Roof Truss Timber Sizes

The truss is a framework consisting of rafters posts and struts which supports your roof.

Roof truss timber sizes.

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. 600 timber thickness mm. All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. The tr26 grade timber that we sustainably source is in accordance with bs en 14081 kiln dried and planed all round.

Automatically calculate suitable rafter sizes enter a specific rafter size 1 3 timber strength. Shop our wide selection of stock and custom roof trusses to complete your building project available in a variety of styles and sizes. Rafters have a tendency to flatten under gravity thrusting outwards on the walls. 0 524 kn m ceiling dead load.

The cost of roof trusses. 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. Pitched roof timber sizes. Structural calculations for timber joists timber beams glulam beams flitch beams using the latest design codes.

The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. 360 mm general truss information. 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 75 kn m snow load.

Click to add item 26 spreadweb residential roof truss 6 12 pitch 87 to the compare list. 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. This is the right way to fix truss clips connecting the rafter and. 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.

Standard roof truss general load settings. 0 250 kn m ceiling live load 0 250 kn m tank load 0 450 kn max tile batten centres. 0 785 kn m snow load. 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.

35 timber size information.