mm0fmf wrote in :

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.


Thanks - hope the weight isn't a problem. Would enjoy that tour. I like
to go behind the scenes.