Deck Staining Guide

Key Takeaways:

• Wood decks in Canada need staining every 1–3 years
• Oil-based stains penetrate deeper and last longer in Canadian winters
• Never stain new pressure-treated lumber until it has dried 3–6 months
• Best application window: late spring or early fall when temperature is 10–25°C
• DIY staining costs $1–$3/sq ft vs professional at $3–$6/sq ft

When to Stain Your Deck

New Pressure-Treated Decks

Wait 3–6 months for the wood to dry. PT lumber arrives wet from the treatment plant. Staining wet wood traps moisture inside, leading to premature rot. Test readiness: sprinkle water on the surface — if it soaks in within 10 seconds, the wood is ready. If it beads, wait longer.

Existing Decks

Stain when the previous coating is worn, peeling, or allowing water to soak in. In most Canadian climates, this means every 1–2 years for high-traffic areas and 2–3 years for less-used sections.

Choosing the Right Stain

Step-by-Step Staining Process

1. Power wash at 1,500–2,000 PSI — hold nozzle 12" from surface, work with the grain
2. Let dry 48 hours minimum — wood must be below 15% moisture
3. Apply deck brightener (oxalic acid) — opens wood pores for better stain absorption
4. Sand rough spots with 60–80 grit if needed
5. Apply stain with brush, roller, or pump sprayer — work 2–3 boards at a time
6. Back-brush sprayed stain to work it into the grain
7. Allow 48–72 hours before foot traffic, 7 days before furniture

Top Stain Brands in Canada

What NOT to Stain

• Composite — the polymer cap IS the finish
• PVC — PVC cannot absorb stain
• Aluminum — powder coat is permanent
• Previously painted decks — strip ALL paint before staining (paint and stain don't mix)