I am thinking of replacing all of my windows and just wonder if instead of
having holes drilled all over my harled walls, is it possible or feasible to
have the insulation blown into the cavities when the old windows are
removed. Or perhaps could I get access to the cavity via the loft - is the
cavity wall insulation material sprayable so that it could be done this sort
of way? Just trying to plan ahead.
Before anyone on this side of the pond asks...
The typical size holes required for blowing in insulation would
seriously compromise the structural framing surrounding the windows.
So, no, it really can't be done that way. Access from above is
possible for the majority of the wall, but there will be areas where
that won't work (under windows, etc), and the hole size through the top
plates would still be an issue (and the location would make them
difficult to drill). With blown in insulation you have to decide
whether you want to perforate the exterior or interior of the house.
It can be a tough choice.
yea its kinda hard to say
there are 2 different methods
one is a foam that expands and fills the area
Personally i dont like that stuff because then the wall is solid foam
and you can never run wires or pipes without tearing iit apart
but there is the fiberglass and celulose material that can be blown
into walls. It is a good choice if you dont already have insulation
but it usually requires a hole at the top and bottom of the wall
so that pressure can excape as the wall is filled
going through the plates of the wall which are the horozontal
top and bottom parts of the wall is not pratical for many reasons
first lumber isnt supose to have that large a hole cut in it and if you
do cut a hole for a pipe then the rest of the plate is still in tact
if you are putting holes every 16 inches in the plates then you
will tare apart the structure of your house and a good wind
or snow will blow it over
so i am not really sure what the best method for you is but you can
bet that many people in your area have had the exact same thing
done to their homes.
so contact someone that has done it before and ask if they can
let you go see a house they did it to. Or ask some neighbors
they can put holes on the inside or outsides of buildings and if you
have stone then you are more limited.
Its not rocket science but you do need skill to do it cleanly
I would worry most about getting the area right arround the
window sealed and for that you can use either foam in a can
or stuff the area with fiberglass insulation
Bob, thanks for your thoughts. As I suspected I don't think there is a
simple alternative to drilling holes all over the outside walls. Rather
annoyingly the house underwent major (interior) renovation just a year ago.
If we had thought about it then, we could have had it drilled/injected
through the inside walls. There are a lot of housed in the area who have
had this done, but all seem to have it installed through drilling the
outside walls. I thought it might be useful to ask here first, for
alternatives before speaking to the insulation companies. I will also
investigate the fibreglass alternative.
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