I had my corrugated cement / steel purlin roof of my barn, which I was
turning into a workshop, foam sprayed 9 years ago and it has been absolutely
excellent. We aimed for 100 mm on the roof and 75 mm on the walls, which
were then faced with 18 mm OSB3. about 40 x 40 foot and it was around £4K
My only regret is that they failed to seal the apex properly leaving a gap
that the occasional bird gets through. It has made an enormous difference to
the comfort level.
Yes its not very breathable falls off pushes off tiles and pongs lot as
well. bah humbug. My loft however is open to the elements, ie you can, if I
could see see out between the times. It seems that no lining was ever fitted
as there is no evidence of fixings. The good thing is that it does not have
rot, the bad thing is the wrong type of snow powdery, gets in.
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On Friday, October 19, 2018 at 1:50:10 PM UTC+1, Muddymike wrote:
If its the foam that you refer to is the one that is sprayed to the back of
the roof, tiles and lath, it will be the biggest mistake you'll make. If y
ou ever have to do a repair or a slate or tile gets broken, its a very expe
nsive job to do, that if any roofing company will take it on.
My neighbours' house has this spray on insulation but when it was
done the neighbour at the time was sold on it as a cheap method of
stabilising a slate roof reaching the end of its life with more slipping
slates each year. I avoided the "we are next door and can give a
substantial discount if you sign up today" offer for the same service.
When I had my roof replaced a hidden gutter had to be installed between
my roof and my neighbours roof (terraced property). My roofer wasn't too
pleased when he found that my neighbours slates had been glued down with
foam when removing them to install the gutter. My roofer commented on my
neighbours roof as a property to avoid if ever asked to quote for any
work on it.
 Foam sprayed to the underside of the slates gluing them to the
On Friday, 19 October 2018 23:55:54 UTC+1, alan_m wrote:
k of the roof, tiles and lath, it will be the biggest mistake you'll make.
If you ever have to do a repair or a slate or tile gets broken, its a very
expensive job to do, that if any roofing company will take it on.
It makes the slates impossible to get off in 1 piece and re-use. It also tr
aps water against the timbers & makes them impossible to inspect. A crazy i
Same situation with my brother's roof - neighbours had been sprayed
with this stuff, but fortunately my brother's hadn't.
When the roofer did my brother's, he warned him that if he spoke to
the neighbour about having his done, it would be *much* more expensive.
Reason is that it apparently takes 10 times longer to strip the roof,
and only then will you find out how much of the structure (e.g. rafters)
needs replacing. Also, old roof tiles can't be used as hardcore as they
can't be separated from the foam and battens, and you end up paying to
landfill them, and the volume is always very large.
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