previous
  • Tips & Techniques for Painting
    Tips & Techniques for Painting
  • 7 Trim Carpentry Secrets
    7 Trim Carpentry Secrets
  • Energy-Smart Details
    Energy-Smart Details
  • Basement Remodeling Tips
    Basement Remodeling Tips
  • Video: Install a Fence
    Video: Install a Fence
  • Video Series: Tile a Bathroom
    Video Series: Tile a Bathroom
  • 7 Smart Kitchen Solutions
    7 Smart Kitchen Solutions
  • All about Roofing
    All about Roofing
  • Magazine Departments
    Magazine Departments
  • Read FHB on Your iPad
    Read FHB on Your iPad
  • Master Carpenter Videos
    Master Carpenter Videos
  • 7 Small Bathroom Layouts
    7 Small Bathroom Layouts
  • Custom Flooring Inspiration
    Custom Flooring Inspiration
  • Clever daily tip in your inbox
    Clever daily tip in your inbox
  • 9 Concrete Countertops Ideas
    9 Concrete Countertops Ideas
  • Remodeling Articles
    Remodeling Articles
  • Radiant Heat Comparison
    Radiant Heat Comparison
  • Design Inspiration
    Design Inspiration
next

Flattening warped plywood

Even new plywood can warp if not stored properly or if left in the sun. Before you give up in frustration, though, try a little moisture therapy.

Like the underside of a shriveling leaf, the plywood’s concave side has lost moisture and shrunk. Reversing the warp can be accomplished by adding moisture to this concave side and drying the convex humped side. I use a sponge or sprayer to wet the concave side of the plywood (hot water works best). Then I lay the sheet, moist side down, on a shop floor or a driveway. Now the sun, or the warm interior air, helps to dry out the convex, humped side of the plywood. At the same time, moisture is being absorbed into the concave side. This process works faster than you can imagine, so keep an eye on the material. If it warps the other way, just reverse the process.