Asked by: Fauzia Babioasked in category: General Last Updated: 31st May, 2020
How much weight will a 6x6 beam support?
Similarly, it is asked, how far can you span a 6x6 beam?
Subsequently, question is, how do you size a load bearing beam? The formula for the section modulus is beam width times beam depth squared divided by 6. 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. A 2-by-8 beam would be sufficient.
Likewise, can I use a 6x6 as a beam?
To answer you question, no a 6X6 will not carry that span, even if you have only a roof to support. The strength is in the height of the beam, not so much for the width.
What size lumber can span 20 feet?
Re: 20 foot clearspan beam size In that case, you need something like a 12-16" GLULAM or LVL to span the 20' and can use simple 2x8-10 dimensional lumber 16"OC as floor joists.