in a prevoius piost i've been convinced of the merits of insulating an
exterior wall (even tho i can't insulate along the entire length) ...
so what is the best way to do this

i was planning a timber stud frame, attached to wall and ceiling about
1-2" from the existing (12" stone and lime plaster wall) to leave an
air gap.
then insulating between the battens (rockwool? or rigid board?)
then a vapour barrier / plasterboard? or thermal board?
which would be best?

.... what i cant quite get my head round is how to i run electrics.
normally they could run in the cavity formed by the timber frame - but
if this is filled with insulation? there will be space behind the wall
but then this barrier would need to be broken to run the wiring
through...

thanks in advance

wrote:
in a prevoius piost i've been convinced of the merits of insulating an
exterior wall (even tho i can't insulate along the entire length) ...
so what is the best way to do this

i was planning a timber stud frame, attached to wall and ceiling about
1-2" from the existing (12" stone and lime plaster wall) to leave an
air gap.
then insulating between the battens (rockwool? or rigid board?)
then a vapour barrier / plasterboard? or thermal board?
which would be best?


Rigid board expensive but best. If only 2" to play with use it.

... what i cant quite get my head round is how to i run electrics.
normally they could run in the cavity formed by the timber frame - but
if this is filled with insulation?

Well make some channelss in it.

there will be space behind the wall
but then this barrier would need to be broken to run the wiring
through...


You will alwyayts have that. If you use celotex its double skinned with
Al. anyway.

Vapour barrier like insulation (don't stop heat) doesn't entirely stop
moisture - simply gets it down at a a level it wont cause trouble at.
I would definitely fill the studwork with taped down celotex, then gouge
out wiring channels, lay the wires and plasterboard over. The celotex
and tape will form the vapour barrier.



thanks in advance

wrote:
in a prevoius piost i've been convinced of the merits of insulating an
exterior wall (even tho i can't insulate along the entire length) ...
so what is the best way to do this

i was planning a timber stud frame, attached to wall and ceiling about
1-2" from the existing (12" stone and lime plaster wall) to leave an
air gap.
then insulating between the battens (rockwool? or rigid board?)
then a vapour barrier / plasterboard? or thermal board?
which would be best?

... what i cant quite get my head round is how to i run electrics.
normally they could run in the cavity formed by the timber frame - but
if this is filled with insulation? there will be space behind the wall
but then this barrier would need to be broken to run the wiring
through...

thanks in advance

Drill holes through the timbers and feed cables through in front of the
fibreglass.