Here is another question asked by a member of the public relating to timber treatment. We hope that it and the answer, which we include below, are useful.

We have a large barn with quite badly damaged timbers with woodworm, dry rot and some areas of wet rot on the main A-frames and trusses. Would you reccommend the Timber Paste – 10 Litres or the  Insecticide/Fungicide Wood Preservative – Dual Purpose – 25 Litres?

Here's our answer:

For general spraying of timbers I would recommend you use Micro 8F/I. This is a water based concentrate which dilutes to 25 litres for use. If you have large cross section timbers that are affected then Timber paste gives you the deepest penetration of preservative.

If you have a question, that you'd like us to answer, please email John Oxley: john@constructionchemicals.co.uk

Construction Chemaicals offer a free 'Ask John' service and he will be happy to answer any questions you have.