51/...Pozzolan.

Hi everyone. I have recently purchased an unfinished Hartley 32 hull and have started work to finish it to hull deck and cabin stage. I am about ready to plaster the deck but I have drawn a blank on Pozzolan. Is this a brand name or a commercially available concrete additive. I live in Tasmania Australia, so if anyone could help me with some info it would be greatly appreciated. Love the forum by the way it has already helped me over some of the headaches from buying a 20 year old ferro hull.

Wayne Marshall...wmarshal@ozemail.com.au

 Hi Wayne, sorry I missed posting this to the forum when you asked before. Pozzolan is basically used to help improve the waterproofing of the plaster mix. Although we originally listed it on our plans and in our book, we haven't used it ourselves for many years to no detrimental effect. Whenever possible we use sulphate resistant cement (SR), instead of ordinary Portland cement. There is only a small difference in the price and it has several advantages. Not the least being the better protection of the galvanised netting/mesh.

Colin Brookes...colb@xtra.co.nz

 hi colin Thanks for the reply to my query.It saved me some headaches.I am working from a very old copy of your book,about 20-22 years.My book says to use a cement and water wash for a joining compound, I have heard mention that there are better ways. Would it be worthwhile to buy the book again in its most recent reprint.I have already ordered hartleys "new" guide to boatbuilding.

Wayne Marshall....wmarshal@ozemail.com.au

 Hi Wayne, the new book 'Ferro-cement Boats', is not a reprint, it is a totally new book and will give you the up-to-date info you want. Regards

Colin Brookes...colb@xtra.co.nz

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