How Many Attic Trusses Do I Need

Roof rafters or trusses.

How many attic trusses do i need. Irina88w getty images. Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters. To meet the minimum of 30 psf live load 2 x 6 joists that are spaced every 16 inches can span up to about 10 feet or a bit more depending on the joist material different woods have different strengths. However typical roof truss spacing means that they are usually 400mm 16 inches or 600mm 24 inches from centre this means from the centre of one truss to the centre or the next truss.

What are trusses made of. 2 x 10 joists spaced every 16 inches can span 13 to 14 feet. The span of the trusses will be the measure from outside of stud wall to outside of stud wall. Learn about the 30 different types of roof trusses with these series of 30 truss diagrams that clearly shows all the parts and different styles of trusses you can use for different types of roofs.

Roof truss count. This equation roof. The structure should be sufficiently wide to allow for a loft and attic spaces the loft area must be on a living floor and have attic rooms on both sides separated by knee walls a flat ceiling in the loft area and a floor below steep enough roof pitch to provide appropriate ceiling height for the loft area. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.

Given you have used stud walls i would recommend spacing the trusses 24 inches on center so you will need a quantity of the length of the building divided by two plus one. Jul 24 2020 6 28 07 pm. These steel joints are needed to support the overall truss. The number of trusses required for a roof depends completely on the design.

The more complex the truss framework is the greater quantity of these joints will be required. Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters. Many older homes simply do not have the right types of attics to construe this space. Certain conditions must be met before an attic truss can be built.

To determine how many trusses to create you will first need to measure both the width and the length of the structure you are building. Our trusses are made from tr26. To satisfy building code you need to have enough space and the right kind of space to meet these following regulations. The same thing is true for the bridge of the truss.

Tell them you want two foot overhangs and a 12 inch energy heel. Last modified by. Mar 15 2014 4 31 59 pm w width of the area under roof oc on center spacing of the trusses tags.