Water proofing OSB?

cwm · 24 May 2007

Hi,

i am currently in the middle of building a wooden workshop,
all frame work is done.

tomorrow the OSB boards are coming for the roof,the problem being,

if i put them up and it rains before the roofing shingles arrive is the any type of waterproofing coating i can put on the boards as a temporary fix as the shingles might not arrive for another week!

i was thinking of something like Thompsons Roof Seal,

would this do the job?

^woody^ · 24 May 2007

I would throw a £10 tarpaulin over it

cwm · 24 May 2007

will that cover 62m square

roof is 8.4m x 7.4m(laid flat)

adybuttress · 14 Jun 2007

Hi

Try a 1 piece rubber membrane that is guaranteed for 20 years. It simply glues down with a water based adhesive and is available from www.diy-flat-roof.com You will find them very helpful.

Morrisman · 14 Jun 2007

cwm said:
Hi,

i am currently in the middle of building a wooden workshop,
all frame work is done.

tomorrow the OSB boards are coming for the roof,the problem being,

if i put them up and it rains before the roofing shingles arrive is the any type of waterproofing coating i can put on the boards as a temporary fix as the shingles might not arrive for another week!

i was thinking of something like Thompsons Roof Seal,

would this do the job?

I guess your shingles are on now, but I thought OSB was fairly waterproof anyway? I've used it on my gable ends, and will cover it with pvc facia eventually. Jewsons told me it was for exterior use.

Deluks · 14 Jun 2007

Wterproof-ish, but if the ends get a good soaking they can swell up. I had plenty of fun and games felting my shed, about 5mm diff between adjacent boards. Had to shim it with offcuts of felt to get it to look flat.

noseall · 14 Jun 2007

most plywood sheet manufacturers will promise their products will withstand up to 10 weeks or so of being exposed directly to the weather. this is so that roof builders have a failsafe should prolonged bad weather prevent installation of the final roof covering.

this does not apply to chipboard roof sheets though.

Morrisman · 14 Jun 2007

Deluks said:
Wterproof-ish, but if the ends get a good soaking they can swell up. I had plenty of fun and games felting my shed, about 5mm diff between adjacent boards. Had to shim it with offcuts of felt to get it to look flat.

My sister had her kitchen extension refelted and found none of the original chipboard sheets actually met over rafters, just floated in mid air, which caused large odd looking ripples in the felt. She made sure that when the new sheets were put on they were cut properly and nailed down onto the rafters.

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Water proofing OSB?

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