With the decreasing availability of large structural lumber work with trusses for your roof construction can save you money and also comply with all structural needs for your project. The length of lumber subject to bending stress are broken into smaller sections, and that’s the main reason you can work with cheaper lumber products. But take care of some extra costs when doing trusses for your roof.
You have a lot of types of truss designs, and during the design of your project you have to adapt all your load needs. The maximum allowable span depends on the type of wood you are using in your construction (Southern Pine, Douglas-Fir and Spruce Pine-Fir – also known as SPF – are the most common) and also on the pitch of the top cord.
You have some places in the internet to help you on calculating the allowable span for trusses in your project. Click HERE to redirect you to one of these websites.
A final message: remember that in the majority of the houses you will be building with roof trusses you’ll need a crane to help one the truss installation. The costs will vary from region to region, and for a house around 2,500 sf, ranch style, you will need at least 8 hours of crane work if you have a trained team to installed them. Don’t forget to include this cost in your project.