On 23/05/2013 11:49, Peter Percival wrote:
I have inherited a shed made of cast (or moulded, whatever the word is)
concrete for the lower walls on which the rest is built of wood. (It
has a made-up as it was constructed look about it.) The wood is rotten
and I need to replace it. How can I attach the new wood to the
concrete? I could use screws--those things that expand against the hole
they are in when an internal screw is tightened--but that will leave a
crack 'twixt concrete and wood where the rain might get in. So I need
(I think) an adhesive cum sealant. Any suggestions?

I would be wary of using expanding fixing on thin section concrete -
there is a risk of just splitting or spalling it. You could drill the
concrete and insert threaded rods into resin, then use those for
mechanical fixing. Finally finish with a silicone sealant to make the
join waterproof while allowing for natural movement of the wood.

--
Cheers,

John.

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