"Andy Hall" wrote in message
...
On Sat, 3 Jun 2006 17:32:39 +0100, Adrian C wrote
(in article ):

wrote:
Thanks to all on this thread. The roof is not in bad shape, some
re-nailing here and there. This saves fortune on new tiles and felt.

We have a Victorian roof with no felt. The clay tiles occasionally slip,
and I've been able to right those from the inside, so far.

Thinking about getting the roof overhauled using the same tiles, and
then getting http://www.warmroof.co.uk to bond it all together with
foam, to cut down on further slippages and add some insulation. We can't
have much traditional insulation over the ceiling, the ceiling joists
don't allow much depth and we still want to use the loft space for
storage.

So this is our solution, not keen on the expenditure on a new roof,
heavy concrete tiles, problems with the adjoining b****** neighbour
etc...

-)



This is an *exceedingly* unwise idea, Adrian.

The foam treatments have a number of negative impacts to a roof
structu

- Any leaks or water ingress that occurs through cracked or slipped tiles
etc. or simply blowing in will result in water being trapped in contact
with
timbers.

- Ventilation of timbers will be substantially reduced and together with a
supply of water, you will have created the perfect condition for rot to
take
place.

- It becomes impossible to inspect the roof structure for problems,
further
deterioration etc.

- It also becomes impossible for a surveyor to assess the condition of the
roof and he will mark that in a survey report to potential future
purchasers.
- You will significantly reduce the marketability of the property. Have
a
chat with a few people with knowledge of the property market and see what
they say.


Personally I would walk away from any property that had had this done,
whether it was well intentioned or not. It creates an unknown situation
for
the buyer whereby the only way to be certain of the integrity of the roof
structure is to rip off all the foam. Generally the only way to do that
is
to rip off the tiles and battens as well - in other words do the
re-roofing
job that should have been done in the first place.

I have commented on this type of roofing solution before. The above comments
are 100% correct.
If you intend on reusing the original tile with this spray you will regret
it. How old are the original tiles, if you say they are slipping why ? as
the tops of the tiles deteareated, it wont belong before the tiles start
coming loose further down the length. If any one goes on the roof to say
point a stack or renew a TV aerial and break a tile. Its near imposable to
get a tile out. The only way is to cut away the spray insulation from
inside, because every things bonded together. All this is from my own
personal knowledge being in the roofing trade for more than 50 years. The
Federation of roofing contractor don't recommend this product.

K S Nottm