Last year I bought a B&Q small weatherboard shed and the boards are so thin
that where there are knots in the wood ,daylight shows through.Im having a
problem with dampness which shows on the floor and am having difficulty
actually pinpointing exactly where water is getting in.
I have already applied preservative on outside but am wondering if there is
some sort of sealant that can be painted on top now so that I can rule out
any seepage in from the wood.
I have looked in DIY stores but cant find anything along that lines or any
different to the preservative used.
I would appreciate any suggestions.
Shed is erected on paving slabs so I dont think it is coming up from
ground.There was a drip coming in at the window but I have stopped that.The
felt roof is sound and I have sealed al the joints where the sections meet
at the corners.
The floor is some sort of treated chip board so wont stand a lot of
water.The water is not lying in pools ,just dampness on the floor along the
sides.I suspect seepage at knots or at overlaps in weather board
Make sure that the bottom board actually goes past the floor to allow the
water to run off. What about the doorway, does the door drop below or above
floor level? If above (rare), then it's possible for rain to be blown in
through the gap.
With regards to preservatives, I use Sadolin which forms a nice slippery
surface for the water to run off. This is not the cheapest by far, being
around 30 quid for 2.5 litres for use on planed timber. Using three coats
of this, I can get at least a five year re-coat on my shiplap boarded shed
with no problems at all.
We had leaky old shed - I couldn't really see where water was coming from.
I put a gutter up to catch roof water and applied some waxy type of
preservative from a tin from B & Q. Problem solved (even 3 years later).
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