Exterior grade plywood is not waterproof and is not meant to be used as a base for tile in exterior applications. Exterior tile needs to have a cementious type base which will not swell or deteriorate when wet.
The general practice, is to leave the underside of plywood decking bare, as this allows the wood to breathe, and be able to dry out. When using treated, or marine grade plywood, only one side, usually the top side, is sealed.
In order to get a waterproof house deck it is important to purchase a good system of waterproofing and drainage. The system has to be installed and maintained correctly.
To ensure that the canopy for your deck is waterproof, you can use a waterproof fabric or material for the canopy, apply a waterproofing spray or sealant to the canopy, and make sure the canopy is properly installed and secured to prevent water from seeping through.
You do know they have "Wolmenized or pressure treated plywood", if these are not to your liking, you can use a polyurethane but the edges will be your problem areas, the edges have to be completely sealed, (to do this is time consuming) I wouldn't use a deck sealer, this could delaminate the plywood. If the project is indoors, but in a damp or humid area, you can apply a "Vinyl sealer", 2 coats, and then apply a "Pre-cat Lacquer, 2 to 3 coats. Both these products are available for about $28.00 a gallon, AT: * http://www.hoodfinishing.com/
form_title= Decking Material form_header= Create your dream deck with help from the pros. What size deck do you want?*= _ [50] Do you want to waterproof your deck?*= () Yes () No What color deck do you want?*= _ [50]
The question cannot be answered without information on the length of the piece of plywood that Josh has.
Used on exterior decks, the boards are treated with chemicals and pressurized to keep them from rotting and protection from insects eating the boards.
If replacing with wood, use marine grade or treated plywood, these are the industry standards.As far as other materials, you might consider using starboard. It would be expensive, but it would be the last time you had to replace the deck.
Ensure that it is clean and oil-free; remove any mold or mildew using a bleach solution; allow the surface to dry completely prior to applying your acrylic deck paint.
Charlotte's first task in preparing to go on deck each morning was to put on her waterproof clothing to protect herself from the elements.
Depending on your needs, Rubbermaid sells storage boxes for outdoors that range in size from small to shed size. They have a waterproof deck box that is a medium sized offering for waterproof storage.
The roll-able stone effects would adhere to the plywood but there is risk of 'pin holes' through the coating, so you need to make sure you use the protective top coat/sealant. Just make sure the area is clean of all loose dirt etc. Also I would highly discourage the product over living spaces under the deck. Behr makes a comparable product now, called Deck Over. That is a similar coating but lighter texture w/o the protective glaze. Deck Over will also do plywood. Also I would highly discourage the product over living spaces under the deck.