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Old 04-17-2011, 10:14 PM
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roger roger is offline
 
Join Date: May 2007
Location: wmu 222, member #197
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id use 3 PT 2x6's laminated together. if strait and square is important then this will be better than twisty 6x6;s
the pressure treatment only penetrates maybe 1"-1 1/4" whereas almost the entire 2x6 would have been preserved. use copious amounts of endcut preserver as well.

there is(or at least, was) a product called Elsroe520, a water based membrane that rolled on wood basements with a paint roller.
keep applying it until its all used or sealed 100%,
consider applying that as a waterproofing.
id be running screw piles with a skid steer if ihad to do it again
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