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#1
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Spar Urethane for Pressure treated wood
About a month ago we built a small 8 foot handicap ramp out of pressure
treated plywood. Didn't treat it with anything. We had a lot of rain. Noticing a long of cracking going on along the vertical plane. Also made side barriers using plywood. The porous sides face horizontally. I'm getting a bit of warping already. Need to seal off the top. I have some door weather strips I'm going to seal off the openings. Found a can of Minwax Indoor/Outdoor Helmsman Spar Urethane in the cellar. I was thinking of spraying it over all the surfaces. Probably give it a few coats. Would this be the way to go or should I apply something else and/or use a brush? |
#2
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Spar Urethane for Pressure treated wood
New pressure treated is wet, maybe 40%-50% moisture, wood need below 15%
to varnish. It can take months to dry, the only way to know is buy a moisture meter. Varnish is not for pressure treated, stain is. Cracking is normal for pressure treated, but your plywood was a mistake as its interior grade im sure. Wait till its dry and stain it, forget the varnish. |
#3
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Spar Urethane for Pressure treated wood
Charlie S. wrote:
About a month ago we built a small 8 foot handicap ramp out of pressure treated plywood. Didn't treat it with anything. We had a lot of rain. Noticing a long of cracking going on along the vertical plane. Also made side barriers using plywood. The porous sides face horizontally. I'm getting a bit of warping already. Need to seal off the top. I have some door weather strips I'm going to seal off the openings. Found a can of Minwax Indoor/Outdoor Helmsman Spar Urethane in the cellar. I was thinking of spraying it over all the surfaces. Probably give it a few coats. Would this be the way to go or should I apply something else and/or use a brush? A varnish is no good for a deck. Its a lot of maintenance. Also, pressure treated lumber is very wet and will crack, split and warp as it dries. Normally for a deck, once it dries out. We recommend a penetrating oil like Penofin or Sikkens. Plywood is terrible outside (Not as bad as particle board) but will de-laminate when it gets wet. Even "exterior" plywood will do this eventually. I'm not sure the best think to do for your ply. Replace it with a suitable material would be best. Aside from that. A good exterior primer and paint may extend its life the best. For the pressure treated the sikkens is available as a sold color stain that could be tinted to match or compliment your color choice for the deck stain. Good luck. Inviato da X-Privat.Org - Registrazione gratuita http://www.x-privat.org/join.php |
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