Restoring weathered exterior wood

 

Restoring weathered exterior wood

Checklist

  • Plastic container
  • Warm water
  • Rubber boots and gloves
  • Brush, roller, garden sprayer, stiff bristled brush or mop
  • Protective goggles
  • Plastic watering can
  • Comfortable old clothes
  • Hose and nozzle
  • High-pressure washer
  • Electronic moisture-testing equipment
  • Cleaner, brightener and conditioner for exterior wood Sico 771-222 (powder), 771-333 (liquid) or 771-666 (liquid, environmental choice).
  1. Mix 120 grams of powder crystals (771-222) with 4 litres of warm water in a plastic container and let the solution dissolve completely. If you are using the liquid product (771-333), mix one part of the product with 4 parts of water. If you are using the environmental liquid product (771-666), mix one part of the product with one part of water.
  2. Spray surrounding vegetation with clean water before starting.
  3. Generously apply solution using appropriate tools, such as a brush, roller, garden sprinkler, stiff bristle brush or a mop.
  4. Let solution work for about 15 to 20 minutes. Solution shouldn’t dry. You may need to add more to keep it humid.
  5. Rinse surface with power washer. Make sure pressure is no greater than 3400 kPa (500 lbs./sq. in.) to prevent damage to wooden surfaces. Keep nozzle within 30 cm of surface for best results. Note: At 400 Kpa – 60 lbs./sq. in., home garden hose pressure is not sufficient. For this process to work, it is important to use a power washer.  To avoid damaging the wood fiber make sure the pressure is at 500 lbs./sq. in.
  6. Repeat this operation if needed.
  7. Spray surrounding vegetation with clean water after treatment.
  8. Let surface dry for 2 to 3 days of dry weather before applying a solvent-based coating and 24 hours for a water-based coating.
  9. If any glossy spot remains, sand the surface with 60/80-grade sandpaper for floors and 80/120-grade sandpaper for walls.