"Marland" wrote in message
...
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.


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

Yeah, no rust in my metal decking except where the bleed from the
evaporative air cooler gets on it and that water is very salty because
the cooler by its evaporative action concentrates the salt in the water.
Thats why the bleed is there. Thats been there for 45 years now.

Metal decking doesnt have any nails thru it, its got galvanised
clips under the decking that are nailed to the rafters and the
decking interlocks with each sheet and it button punched so
that the vertical ribs in the decking grip the clips underneath.

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.

On Tue, 23 Apr 2019 10:31:22 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:


Yeah, no rust in my metal decking

FLUSH the self-important, self-opinionated, senile asshole's latest
troll****

--
Senile Rot about himself:
"I was involved in the design of a computer OS"
MID:

On 22/04/2019 17:04, Jethro_uk wrote:
On Mon, 22 Apr 2019 16:31:24 +0100, charles wrote:

In article ,
Jethro_uk wrote:
On Mon, 22 Apr 2019 12:52:18 +0100, charles wrote:

In article ,
wrote:
On Sunday, 21 April 2019 09:33:32 UTC+1, mm0fmf wrote:
I visited the roof space on Lincoln Cathedral a few years. The
tour cost £3 and was possibly the best £3 ever spent. Similar
general age to Notre Dame again with a wooden framed roof made
from huge oak beams. To ensure they have suitable beams for
renovation work, they have unused beams ageing in the roof space
ready. They've been buying them whenever they had money and such
wood was available. Of course a fire in the roof space would
destroy their own spares too.

Apparently an Oxford college was looking round for some replacement
oak beams when it discovered it owned a small woodland somewhere and
there were some 500-year-old trees that had been planted when the
college was built, for that purpose.

That's planning ahead.

At Balmoral, a few years ago, a new wood was planted and the factor
(land agent) said harvesting would happen in about 500 year's time.

Assuming it's been pollarded (?) and attended to correctly ???

pollarding oaks? I don't think so.

Hence the "?". But I'm sure there's more to providing the timber suitable
for such buildings (or the old oak built ships) than leaving a few acres
untouched for centuries. So my point stands. If you lose that skill,
you've lost the timber.

Oaks grown close togther are long tall and straight.
Oaks grown alone start to branch as soon as they get above deer browse
level.

If its beamns you want, cut the low branches off.

Or plant close togther.

For knees, plant alone..



--
"First, find out who are the people you can not criticise. They are your
oppressors."
- George Orwell

In article , Bill
scribeth thus
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?

Did indeed, stand corrected!..


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.

--
Tony Sayer


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

Give him a keyboard, and he will reveal himself.

In article ,
scribeth thus
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

Dunno re that, was looking at some steelwork been in use 70 years looked
mint the steel underneath. They might have better coatings these days
anyway!...

--
Tony Sayer


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

Give him a keyboard, and he will reveal himself.

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.

On 23/04/2019 12:47, tony sayer wrote:
In article ,
scribeth thus
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

Dunno re that, was looking at some steelwork been in use 70 years looked
mint the steel underneath. They might have better coatings these days
anyway!...

galv will last as long as the zinc takes to get used up.

And thats is a function of how exposed the steel underneath is.


And the water/air exposure

--
Of what good are dead warriors? €¦ Warriors are those who desire battle
more than peace. Those who seek battle despite peace. Those who thump
their spears on the ground and talk of honor. Those who leap high the
battle dance and dream of glory €¦ The good of dead warriors, Mother, is
that they are dead.
Sheri S Tepper: The Awakeners.

DerbyBorn wrote in
2.222:

I realise the risks with sprinklers and the very high cost of their
instalations - but surely a simple dry riser to a few strategic jets -
fed by water from the fire brigade could be a fast response solution
where high reach appliances take a long time to be deployed and may
not be high enough.

Imagine a pipe on the roof to act as a big sprinkler - early
deployment would have killed the fire. Cost - some pipes.


I suppose something like the instalation on an Aircraft Carrier Deck

That steel that protects itself with a thin layer of rust seems popular for
bridges now.

On 23/04/2019 16:34, DerbyBorn wrote:


That steel that protects itself with a thin layer of rust seems popular for
bridges now.


Quite a lot of box girders on bridges have no protective coating on the
insides even though they would be prone to condensation.
They now fit dehumidifiers and keep the humidity below 60% (IIRC) as
steel doesn't rust then.
Its cheaper and lighter than paint, etc.

In message , The Natural Philosopher
writes
On 23/04/2019 12:47, tony sayer wrote:
In article ,
scribeth thus
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
Dunno re that, was looking at some steelwork been in use 70 years
looked
mint the steel underneath. They might have better coatings these days
anyway!...

galv will last as long as the zinc takes to get used up.

And thats is a function of how exposed the steel underneath is.


And the water/air exposure

I understand that it's exposure to sulphurous fumes that does for hot
dip galvanising. Not in a cathedral, surely. :-)

https://tinyurl.com/y3r2zaot

gives a set of pics of the hot dip process, I'm fairly sure at the place
that did my metalwork.
I wonder what happened to the car.
--
Bill