On 21/04/2019 09:27, DerbyBorn wrote:
Nightjar wrote in
:

On 20/04/2019 17:16, DerbyBorn wrote:
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.


The roof is deigned to be waterproof, so you would need a system that
worked inside the roof space to do any good before the fire broke
through the lead cladding. That would have to be rather more
complicated than just a pipe on the roof.

Better IMO to rebuilding it on a metal framework, making inherently
non-flammable. The roof is relatively modern, so nothing would really
be lost by making it of modern materials, so long as it looked the
same from the outside.


...and there are no longer loads of forests of Oak Trees to build was
ships.

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.

If you get the chance, it's well worth visiting.