Flat Roof Rafter Vs Joists

Time and i ve figured out that 14 i joists at 2 on center is similar to 2 12 s at 16 on center the span is about 22 feet 10 pitch.

Flat roof rafter vs joists.

An syp rafter can span 11. Code of practice for permissible stress design materials and workmanship and bs 5268 7 2 1989 structural use of timber section 7 2 joists for flat roofs. Rafters form the foundation for attachment of the roof boards onto which the final roof covering is fixed. Ceiling joists can be on both low sloped roofs and high sloped roofs and help to prevent racking and spreading of your rafters or walls which could lead to sagging.

Flat roof with no permanent access and altitude not exceeding 100m 0 75 kn m udl 0 9 kn point load most areas exceeding 100m but not exceeding 200m excluding parts of scotland pennines north east england refer to bs 6399 3 1 kn m udl 0 9 kn point load. I m starting the roof on my house next week. Rafters form the foundation for attachment of the roof boards onto which the final roof covering is fixed. They are important load bearing structural elements that hold up both the weight of the ceiling materials for the floor below as well as the weight of any objects or people that may be housed within an attic space.

Both of these are for light roof loads. To plow so as to turn the grass side of each furrow upon an unplowed ridge. In traditional timber they are nominally 2 inches thick and typically 8 to 10 inches wide. As mentioned above a 2 4 spf shed roof rafter can span 11.

They are nailed securely to exterior wall plates and to each other. If you live in an area that requires a shed roof rafter to support a heavy load then an spf rafter can only span 7. Rafters are the building components that run diagonally from the wall plate to the apex of a roof structure. To furnish with rafters as a house.

In finished space insulation is placed between the rafter boards and drywall or other material is fastened to the face. To make into rafters as timber. In traditional timber they are 2 inches wide and 8 to 10 inches deep. Rafters are the building components that run diagonally from the wall plate to the apex of a roof structure.

Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall. I m trying to balance cost vs. Boarding to be fastened on top of flat roof joists with a depth to width ratio greater than 4 the allowable clear spans have been calculated in accordance with bs 5268 2 2002 structural use of timber part 2. The rafters in a flat roof serve as ceiling joists for the space below.