motaring/plastering interior walls

[Gyn_Paul]

I'm just about to embark on the great attic project: first job

is to treat the two end walls which ajoin the barns (ours is a

barn-house-barn sandwich). the aim is to coat the stonework - which is

very rough - with something which will fill the gaps and render it

ABSOLUTELY impermiable to anything with either wings or four feet and a

tail. The finish doesn't matter because it will be covered with

insulation bats and then rail and plasterboard.

I had though to motar it with sand and cement, but am now wondering if plaster has any advantages (easier and/or cheaper?).

Anyone been down this road?

If plaster, is there a certain type or number which would be more

appropriate to use in high temperatures? - it's an August job and

today, for example, it's 32C at floor level, and 46C up near the apex

under those damn black ardoise.

p

[Dave&Olive]

hi

ok you want to throw a wetish mix of 1part lime 1 part cement and 5.5 parts sand on it ,spray the walls first with water , leave an air gap between the wall and the insulation and vent it to the out side .If you use plaster it will absorb the damp and fall off in time

              Dave

[LEO]

[quote user="Gyn_Paul"]I'm just about to embark on the great attic project: first job is to treat the two end walls which ajoin the barns (ours is a barn-house-barn sandwich). the aim is to coat the stonework - which is very rough - with something which will fill the gaps and render it ABSOLUTELY impermiable to anything with either wings or four feet and a tail. The finish doesn't matter because it will be covered with insulation bats and then rail and plasterboard.
I had though to motar it with sand and cement, but am now wondering if plaster has any advantages (easier and/or cheaper?).

Anyone been down this road?

If plaster, is there a certain type or number which would be more appropriate to use in high temperatures? - it's an August job and today, for example, it's 32C at floor level, and 46C up near the apex under those damn black ardoise.

p

[/quote]

From the info provided so far ,

it sounds like you are talking about two adjacent internal walls (ie. niether of these walls are exposed to external elements)

I would be thinking of dry-lining these walls without rendering or plastering or even without insulation!

after all they are internal walls!

and you are not located on the Outer Hebrides.

[Dave&Olive]

hi

ok and oops Leo  you are right never read the post properly . Just thrash on some rough render like this with multi-bat

[IMG]http://i83.photobucket.com/albums/j311/daveolive/Pdr_0146.jpg[/IMG]

Dave

[Gyn_Paul]

[quote user="LEO"]

From the info provided so far ,

it sounds like you are talking about two adjacent internal walls (ie. niether of these walls are exposed to external elements)

I would be thinking of dry-lining these walls without rendering or plastering or even without insulation!

after all they are internal walls!

and you are not located on the Outer Hebrides.

[/quote]

They are internal walls - party walls, in

fact, between the barns and the house... about 60cms thick at the base, and

some 25cms at the top , so by the time the walls are at the floor height in the

loft they are about 40cms, tapering to 25 where the roof timbers are embedded

in it.

Damp is most certainly not an issue - indeed quite the reverse. With such high

temperatures the motar is turning to dust and falling out, so something needs

to be applied to the stones to retain the integrity of the structure.

And having had infestations of lérot (sp?) in the walls lower down the house

there's no way I'm just going to just dry wall it and forget it, I've got, a)

far too vivid an imagination, and b) far too good hearing!

p