In article , Marland
scribeth thus
wrote:
On Monday, 22 April 2019 22:56:20 UTC+1, newshound wrote:
On 22/04/2019 21:48, tabbypurr wrote:
On Monday, 22 April 2019 20:10:25 UTC+1, Bill wrote:
In message , tony sayer
writes

However now that the damage has been done thin "ish" section Steel cold
dipped galvanised roof trusses and a coated ally roof materials .

Surely you mean hot dipped galvanised?

Painted to protect it from acid and sulphides in rain, that should last
for ever.
Not totally sure about coated ally, having had two Land Rovers.

'Well we tried to cold dip it, but encountered some resistance'

Galv is good but no hope of it lasting a century, let alone several.


NT


What do you think is going to happen to proper hot dip galvanised struts
inside the dry roof space?

condensation.


NT


A lot of people judge the effectiveness of galvanising by the state of
galvanised Iron Sheets on a barn or shed after a couple decades. What has
often happened with them was the coating was damaged upon installation by
nails banged through them or rough handling exposing the steel underneath.
Handled properly it should last a really long time but in a large building
it would be inevitable that eventually some tradesmen would drill a hole
for a cable,pipe or to fasten something.

GH



This is proper Galvanising around 1959 "ish" around 2:50 in..

The said structure is still sound

http://www.eafa.org.uk/catalogue/861
--
Tony Sayer


Man is least himself when he talks in his own person.

Give him a keyboard, and he will reveal himself.