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Removing Garage Pole 22' span
From: jbrinkerhoff@yahoo.com
Category: Structural
Remote Name: 128.230.62.119
Date: 11 Nov 2002
Time: 02:32 PM
Comments
My girlfriend's house is your typical raised ranch - with the bedrooms over
the 2-car garage. Recently she had a new forced hot air heating installed, so we
got to take a look at the structure over the garage. The garage is 20' wide, and
22' deep. There is a 16' wide garage door on one of the 20' ends. Across the
middle of the garage, going from 20' wall to 20' wall is a beam made up of 3
2x12's, supported in the middle by a metal post. This post is what I'd like to
remove. The upper floor joists run from this post to the door end and
alternately to the rear of the house. They re 2x10's on 16" centers, cross
braced. They overhand the front and rear of the garage by 2' each (there is a 2'
cantilever). The floor above the garage has 3 bedrooms and a bath, all have
sheetrock ceilings, and the "attic" is trusses going the same
direction as the joists. The roof is not steeply pitched, maybe 6/12, with a
single layer of asphalt shingles. We live in upstate ny, and expect to have 3-4
feet of snow on the roof at least a couple times every few years. She is not
concerned about a slightly bouncy floor in the bedrooms, but is concerned about
structure. I was hoping to be able to "sister" on two or more
additional layers of 2x12, but upon reading here it seems that may still not be
enough. Both white pine and southern yellow pine are available locally. Is there
an engineering rule of thimb for beam? I.e. if beam X can span distance Y with a
certain deflection under a certain load and one center support, and one removes
the center support, does one have to double the beam? Tripple? Quadruple? It
would make no difference if this beam had to be built even double its current
thickness - if it worked out structurally. Alternately, what sort of size steel
beam would work in this instance? Thank you! Jeff
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