Posted by Norb on December 08, 2003 at 10:23:35:
In Reply to: Re: I-beam atttached concrete blocks need ideal posted by Dave on December 06, 2003 at 14:15:35:
General rule of thumb: Span [clear distance between the walls] divided by 2, + 2 = depth of beam in inches.
Example: 30 foot span divided by 2= 15, + 2 = 17 inches. Therefore, use an 18-inch deep beam [nothing made is 17" deep]; or a 16" that weighs more.
Beams are noted as W 18x40, for example, where the W is the type of beam [just take that and use a W beam], the 18 is the depth in inches and the 40 is the number of pounds the beam weighs per running foot [i.e. 30 foot beam would weigh 1200 pounds] So if you use a 16" beam it should weigh between 60-90 pounds a foot, so it is stout enoguh to hold the roof.
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