Roof Truss Timber Sizes

All the figures are based on roofing tiles or slates laid on timber laths over sarking felt.

Roof truss timber sizes. Member size grade tc 1 4 4 7 97 tr26 bc 6 10 72 tr26 bc 10 2 72 tr26 wb 3 8 5. Automatically calculate suitable rafter sizes enter a specific rafter size 1 3 timber strength. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. 0 785 kn m snow load.

Pitched roof timber sizes. 600 timber thickness mm. This is the right way to fix truss clips connecting the rafter and. Standard roof truss general load settings.

Shop our wide selection of stock and custom roof trusses to complete your building project available in a variety of styles and sizes. 0 75 kn m snow load. Imposed loads roof snow load and short term point load altitude not exceeding 100m. 35 timber size information.

For a 64m2 house which is a standard 3 bedroom new build you would need 14no 35mm standard roof trusses with a span of 8000mm with a pitch of 35 degrees. Click to add item 26 spreadweb residential roof truss 6 12 pitch 87 to the compare list. Structural calculations for timber joists timber beams glulam beams flitch beams using the latest design codes. The tr26 grade timber that we sustainably source is in accordance with bs en 14081 kiln dried and planed all round.

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. The important point to keep in mind when you use your truss calculator is that every truss calculation is completely unique and is based on the size of your roof and its specific dimensions. 360 mm general truss information. A project of this nature would typically cost 982 80 as indicated by our roof truss instant quote estimator below.

0 524 kn m ceiling dead load. The truss is a framework consisting of rafters posts and struts which supports your roof. 0 250 kn m ceiling live load 0 250 kn m tank load 0 450 kn max tile batten centres. 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.

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.