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-   -   what size beam do i need to change to? (http://www.diychatroom.com/f19/what-size-beam-do-i-need-change-93260/)

turtlekid 01-23-2011 05:34 PM

what size beam do i need to change to?
 
I have a patio attached to my house and I want to change the 4x4 post to hollow tile and want to span the hollow tile columns every 20 feet. What size beam will I have to change the existing 4x8's to?

Ron6519 01-23-2011 07:50 PM

What are, "hollow tile columns"?
Ron

Tigerloose 01-23-2011 08:56 PM

I too am curious about the hollow tile columns. 4"x12" works for a garage door so at 20' span a 4"x16" should do the trick depending on the tributary load of the roof. You can go smaller with an engineered beam like a paralam.


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