Chris Bacon wrote:
On 11/06/2021 16:45, Tricky Dicky wrote:
Can anyone advise me on the suitability of fixings in particular screws for Tanalised timber?

I have looked on the Lonza site and downloaded their user guide to working
with tanalised timber and it seems there are two recommendations either
stainless steel screws or galvanised screws. Stainless steel is out on
cost grounds it is only a shed I am putting together. The Zinc coating
on galvanised screws is regarded as a sacrificial layer so the thicker
the coating the better. I have had experience with galvanised screws having
secured some palings on a fence with hex head BZP coach screws the idea
to be able to remove palings for maintenance reasons. When I did remove
them the screws were rusted on the threads but not rusted through.

So how do the likes of Turbogold, passivated Zinc and some of these other
green and blue coated screws cope having been driven into tanalised timber?


Dunno, but BZP is not galvanised, or anything much like it. If it's a
shed, it's not going to be permanently wet, I hope. What screws do you
need for what purpose? If it's something like screwing the sides/ends to
each other and the roof/floor, you could surely use stainless, or even
brass, with some other cheap BZP or whatever for other purposes.

My sheds have outlasted any non stainless screws I put in them when we
first came here (22 years or so ago). I'm now replacing the rusty
husks of non stainless screws I put in 15+ years ago. The stainless
ones I have been using for the last 15 years or so are still perfect.

Apart from anything else it means you can dis-assemble things and
re-use the screws! Admittedly there are some losses because stainless
screws are rather less robust that non-stainless but I'd guess 90% or
so are re-usable.

--
Chris Green
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