construction problems. The minimum sizes are 6 x 8 for a column supporting a roof 8 x 8 for a column supporting a floor 6 x 10 for a floor beam 8 x 8 for a roof truss member 4 x 6 for a roof beam 3 1 finish floor decking 2 roof decking according to the. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. Wall plate is the timber wood that are placed on top of blocks or roof beams as the case may apply so for the fastest way to calculate this is to add the entire walls length and divide by 3 6m to know the numbers of pieces you need.

It is still the roof material of choice for housebuilders and self builders irrespective of whether they are building in traditional or contemporary styles or whether they are creating pitched or flat roofs. It builds on knowledge and skills acquired during the first stage which should be revised and practiced throughout the course. But before discussing roof framing we will first review some basic terms and definitions used in roof construction. All the figures are based on roofing tiles or slates laid on timber laths over sarking felt.

Timber has been the traditional material for building roofs as far back as early saxon times and beyond. Maximum clear span of flat roof joists in metres for sc3 timber spacing between joists size of roof joist 400mm 450mm 600mm 47 x 97 1 84 1 81 1 74 47 x 120 2 43 2 39 2 27. For solid timber members in floors ceilings and roofs for dwellings and various companies do online calculation software. More common timber sizes used in flat roof construction.

It s considered heavy timber when. Trada a trade association with a strong reputation for research and publication on all things timber have published span tables in a softback book called eurocode 5 span tables. Roof framing in this chapter we will introduce you to the fundamentals of roof design and construction. All figures are based on.

However for practical purposes the self builder will still find the span tables in the old. Timber roof designing buildings wiki share your construction industry knowledge. Tafe nsw construction transport division 1 timber roof trusses timber roof trusses this text introduces subject matter related to the manufacture and installation of timber roof trusses.