It will carry a ceiling load and a partial roof load. And your carry beam which the joists sit on to span 20 feet or so forget it you are talking a major structural beam way beyond a 6×12 in wood into a custom size natural wood beam like maybe a 6×18 or 8×14 or a manufactured beam bad for outdoor use or a good sized steel beam and beyond about a 10 12 span you would be heavier.

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### Youll find a beam span calculator towards the bottom of this page.

**20 ft span beam size**. This site also has information on learning how to read joist tables and a joist calculator. The beam is 65 wide and 8 deep. Unless your using steel but expensive.

Allowable load tables tables providing size selections for various beam spans and loading combinations for southern pine dimension lumber and southern pine glued laminated timber are available for the following applications. Better design with truss 2 feet deep or more depending on snow load. I would like to keep the height of both beams to a minimum by using heavier beams if possible.

Almost any wood will do the same geometry of beam or truss is the important thing. Most interior beams need to include the roof load. Steel beams will be smaller than wood and are very handy for smaller spaces.

Headers beams. Forum responses minimum roof loading is 20 lbsq. You need to determine the spacing of the beams as well as the load or weight capacity.

There is a formula but you need to consider those values to determine the size of beam. For a 20 foot span wood beam needs to be minimum 18 inches deep. The ceiling joist span is 12 feet each side of the beam of which they be hung off of.

There is a strut every fourth ceiling joist that is connected to the rafters at a 45 degree angle on each side. On this page we will explain how to read and design with floor beam span tables. Also going to be pretty tough finding beams over 20 ft.

Each beam weighs 28 pounds per foot of beam. I need to size a steel i beam for a 20 foot span in a house. This calculator matches up with 90 of the applications in the 2012 international residential code book.

You can use a w8x28 50 ksi steel beam for your 20 clear span roof beams. Ok so you 20 span roof beams are what i just sized. It will carry a ceiling.

Size selection tables headers beams. If smaller beam will sag ugly. Feet more in presence of snow.

If there is are any questions about anything else then you should contact your supplier or an engineer. I would like to calculate the size of two i beams with a span of 20 feet for a two story residential house addition. Designing with floor beam span tables part 3 of residential structural design.

It has been my experience to never use a beam smaller than a two ply 2 x 8.

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