Vijay Posted July 12, 2018 Share Posted July 12, 2018 Morning I'm sure there was a post about waterproofing normal ply but I've searched and can't find it. Is there any suitable way of waterproofing normal shuttering ply so it can be used outside without coming apart? Cheers Vijay Link to comment Share on other sites More sharing options...
Onoff Posted July 12, 2018 Share Posted July 12, 2018 (edited) You could use a water repellent like Thompsons Water Seal (theres a No Nonsense one too) but what you really need to do is treat the edges and use something to stop the edge delaminating, water getting in and so on. Cheaper plys have holes and gaps along the edges. I don't think the "waterseal" types would do it. Maybe Waterseal the faces and black bitumen paint (or even cheap gloss?) the edges? How many to do? On show as a feature? Maybe something like Sadolin if only one or two and do all faces and edges. I have a feeling cheaper, non WBP plys might come apart anyway through temperature extremes aside from water ingress. Edited July 12, 2018 by Onoff Link to comment Share on other sites More sharing options...
PeterW Posted July 12, 2018 Share Posted July 12, 2018 Is this temporary or permanent ..? most shuttering ply is already WBP anyway, marine ply is just certified to have no voids and the more expensive ones have thinner layers and more of them than cheap ply. Link to comment Share on other sites More sharing options...
Vijay Posted July 12, 2018 Author Share Posted July 12, 2018 temporary, it's for the windows and doors shuttering on my ICF build, but I'm hoping to just re-use a lot a of it for the upstairs windows. This stuff definitely doesn't like water, started to laminate when a slight bit of rain got on the ends. Happy to use water seal and a bitumen paint on the edges if that works but would fence paint work on the faces of the ply instead of water seal, as I have some already? Link to comment Share on other sites More sharing options...
Russell griffiths Posted July 12, 2018 Share Posted July 12, 2018 Have a look at a product called medite smart ply they do one specifically for site fencing so it will be outside for months. Link to comment Share on other sites More sharing options...
PeterW Posted July 12, 2018 Share Posted July 12, 2018 OSB would be better Link to comment Share on other sites More sharing options...
Vijay Posted July 12, 2018 Author Share Posted July 12, 2018 osb just swells when wet though?? Already bought the ply now and had it cut down Link to comment Share on other sites More sharing options...
Russell griffiths Posted July 12, 2018 Share Posted July 12, 2018 If you’ve already got it why not buy the cheapest gloss paint you can find and like @Onoff said coat the edges really well bfo roller should see it not take long. Link to comment Share on other sites More sharing options...
Vijay Posted July 12, 2018 Author Share Posted July 12, 2018 more than happy to do that Anyone know if fence paint be ok for the face of ply? Link to comment Share on other sites More sharing options...
Onoff Posted July 12, 2018 Share Posted July 12, 2018 (edited) I painted some brand new OSB3 with No Nonsense Wood Treatment after putting it on the kids playhouse roof. Unfelted but covered by a tarp since. Sure it softened the glue holding the OSB together as the edges have blown a bit. I'd honestly rather use marine ply than OSB on say the side of my dormer when I redo that. I know I'll be a lone voice on this! Edited July 12, 2018 by Onoff Link to comment Share on other sites More sharing options...
PeterW Posted July 12, 2018 Share Posted July 12, 2018 44 minutes ago, Onoff said: I'd honestly rather use marine ply than OSB on say the side of my dormer when I redo that. I know I'll be a lone voice on this! Depends what the top coating is - OSB is fine as a backing but not as a final surface, and under lead it can show pattern. GRP and I would go OSB as it’s sealed in and the surface mechanically bonds to the sub structure too Link to comment Share on other sites More sharing options...
nod Posted July 12, 2018 Share Posted July 12, 2018 2 hours ago, PeterW said: OSB would be better I’ve had cheap osb on the back of mine for twelve months Still ok Link to comment Share on other sites More sharing options...
SteamyTea Posted July 12, 2018 Share Posted July 12, 2018 Pity I did not take a picture earlier today. I made a cheap ply planter and painted it with cheap fence paint. After 4 years filled with dirt and plants, the ply was fine, the screws had failed due to corrosion. Link to comment Share on other sites More sharing options...
Vijay Posted July 12, 2018 Author Share Posted July 12, 2018 perfect Link to comment Share on other sites More sharing options...
mvincentd Posted July 17, 2018 Share Posted July 17, 2018 Maybe d4 wood glue as used on seams of stuff like egger protect Link to comment Share on other sites More sharing options...
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