Has anybody used a DIY spray foam kit to insulate their roof from
inside the loft? Cost and "physicality" is an issue, hence the thought
to use a spray kit, but is the stuff any good?
An alternative would be stapling some sort of membrane across the face
of the batons but I can't seem to find the right Google words to track
such a thing down.
Any help appreciated, thank you.
I think that roofing experts generally condemn the use of spray on foam
as a solution to roof and loft insulation. I once insulated a loft of
house of mine - that didn't have any felt under the slates - by nailing
strips of felt on the inside. I did this by fitting it snugly to the
battens and nailing it to the rafters on either side - it was quite
It is important to use a good quality 'breathable' felt.
It will raise concern with any surveyor when you sell too.
It's normally only done when a roof is at the end of its
life as a stop-gap, and this is what the surveyor will have
to assume being unable to see the roof structure anymore,
so it will likely knock something like the value of a
replacement roof off your house.
[email address is not usable -- followup in the newsgroup]
On 1 Jul, 18:23, firstname.lastname@example.org wrote:
Without knowing exactly what you are trying to achieve I would say you
would be wasting your money particularly if you are trying to comply
to b/regs standards.
For a flat ceiling over a bedroom the the insulation needs to be
laying between and over the ceiling joists.
If you have sloping attic ceilings, ie a loft conversion or loft room,
the insulation should be between and under the rafters.
If you explain your intentions more clearly I can give you more advice.
I want to insulate the attic roof, hence my original query, the loft
foor is already done. Personal physical issues mean spray foam was a,
seemingly, attractive option but the answers already given have
pointed me in the right direction, thank you.
On Wed, 2 Jul 2008 00:52:20 -0700 (PDT), a particular chimpanzee,
email@example.com randomly hit the keyboard and produced:
If the answers have pointed you in the direction of that Screwfix
link, then you need a new compass too.
It MAY be a possibility, but you have to look at two things:
First, this won't meet current B/Regs requirements, so if you are
doing a legal loft conversion, then you will have to alter it.
Secondly, you need to ensure that there is sufficient ventilation over
the insulation. If you have no existing felt there may be enough
coming through the tiles, but if there is felt already there, or if
the tiles are close-fitting or interlocking, there may not be enough.
You need to leave a gap of between 25-50mm over the insulation,
depending on whether there's any sag in the felt and the amount of air
"If no-one on the internet wants a piece of this,
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