The bottom flanges of roof rafters shall be continuously braced, at a maximum spacing of 4 feet (1219 mm) as measured parallel to the roof rafters, with one of the following members: Minimum 33-mil (0.84 mm) C-shaped member. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. R804.3.2.5 Roof Rafter Bottom Flange Bracing. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". It is measured from the center of one rafter to the center of the next, also known as ‘on-center’, which makes it easier to determine the number of rafters based on the building’s length. The cookie is used to store the user consent for the cookies in the category "Analytics". Rafter spacing is the distance between parallel rafters or roof joists. This cookie is set by GDPR Cookie Consent plugin. RAFTER SPANS FOR COMMON LUMBER SPECIES (Ground snow load 30 psf, ceiling attached to rafters, L / 240) Check sources for availability of lumber in lengths greater than 20 feet. These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. I know you might not understand what that means when you do load combinations the first time, but we did a whole article about what loads exist and how to apply them on a pitched roof □ LC1 We haven’t covered wind bracing systems yet, – how they work, why we need them – but would you be interested in learning more? Let me know in the comments below. Rafter roof with timber joists and wind bracing straps. ![]() One example of the rafter roof type can be seen in the next picture where a timber beam is chosen as the ceiling joist which takes up the horizontal support forces of the rafters in, mostly, tension.Ī steel wind bracing strap is furthermore chosen as the wind bracing system. Depending on the design the rafters can also be cantilievered to create an overhang of the roof.Īs already mentioned, there is different ways to build the rafter roof, meaning that the different elements can be built with different materials and systems. When you plan to build an addition to your own home, or you want to know how your builders have to do something, you will need to see a lot more. ![]() The rafters are statically speaking beams and have usually a connection/support at the bottom (floor) and the top (2nd rafter or ridge board). In 24 inch rafter spacing, collar ties are on every other pair of rafters or 48 inches apart. The rafter roof consists of 2 rafters which are inclined and connected to each other at the top with a ridge board.
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