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Old 06-16-2010, 07:25 PM   #1
JeffFromNJ
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IHPA Rating vs. APA rating?

Hey all, this may be answered somewhere. But i went to a local big box store and saw BC IHPA rated plywood for underlayment, how is this different or compare to APA rated BC? Is is comparable and can be used as an acceptable underlayment for tile installation?
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Old 06-16-2010, 09:00 PM   #2
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Hi jeff,

Not really sure bout' IHPA, never herd of em'. But, if it is another accredited association, I couldnt imagin their grading scale to be much differnt. A,B,C,etc.. refers to the level of grade for the particular plys, bc of any association should be ok IMO. But what is more important is is it exposure 1?
This refers to the glue that ties the plys together. exp. 1 is what you want.
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Old 06-16-2010, 09:32 PM   #3
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Yea, I had never heard of that before either. It was a wood apparently from Ecuador, and I looked up IHPA do be some kind of international rating agency, I wasn't sure if this was comparable to the APA rating systems.

Thanks tho!
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Old 06-17-2010, 04:51 AM   #4
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IHPA is the International Hardwood Plywood Association. Their standards are based, from what I could see, more on appearance than structural considerations. What you found may be fine, but if I had a choice, I go with APA rated plywood, since that's what the tile standards were written for.

Thinset adhesion, dimensional stability, screw holding ability, just to name a few things to worry about, in case you were looking for some.
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Old 06-17-2010, 07:59 AM   #5
JeffFromNJ
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Thanks Bob, as always your advice is great.

Looks like i'll check out a local lumber yard, apparently the HD by me doesn't sell anything above a CD grade, and that just won't cut it
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