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There's been a bunch of threads recently about heat pumps, solar etc etc so here's another one 😉
We're about to move into an old (~1900?) end of terrace house and I'd like to insulate it as much as possible, especially as we're doing a bit of building work anyway.
External insulation is not an option for various reasons, so I'm looking into sticking internal insulation on all the walls. Would love to hear any particular experiences from anyone who's had this done.
One thing I was wondering is, is it worth it to do a partial job? Don't really want to lose space from the fairly small rooms upstairs, so was considering putting the proper stuff downstairs and only using thermal wallpaper upstairs, something decent like this.
Better than nothing, or will it cause weird issues with the imbalance?
I've done a partial job in the bedroom. It's got two outside walls, one has a bay window, so I've insulated the flat wall only. It's made a big difference. That wall was a cold sink and the room is much warmer now. We don't have the heating on much, but it does feel nicer than it used to, especially in the morning. The rest of the house is mixed with old, uninsulated parts and new extension with thick insulation. Doesn't really feel unbalanced, we just heat the insulated spaces less. I'd be pretty doubtful of that wallpaper doing much though.
Is there definitely no cavity? Our house was built 1902 and has cavity walls which were filled by the previous owners. The house gets ridiculously toasty in winter for very little gas use and holds the heat extremely well.
But yes, to answer your question - you can get drylining with insulation attached. Indeed when someone I worked with was renovating the house they bought building control insisted on 50mm insulated drylining...
Do read up on how/why/risks, if you haven't already.
https://cat.org.uk/info-resources/free-information-service/eco-renovation/internal-wall-insulation/
https://www.greenbuildingstore.co.uk/information-hub/internal-wall-insulation/
https://www.soprema.co.uk/en/gamme/insulation/pavatex
I've fitted Pavatex to our old Sheffield house, and it made huge difference. This was front elevation, which had old bay downstairs and two windows upstairs.
I did the external walls in the bathroom and toilet in the upstairs of the offshoot in our old house which was mod terrace.
Also did ceilings and short walls in the dormer rooms at the top. Massive difference and well worth it.
Kingspan and Celotex websites show you how to lay it up. Use phenolic foams (whichever brand) not white foam or rockwool as it is nearly twice as insulating per thickness.
Standard for retrofit was 50 mm phenolic foam, more if you want to get to modern house standard.