solid walls, limeplaster & internal insulation

[Liz Fry]

We are in the process of painstakingly removing all the the multitude of polysterene wallpaper & cement layers from our solid wall cottage........

During this process my mind keeps drifting to the "what I am going to do when I FINALLY remove it all" scenario. The rooms aren`t particularly big........but we would like to add some sort of insulation if we can.......... I am presuming that sheepswool is probably the order of the day here........together with a limeplaster finish.

I presume that we will need some sort of pressure treated studwork to house the insulation and then lathe & limeplaster. I am hoping that someone can give me a bit more info on the hows of such an activity............... Ie is there any particular type of studwork that should be used, can the studs be fixed directly to the stone wall or is some sort of membrane required at the point where the stone touches the timber?, is an air gap required somewhere (either before or after the insulation), how much of a gap is needed to allow the plaster to form a key before coming into contact (or not?!?) with the insulation.

Oh...and if someone has an creative ideas on how we tackle plastering around the windows...........

hopefully there is a picture attached to this post somewhere..........

 

[Liz Fry]

or not.......

try this instead
http://www.trailend.co.uk/living room.htm

any comments would be gratefully received.

kind regards

Liz

 

[arthurw3]

CCA treated wood battens with 100mm of polystyrene, polythene vapour barrier and 12mm plasterboard would be my first try. You should also insulate in the window reveals as well to avoid cold bridging, all this assumes that you have managed to get some sort of DPM in the floors and checked that you have reduced the damp in the wall as much as possible by checking the outside ground level, gutters, downpipes, wall condition and pointing.

 

[Mark]

For internal insulation, I would say either

1) couple of coats of hemp/lime plaster several inches thick. posibly using leca in the mix.

2) batten the walls at 30cm intervals. Fit kingspan or celotex sheets (not polystyrene - its not as good an insulator and is a bad idea in a fire) over the battens - leaving an air gap between the wal land the insulation the thickness of the battens (about 1/2-3/4 inch?) then either board (clay or readboard?) or rebatten and lath. then plaster.

Could you insulate the outside? If you've got concrete render rip it off and put hempcrete on instead.

Look at the thermal performance of insulation. Sheepswool, rockwool, polystyrene are all not as good as kinspan (twice the thermal conductivity)

 

[Nemesis]

I'd consider carefully if it will be worth the effort and cash.

Also - small rooms with space removed by adding insulation makes for smaller rooms, and think about doors, windows etc - how are they going to look?

It will also make the rooms have very flat walls, which may look rather lacking in character. Think Barrat box.

I'd stick with the lime plaster.

DPM in floors is a debateable point, if a solid floor I'd go for limecrete from Ty-Mawr.