Using Flat 2 X 4s As Roof Beams

On the final structure you will not need the beam going between the two walls.

Using flat 2 x 4s as roof beams.

A two 2 by 6 standard beam has actual dimensions of 1 5 by 5 5 inches which would give a section modulus of 1 5 x 5 5 x 5 5 6 7 6 which is not enough for this example. The amc span table table gives me about a 5 6 foot span for a 2 x 4 depending on species live load numbers. Honestly that sounds like a trampoline to me. I m in nj too and would not use 2 x 4 s unless it was a very steep pitch.

It is quite easy for an electrician to run wiring for light fixtures in the hollow framing of the lowered section before it is finished off. Other relevant factors include the type of wood being used for the rafters the size of the rafters and the load that the rafters need to support. Not much snow here some light icing every now. The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of the roof.

Here we have a wood framed gable roof. 2 x 6 s will carry much more load. Continue to 6 of 6 below. Repeat for the rest of the truss until you get to the other side.

With the second beam to go in you will need to construct a support beam between the two 2 x 4s. I m building a ground level deck with 2 x 4 joists supported by adjustable post bases bison s. Structurally it is essentially a lowered soffit that circles the room framed with a box of 2 x 2s and 2 x 4s then covered with drywall. The formula for the section modulus is beam width times beam depth squared divided by 6.

This should be screwed into the square of timber. Calculate the section modulus for the different beams which you could use. One foot overhang so could say 11x16. You can use them for roof floor and even wall framing but few sheds will need trusses for walls.

Jul 24 2014 8 thomasboyle songster. 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. Make sure that the slope is the same all the way along. I can t use a thicker joist because of door threshold clearance.

You can frame a whole house with nothing but 2x4 but it s easier to do a shed as you won t need engineering probably. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. It needs to be able to slide off to shed the weight.

Roof will be roughly 12 x 16. Continuing on from part 3. Feb 28 2013 934 309 186. Front and sides will sit on deck on a 2x4 wall with studs 24 oc and screened in.