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Unread 06-07-2019, 10:04 AM   #9
Carbidetooth's Avatar
Join Date: Mar 2010
Location: Boise, ID
Posts: 1,441
Substitute properly attached 1/2" plywood (not CDX) for CBU and you will indeed stiffen the structure. Ditra and plywood are friends.

While CBU might have some perceptible stiffening effect, manufacturers and likewise engineers and inspectors will assign zilch, as would I. Anything else and you become the engineer.

Silicone (not silicon) Sealant Ranger
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