Roof Truss Timber Sizes

The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction.

Roof truss timber sizes.

Structural calculations for timber joists timber beams glulam beams flitch beams using the latest design codes. 0 524 kn m ceiling dead load. This is the right way to fix truss clips connecting the rafter and. Member size grade tc 1 4 4 7 97 tr26 bc 6 10 72 tr26 bc 10 2 72 tr26 wb 3 8 5.

0 250 kn m ceiling live load 0 250 kn m tank load 0 450 kn max tile batten centres. 600 timber thickness mm. This table is considerably more useful that the one that was in the previous 1990 edition of the regulations as not only maximum truss spans are indicated but also the allowable and recommended pitch of the roof and the member sizes and grades of timber that are specified in sans 1783 2. Standard roof truss general load settings.

All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. 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. 0 785 kn m snow load. A project of this nature would typically cost 982 80 as indicated by our roof truss instant quote estimator below.

Shop our wide selection of stock and custom roof trusses to complete your building project available in a variety of styles and sizes. Imposed loads roof snow load and short term point load altitude not exceeding 100m. Click to add item 26 spreadweb residential roof truss 6 12 pitch 87 to the compare list. Rafters have a tendency to flatten under gravity thrusting outwards on the walls.

Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70. 360 mm general truss information. The truss is a framework consisting of rafters posts and struts which supports your roof. The cost of roof trusses.

0 75 kn m snow load. Pitched roof timber sizes. Automatically calculate suitable rafter sizes enter a specific rafter size 1 3 timber strength. 35 timber size information.

Tr26 grade timber has been a cornerstone product of timber roof truss manufacturing for a number of years and therefore is the only kind of timber that we use and provide for our customers.