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Re: Masonry Expansion Joints[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Masonry Expansion Joints
- From: PyperEng(--nospam--at)aol.com
- Date: Tue, 3 Aug 1999 20:33:59 EDT
I note with interest your expertise on masonry buildings. I am curious about the real need for expansion joints on large commercial retail warehouses in Florida eg Home Depot, Builders Square etc. I have found that most rely on the control joints at +/-30 ft o.c. with a tendency for expansion joints at +/- 250 feet o.c. The National Concrete & Masonry Association says the biggest problem they hear about is shrinkage rather than expansion as the blocks dry out during the initial periods. Our calculations indicate up to one inch expansion for masonry over one hundred feet for a seventy degree temp variation. The real world is strange in that common "verbal design experience" states if a building takes up more than one sheet then an expansion joint is needed! I was seeking a more scientific approach. However it appears the construction world will continue to make the control joints serve as expansion joints. I wonder what happens after the filler is compressed and does not expand again. I would welcome any comments. Thank you. Andrew Pyper, Florida
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