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Retention levels are set by the AWPA and inspected by the AWPB and should be stamped with a seal.
.25 lbs per cubic foot – Rated for outdoor use above grade only.
.40 lbs per cubic foot – Rated for ground contact. This will work well for joists.
.60 lbs per cubic foot – Used for wood foundation systems- this is required if you plan on burying your support posts in the ground.
.80 lbs per cubic foot – Marine Use: Freshwater Contact
2.50 lbs per cubic foot – Marine Use: Saltwater Contact |