Standard Roof Truss 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.

Standard roof truss centres. Common or standard trusses are symmetrical and have standard four inch heels. They are designed at a 4 12 pitch to be spaced 2 foot on center. Member size grade tc 1 4 4 7 97 tr26 bc 6 10 72 tr26 bc 10 2 72 tr26 wb 3 8 5. One goal of truss design is to build a roof structure that is as strong as necessary but that uses the minimum amount of lumber.

And the trusses are also going to be around the same spacing that is twenty four inches off centre. 0 785 kn m snow load. Provided the design takes them into account. Rafters have a tendency to flatten under gravity thrusting outwards on the walls.

Click to add item 24 spreadweb residential roof truss 5 12 pitch 87 to the compare list. Roof trusses are capable of supporting service loads from heating units air conditioned units hot water service etc. Add to list click to add item 24 spreadweb residential roof truss 5 12 pitch 87 to your list. Although the standard spacing of roof trusses may be the same as that of rafters with 24 inch spacing being a common option the design of a truss may allow for the use of a lower grade of lumber than would be.

35 timber size information. 0 250 kn m ceiling live load 0 250 kn m tank load 0 450 kn max tile batten centres. The roof truss spacing standard is important because eighty percent of new homes are built with standard pre fabricated trusses. 1 4 services 1 4 1 general.

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. Pre manufactured stock trusses are constructed with spruce pine fir spf or southern yellow pine syp lumber. Installation guidelines for timber roof trusses to be read in conjunction with as4440 2004 september 2016 2. Pole barn roof truss spacing generally tens to operate according to similar.

These loads can be other trusses that attach by sitting on top of the girder. 0 524 kn m ceiling dead load. These trusses the meet building code criteria as specified by structural building components of america sbca and the truss plate institute tpi. Girder trusses are designed to carry additional loads other than standard roof loads.

600 timber thickness mm. 360 mm general truss information. Standard roof truss general load settings.