Hidden Attic Beams Spanning 20 Feet

Bob vila 429 811 views.

Hidden attic beams spanning 20 feet.

This will support the weight of itself. Anyway i want to put a hidden beam in the attic but an engineering friend of mine recommended building a truss in the attic instead. L stands for the span of the beam in feet. For the initial calculation f can be estimated at 1 000.

It can be loaded with about 5 000 pounds of equally distributed weight. F stands for the beam s fiber strength in bending which depends on the species of wood. 2 x 12 s are not listed because you can span pretty much whatever you want. Removing and supporting a load bearing wall with a hidden beam part 3 trey clanton.

The widest span in the floor joist span table in part 2 of this tutorial module showed that floor joists can span 17 2 if they are 2 x 12s spaced 12 o c. Staggered pattern with at least a 3 x 120 nail. Here is a little more info. A beam this size can be loaded with about 10 000 pounds of equally distributed weight.

Let s expand our house beyond that 17 2 span capability to 24 feet wide. The 2012 irc code calls for a minimum of a 32 o c. Attached to the beam with joists hangers to top of other outside walls. Centers as well as the rafters.

Fill in the parts of the formula that are already known. This ceiling joist span table is based on the 2012 irc for uninhabitable attics with limited storage. So the house dimensions will now be 24 x 13. A beam spanning over a 6 foot wide pass through will need to be made of 4 8 lumber and be about 8 feet long.

W beams and s beams both have a distinctive i shape whereas the width and depth are more similar in w beams the depth is noticeably greater than the width in a s beam. Bob vila eps 1403 duration. It covers 2 common lumber species and sizes at 20 pounds per square foot load. The roof system is stick built so there are no manufactured engineered trusses the ceiling joists are on 16 in.

Although 2 x 4 s are included in the official table they are not listed because it is never advised to use them. 1 2 select steel beam size select the steel beam size from the dropdown list. In the example the beam spans the 10 foot width of the roof. You have a choice of w beams s beams or american standard channels.

The total load is 4 000 pounds. Jacking up floor joists episode 171. A beam spanning 12 feet will need to be constructed of 4 x14 lumber.