Moisture barrier

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Forum topic by Carloz posted 11-21-2017 05:07 AM 392 views 0 times favorited 4 replies Add to Favorites Watch
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1147 posts in 1365 days

11-21-2017 05:07 AM

My kitchen island build is nearing completion. It is intended to replace the old one bult mostly from particle board that was half destroyed by some minor leaks. The island does have a sink.
The new island is built completely from maple. Inside dividers from marine grade plywood. Still since it will be standing on concrete floor i want to protect it from excessive moisture coming from the bottom.
Maybe some tape ? Regular moisture barrier for wooden floor wont work as the island wall are very thin ( standard 4/4 stock) unless I glue it to the wood somehow . Any ideas?

4 replies so far

View JBrow's profile


1368 posts in 1694 days

#1 posted 11-21-2017 12:43 PM


Some moisture barrier ideas are, as you are thinking, to apply house wrap tape (used to tape house wrap seams) to the floor contact edges. Roofing felt or 6 mil polyethylene glued in place could also work. Silicone caulk spread as a thin layer on the edges could be helpful. A thin strip of aluminum could be applied to the edges with countersunk screws.

The better solution may be to elevate the cabinets so the plywood is not in contact with the floor. Leg levelers could not only elevate the base cabinets but could make leveling cabinets a little easier. This option would require base trim in contact with the floor to hide the gap around the island.

No matter the solution, sealing the floor contacting edges with several coats of a film finish could offer a last line of defense.

View bondogaposis's profile


5789 posts in 3125 days

#2 posted 11-21-2017 02:25 PM

View johnstoneb's profile


3144 posts in 2947 days

#3 posted 11-21-2017 02:44 PM

Moisture barrier should go between the concrete and ground. Any damage to the island will likely come from leaks etc above the concrete that run over and make contact with the wood and aren’t cleaned up immediately , ventilated and allowed to dry. If worried about that you need something to raise the wood off the floor entirely.

-- Bruce, Boise, ID

View Robert's profile


3747 posts in 2255 days

#4 posted 11-21-2017 03:10 PM

With marine grade ply I wouldn’t fret too much over it you shouldn’t have a moisture issue if there is a moisture barrier under the slab.

If the height is already determined, 6mil plastic wrapped around sides and cover with base moulding. Or you could add a think strip of treated lumber to bottom edges.

I really like the bedliner spray idea. Good idea, bondo.

-- Everything is a prototype thats why its one of a kind!!

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