Internal wall insulation... silly question... all walls?

Hello everyone, long time reader etc.

We're about to insulate the internal walls of our house.

I've ordered the Kingspan sheets and read up on how to do this for the last week, we're going with the warm batten/foam sealant method so the vapour barrier is as good as can be.

Here is the silly question... do we do ALL the internal walls? Or just the ones which face outside?

I've searched all over and can't get a 100% answer here, some photos I've seen show all the walls of rooms being done, others just the external walls.

This is a detached, old house and we want the best possible results (and only want to have to do all this once!).

Thanks,

Craig

 

Yes, just the ones that face the outside.

As you are trying to prevent heat loss, and the rooms of your house should all be pretty much the same temperature, there's no point insulating walls which have two internal faces.

 

I see, that would be if we're running a simple on/off heating system for the whole house?

We tend to only heat the rooms we're in (we have installed a heating system which allows us to control this room by room).

What I'm thinking about is the bedrooms we don't use etc. might it be worth putting insulation on one side of each internal wall so at different times of the day we're not heating rooms we're not using?

Or would this lead to potential problems?

 

If some rooms are deliberately kept colder by insulation, you might get condensation problems.

 

I'm not sure it would be worth it. I don't think it would be cost effective and would take many many years to pay you back.

Plus you will lose more space.

And you will still have a big uninsulated opening in the shape of a door (unless you insulate that too!)

 

Thanks guys, that does make sense. We had looked at insulated doors but we just love the look of the old lock&keep doors too much!

I would imagine insulated versions of those would be mega money.

I'll just insulate around the porch internally as it's too narrow to do from the inside.

Not looking forward to the wall with wood panelling

 

Thought I'd grave dig this thread with an update.

I've finished half the house.

Wow. I'd read the reports of how good this stuff could be when done right, but we didn't expect this.

The heating is using well under half what it was before this was done (and we still have -2 nights here, Pennines) and essentially the heat we got at 20 on the thermostat is now what we get when it's set to 16.

My current estimate is that we're only using about 35-40% of the energy we were using. This is incredible.

Totally amazed. Total cost for half the house ~£500.

Wish I'd done this years ago... but of course insulation was more expensive and heating cheaper then. We all reach our limits

PS I bought it all from an insulation website which was very cheap, however a well known trade shop said they would have beaten the price if i'd gone in with the quote, worth knowing.

 

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