House Internal wall insulation

[Foregoneconclusion]

Festuve greetings.. Considering insulating the walls of the old house i have moved into. Anyone had experience of doing this. What about damp in the walls .

What about external insulation?

Loft insulation needs a top up also but one part of the roof has no felt so I'm concerned about that too!!

Thoughts.

 

[George from SJM Planning]

I'm not an expert (wrong side of the company) but I believe Kingspan do insulated plasterboard

 

[Brains]

Best thing we ever did to our big cold farm house.
put roof felt membrane on walls then screwed lots of 4x2 to the walls. Planned bit off that to make the walls straight, then 70mm kingspan in between. Then plaster boarded.
Nice walm house now. we also dug floors out and 4” kingspan toped with under floor heating. I was given good advice to spend the money on insulation! Did it all but plastering myself. Also involved re wireing.

 

[davidroberts30]

Dont rule out external insulation and render

 

[Foregoneconclusion]

Dont rule out external insulation and render

Flipping Costly!
But alot less disruption..I am doing some research and sums.

 

[Foregoneconclusion]

Best thing we ever did to our big cold farm house.
put roof felt membrane on walls then screwed lots of 4x2 to the walls. Planned bit off that to make the walls straight, then 70mm kingspan in between. Then plaster boarded.
Nice walm house now. we also dug floors out and 4” kingspan toped with under floor heating. I was given good advice to spend the money on insulation! Did it all but plastering myself. Also involved re wireing.

Underfloor heating is next on the list!
How much wall did you take off first? Presumably you removed dry linings?

 

[WillH]

what we would do is hack everything off then a couple coats of ka tanking slurry, sbr/cement mix painted on (the slurry can react with gypsum) then dot and dab insulated boards on

or do like @Brains said and make a timber frame and insulate between and board onto it, might lose a few inch more which may or not be a problem which is what we did here seem to think there was a bit of a channel right at the bottom that went outside as well but can't remember exactly what was happening

 

[jamj]

I did walls of a house years ago with timber batons' insulated between and plasterboard on top.
Worked well, but I would wonder about the timber rotting especially if the wall is damp. Your screwing through any dp membrane that you put up.
Have also used the insulated plasterboard which is much easier and faster to erect. Disadvantages are that it does not straighten walls and harder to put fastenings on for eg hanging pictures.

I did solve the problems with the old house in the end, by knocking it down

 

[Hampton]

Festuve greetings.. Considering insulating the walls of the old house i have moved into. Anyone had experience of doing this. What about damp in the walls .

What about external insulation?

Loft insulation needs a top up also but one part of the roof has no felt so I'm concerned about that too!!

Thoughts.

What’s the house made of?

 

[Foregoneconclusion]

What’s the house made of?

Its rubble built. Not a brick in sight. 300 plus years old . Walls 500mm thick..

 

[br jones]

Look at wood fibre insulation

 

[Frodo]

Dont rule out external insulation and render

I looked at it for a cottage with pretty scabby walls. I thought it would solve two problems, but couldn’t find someone to do private properties. Most seemed too busy doing council houses.

 

[Hampton]

Its rubble built. Not a brick in sight. 300 plus years old . Walls 500mm thick..

Don’t cement render the inside then, it will need to breathe. Perhaps use a lime mortar if you want to bind it. Then 100mm insulation then plasterboard (or insulated plasterboard if you like, but when I priced up a job recently it was cheaper to do it separately. Then plaster.
I would batten rather than dab, but obviously that may be problematic getting strong fixings on a rubble wall.

 

[Hampton]

Its rubble built. Not a brick in sight. 300 plus years old . Walls 500mm thick..

Cob or sandstone?
My own is sandstone and we have insulated some rooms and it is very warm now.
I have double glazed it all, and probably won’t need to insulate any of the other rooms now as it is roasting.

 

[Tractor Tim]

You can get gun foam adhesive to stick insulated plasterboard on works out much better than dot and dab. I did see a neighbor get some one in to spray foam some really rough walls and then stuck plasterboard straight to it

 

[Foregoneconclusion]

Cob or sandstone?
My own is sandstone and we have insulated some rooms and it is very warm now.
I have double glazed it all, and probably won’t need to insulate any of the other rooms now as it is roasting.

It's local stone just wanged in there. Looks like some sandstone mixed with limestone and all sorts, some river stone as well which figures as we are right on the estuary.

So you just targeted some rooms? Did you top up your up your loft insulation? My loft is a mess of old asbestos insulation about 2 inches thick laid inside the cross timbers then more modern 100 mm or so laid across that at 90 degrees. The insulation hasn't been pushed into the tricky bits to get to so I think I'll go for another layer but fill in where it's absent.

 

[Foregoneconclusion]

Don’t cement render the inside then, it will need to breathe. Perhaps use a lime mortar if you want to bind it. Then 100mm insulation then plasterboard (or insulated plasterboard if you like, but when I priced up a job recently it was cheaper to do it separately. Then plaster.
I would batten rather than dab, but obviously that may be problematic getting strong fixings on a rubble wall.
[/QUOTE]
Yeah this is my feeling that the wall needs to breathe. The folks i have had in to quote use a dpm fixed to battens. See pic

I feel this may cause some problems..where does the damp from outside end up...? Or the rising damp?

 

[spanners and hammers]

i had the outside done on our solid wall house when there was a grant bout two years ago ,, it has made a lot of differance

 

[Chae1]

We stripped our wall in kitchen back to granite wall. Framed it off and packed frame with insulation and put plasterboard on top. Made a huge difference to our kitchen. Wish we had done it years ago.

 

[Kidds]

Just done my house, all external walls have been framed out and Celotex with plasterboard over.
Don't know how good it is yet but combined with new double glazing will hopefully be a big improvement.