12mm WBP exterior plywood - how much rain can it stand ?

[seanxkelly]

In an earlier post I mentioned my mission to affect some sort of roof repair to my garage/utility room roof.

I want to "reboard" the roof as the current one has a few small dips which collect water and if I just overlay some new felt (or something) these might continue to collect and eventually lead to new weak points.

So (part of) my plan is simply to screw some new 12mm WBP exterior plywood down on top of the old roof just to level stuff out and then apply the new felt (or whatever) on top of that.

Problem is that we're having frequent spells of bad weather here in the UK and I probably can't get the entire job done in one run of dry weather !

So.....

If I get the WBP ply down first, will that survive a few days of rain before I get the chance to apply the layers of felt (or whatever I'm using) ?

Thanks,

Sean.

 

[SurreyRoofingEstimator]

It should survive ok but best to get it covered ASAP as any damp that gets in will warp the layers, why not look into using OSB, maybe slightly more expensive but more resiliant.

 

[Jaffa72]

Cover it with a tarp

 

[noseall]

a lot of exterior grade ply's are designed to handle some weathering.

but i'm sure no company will absolutely guarantee against delamination.

 

[big-all]

2 or 3 days wet should be ok even on 2 or 3 different occasions as long as it drains inbetween

the worst thats likly to happen is one layer will delaminate slightly for a few inches if it dosnt dry