can u lay new would sheathing over old sheathing when doing a roof to save time and money and what kinds of sheets can be used besides plywood which i know is better but expensive in a sense
thank you
It’s usually the better idea to remove old stock before installing new stuff. But yes, you can put new lumber over old lumber (they put new shingles over old shingles too).
You can use plywood, wouldn’t go anything less than 3/8".
Then there is OSB (Oriented Strand Board), 7/16" would work nicely.
If ya got no rot issues,go over top with 3/8 or 7/16…
[quote=“bcdemon”]It’s usually the better idea to remove old stock before installing new stuff. But yes, you can put new lumber over old lumber (they put new shingles over old shingles too).
You can use plywood, wouldn’t go anything less than 3/8".
Then there is OSB (Oriented Strand Board), 7/16" would work nicely.[/quote]
what bout 3/4 partical board that is what they have now icewolf out
In the states if im not mistaken 3/4 is max due to weight load issues with the trusses and shingle combined. It becomes a weight issue and why not pull it up to see if broken there are trusses.
I am not a fan of old soggy board myself (osb)I would re-deck with 1/2 to 5/8 ply. With that said it depends on truss between centers and all that. If its already at 3/4 you can not go over it. Check the code book from nrca. I know in Michigan it is 3/4 max.
To me, “particle board” is the stuff that they use to make dressers and coffee tables (real small particles of wood glued together), and you don’t use that on your roof.
OSB has the bigger hunks of wood glued together to make a sheet.
If there is already 3/4" OSB and it’s in good condition, I would leave it and not cover it. If it’s the particle board I am thinking of, remove it and install either plywood or OSB.