Exterior Wood/Siding and Trim/Painted/Flaking or Peeling/To Be Painted

a. Surface Preparation:

NOTE‚ If lead is suspected in the paint, do not attempt to scrape, sand, power wash, use heat gun, etc., which might put lead into the environment, but rather contact a contractor qualified for lead assessment and abatement

  • remove all loose or poorly adhering paint by scraping, or by careful hand wire brushing using a stiff metal wire brush going with the grain of the wood; wear eye protection, work gloves and a dust mask
  • for wood shakes, use hand wire brushing with vertical strokes; note that with a steel wire brush on cedar, all bits of steel wire must be removed or discoloration can result
  • feather sand rough edges of remaining paint; refresh surface of exposed, weathered wood by sanding with medium grit (#120) garnet paper; if gloss or semigloss paint will be used, follow by sanding with fine grit (#220) garnet paper; wear eye protection, work gloves and a dust mask
  • dull any glossy paint by sanding with fine (#220) grit garnet paper; wear eye protection, dust mask and work gloves
  • treat any mildew with a 3:1 water:household bleach mixture, leaving it on for 20 minutes and adding more as it dries; wear eye and skin protection; rinse thoroughly
  • remove dirt, chalk, dust, residual particles of paint, treated mildew, etc. by scrubbing with detergent and water, rinse thoroughly

b. Priming:

  • prime areas where old paint has come off
  • for best results, prime entire job
  • use quality exterior stain blocking latex or oil-based wood primer
  • do not leave a primer unpainted

c. Painting:

  • use top-of-the-line exterior 100% acrylic latex house paint in flat, satin, semigloss or gloss finish, depending on appearance desired
  • a flat finish will provide a more uniform appearance; quality satin and semigloss finishes will resist mildew more than a flat
  • use quality oil-based primer and paint if surface has build-up of old oil-based paint
  • do not apply oil-based paint over latex paint
Advertisements

About this entry