To calculate the costs, we use the following two formulas: Here, we assume that the on-center spacing equals 24" and the roof length is given in ft. Rounded up to the closest integer (for example, if the result is 14.5, you need to get 15 trusses). To do so, it uses the following equations: If you're unsure about the terms such as roof run and rise, refer to the illustration below: (Image created on the basis of: King post truss 3D created by George Ponderevo, licensed under the Creative Commons Attribution-Share Alike 3.0 Unported licence.)Īs you know, figuring out rafter length and other truss dimensions is not the only thing you can use this tool for! Our roof truss calculator can also help out with planning out your roof project by estimating the truss count and showing you the costs you can expect for the materials and their installation. We can merge these two equations to get a single rafter length formula based on roof pitch: So what you need to do first is to get the pitch using the following formula: The one difference is that we need to calculate the roof rise using the pitch first. The formula used to calculate rafter length from roof pitch is, in fact, the same as the one above.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |