What is EXT Plywood?
EXT Plywood is Simply Exterior Plywood Grades.
Exterior Plywood (EXT) is intended for use in projects with no structural requirements, exterior applications where a high quality finish is required. A bonded exterior plywood must be used for applications involving long term full exposure. All A bonded, exterior plywood should be treated against fungal attack and should be surface finished to minimize surface checking.
Screwing Luan Wood (Plywood)
The Best Screws for Use in Luan Plywood are Wood Screws, what you should do is also use some wood glue on the joints to ensure a solid seal. When using wood glue, and use it properly screws in luan plywood will have a stronger grip than just using the wood screws on their own. If you are doing a project near a water hazard, or a project that will be getting wet a lot, then you will want to use a wood glue with a tight bond 3 rating. If it will not be in contact with a lot of water any wood glue will do.
OTHER LUAN WOOD QUESTIONS ANSWERED HERE:
How to Install a Subfloor With Luann Plywood When installing luann, you can place the laminate directly over the luann plywood. This will work regardless of room temperture, and will lock out moisture if that is a concern of yours as well. When you attach the flooring, use staples with a quarter crown. They are small and fast, and they won't leave holes if you decide down the line to refinish the flooring. Also leave quarter inch expansion at all vertical walls. This is important to allow for strinkage and expansion during different climate conditions which you may experience throughout the year. Read More
Installing Subflooring for Laminate, Vinyl, Tile or Hardwood (With Luann Plywood) .
1. Use as thick a subflooring material as you can, or you can find. This will be important when moving on to the grout and tile work.
2. Stiffen the floor to ensure that the new subfloor will be strong than the previous flooring.
3. Nails may not be strong enough for installation and may pop out. Use a ring shank nail, and it is basically a screw. Read More
Luann As an Underlayment For Vinyl
Because Vinyl, forms very tightly to the surface floor when installed it tends to show all uneven patches, and groves. To reduce the appearance of surface floor when you install Vinyl, or any other flooring material a good choice to use is Luan. Luan, is a thin plywood underlayment that is light, and very simple to install. While Luan does help in smoothing out surface floor irregularities, it is not always the best solution for all flooring types. Read More