Peeling can result when wood expands and contracts from moisture, eventually causing a paint coating to loosen. Moisture reaches painted wood in a number of ways:
- Through uncaulked joints
- Through worn-out caulk
- Gutters full of ice or debris
- From moisture inside the building
- Through damp basements
- Painted boards too close to ground
- Plant growth
- Leaky roofs
Peeling can also result when painting over wood that has had insufficient drying time after exposure to moisture from rain, dew or pressure-washing.
- Eliminate the source of moisture:
- Remove and replace loose and worn caulk.
- Install vents/fans to remove moisture from inside the building.
- Waterproof the foundations.
- Remove wood touching the ground.
- Clean out gutter and downspouts.
- Install wedges under siding boards.
- Allow damp or wet wood to dry for 3 to 5 days before painting.
- If pressure-washing above 500 psi (not recommended), allow up to 3 weeks’ drying time.
- Remove all loose paint.
- Feather any rough edges with sandpaper.
- Spot-prime all bare areas with exterior primer.
Note: For more information regarding moisture inside homes and possible remedies, obtain a copy of Canada Mortgage and Housing Corporation’s “Moisture and Air – Problems and Remedies” by calling their Victoria office at (250) 363-8040 or by calling your local CMHC office.