Tanalised sheds and other garden buildings

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I recently bought an 8x6 garden shed from a reputable manufacturer. It cost £750 for the shed, including erection, and I built the base myself which was another £100.

I have had terrible problems with damp coming through the timber cladding (not through the joins). More recently the timber cladding has started to shrink with some gaps being 6mm out of a 10mm overlap on the tongue and groove. The manufacturer has now agreed to supply and fit a new shed. He suggested that I have an untanalised one as (he claimed) the tanalising process can cause, in some cases, excessive shrinking. He said that provided I treated the untanalised one on a regular basis it would make no difference to the longevity of the shed. I've spoken to a couple of other people in the shed business and they seem to be agreeing with that view. As I treat my buildings and other garden timbers every year I agreed to it.

Tanalised fencing is different, I think, as it doesn't matter if you get a bit of shrinkage.

Any thoughts on this?
 
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