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Unfilled CMU Piers

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[#1] Posted: 06/05/2012 - 11:45:29 AM
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These are 8" x 16" blocks side by side. Should they be filled with mortar considering:

R606.6 Piers. The unsupported height of masonry piers shall
not exceed ten times their least dimension. When structural
clay tile or hollow concrete masonry units are used for isolated
piers to support beams and girders, the cellular spaces shall be
filled solidly with concrete or Type M or S mortar, except that
unfilled hollow piers may be used if their unsupported height is
not more than four times their least dimension
.


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i.e. Would you consider their least dimension 8 or 16"?

Mike Lamb
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Unfilled CMU Piers
[#2] Posted: 06/05/2012 - 12:54:15 PM
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...........a single-stack pier would have 8" as the least dimension. As shown in the picture, the double-stack pier has 16" as the least dimension.............Greg.
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Unfilled CMU Piers
[#3] Posted: 06/05/2012 - 2:29:16 PM
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Quote: ...except that unfilled hollow piers may be used if their unsupported height is not more than four times their least dimension.


My vote would also be 16" in this case. It seems clear that the "their" refers to piers as a whole. It wouldn't make sense to use the first "their" for total height and then use the second for individual units.

Richard Moore
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Unfilled CMU Piers
[#4] Posted: 06/05/2012 - 3:25:07 PM
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I will concur and go after the silly OSB shims beneath the beams. They were squishing before my eyes.
Mike Lamb
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Unfilled CMU Piers
[#5] Posted: 06/05/2012 - 5:57:30 PM
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..........there was another post here earlier today - where'd it go Marc?
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Unfilled CMU Piers
[#6] Posted: 06/06/2012 - 07:08:55 AM
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'06 IRC

R606.6.1 Pier cap. Hollow piers shall be capped with 4
inches (102 mm) of solid masonry or concrete or shall have
cavities of the top course filled with concrete or grout or
other approved methods.

Hollow uncapped piers can be termite highways whose cavities are not visible to annual termite inspector.

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Unfilled CMU Piers
[#7] Posted: 06/06/2012 - 07:52:12 AM
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Quote: Originally posted by Greg Booth

..........there was another post here earlier today - where'd it go Marc?

I deleted it after noticing my error.

Marc

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