2 By 4 Roof Rafters

The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.

2 by 4 roof rafters.

It is always better to have a large rafter rather than be concerned with a sagging roof. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. I put 2 2x4 joist about.

Continuing on from part 3. Here we have a wood framed gable roof. For roofs that won t experience heavy snow loads a gable roof can span up to 22 with 2 4 rafters. Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.

1 3 of the way from each in to keep it from spreading from snow load. When you cut the rafters you ll need to make 3 separate cuts. Will 2x4 rafters 24 inch on centre hold up my 8 x 12 shed. Without even running the calculations i would say there is a good chance the 2 4 purlins will not make the deflection criteria required for a roof framing member supporting steel.

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. You can use either 2 6 or 2 4 rafters for roofs with a 3 12 pitch or greater but it depends on the overall size of your shed. Remodeling an old house that has 2 4 roof rafters 4 on center rafters are close to 12 long with 1 6 trusses 1 6 king post type there is no ridge board ceiling joists are 2 6 4 on center that span 19. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

Not sure of roof pitch but it is pretty flat distance from top of ceiling joist to peak of ridge is less than 4. In bending 2 4 2 purlins would work at 12 on center however i personally would not want to walk on top of them. Let s consider a basic gable wood roof framing design. Built on 4 12 pitch roof with 1 2 ply decking and shingles.

Floor beam span tables of residential structural design we will now look at roof rafter and beam design. Rafter is a sloping beam usually wood that supports a pitched roof. For roofs that will experience heavy snow or wind and will span the same distance use 2 6 rafters. There could be many rafters supporting a roof.

It is one of a series of sloped structural members that extend from the ridge or hip to the wall plate designed to support the roof deck and its associated loads. My shed is 8x14 built entirely with rough 2x4s. Skinned with 7 16 osb and vinyl siding. Rafters are on 2 ft spacing.