Updated - June 2013 : How to Waterproof Plywood
Is Luan Plywood Waterproof ?
This is a question many do it yourselfers have asked... Is luan plywood underlayment waterproof?
I have found out that Luan Wood does not respond well to water exposure. It tends to warp and degrade the material. In fact, this is why you should only use Luan Wood as an underlayment for Vinyl or Laminate Flooring and not for Ceramic or Tile.
The wood will get wet during the installing process. The Wood / Plywood Associations have made a note that Luan Wood has not been fully tested, and has not achieved any grading from the organizations.
There are reports that using Luan Plywood as underlayment for Tile is unacceptable. Some believe that because Luan Plywood is made of an unacceptable and unapproved substrate, it cannot receive Tile or cementituous backer units in a moisturous material.
And so, they say that for Ceramic, Tile, Stone or any other product with a cementituous backer unit, Luan products are not made/manufactured under any recognized grading rules or measures. Also, it is not recognized by the building codes or organizations and does not carry a grade stamp or have any structural design value. This is good to know.
Adding an Epoxy Waterproof Coating to Plywood
Luan Wood Video Series
Bending Luan Wood Video
Installing Luan Wood Video
Cutting and Installing Vinyl Over Luan
Installing Luan Over Subfloor
Laying laminate over Subfloor
Making Tile Flush With Subfloor
Attaching Luan To Subfloor
Working With Luan For Do It Yourselfers
Using Marine Plywood in Kitchens and Baths
Applications for Marine Grade Plywood
What are the Differences in Marine Grade Plywood
Is Dynea Plywood Considered Marine Grade Plywood?
Do you Need to Waterproof Marine Grade Plywood?
How to Install Marine Grade Plywood
Installing Marine Grade Plywood for Boat Building
Boat Building Plans Available Online
Luan and Marine Grade Plywood?
What is Marine Grade Plywood