I Beam Flat Roof

In the example the beam spans the 10 foot width of the roof.

I beam flat roof.

These span tables apply only to flat roof and roof with a slope of up to 10 degrees. 2 end of beam fixed to a masonry wall. The bottom half is carried by the exterior bearing walls. Jun 3 2017 explore anthony valentine s board flat roof on pinterest.

Floor beam span tables of residential structural design we will now look at roof rafter and beam design. An i beam also known as h beam for universal column uc w beam for wide flange universal beam ub rolled steel joist rsj or double t especially in polish bulgarian spanish italian and german is a beam with an i or h shaped cross section the horizontal elements of the i are flanges and the vertical element is the web i beams are usually made of structural steel and are. 3 end of beam fixed to a column or a beam. 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.

For the initial calculation f can be estimated at 1 000. Ends of beams can be laterally restrained using one of the following methods. Beam supporting flat roof joists project number calcs for date ends of beam are to be laterally restrained. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.

The load from the top half of the roof is carried by the bearing wall or structural ridge. Standard american beams aka junior beams or s beams have tapered flanges for added strength when your load is concentrated on the flanges such as machine bases hoists. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. See more ideas about flat roof steel structure steel house.

This beam shape has a wider profile for added horizontal strength making it ideal for sky scrapers or as a house beam along with bridge beams trailers platforms etc. 1 end of beam built into masonry wall. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Let s consider a basic gable wood roof framing design.

Fill in the parts of the formula that are already known. Notches are not to exceed 0 125 of the depth of the joist and are to be located between 0 07 and 0 25 of the span from the support. Instead a wood i joist roof system is framed with either a central bearing wall or a structural ridge a beam that carries the roof load to posts. The total load is 4 000 pounds.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Here we have a wood framed gable roof.