ONY wrote: »
Hi, Renovating a detached bungalow built around 2001. 100mm cavity walls with 50mm insulation. Roof insulation will be upgraded along with all windows and doors. Inside is plasterboard blobbed on to bare block.
We are considering dry lining for now with up to 100mm on battens. With a view to possibly pumping and wrapping the walls externally later on. What option would you take for wall insulation?
Penn wrote: »
Your insulation is always best in one continuous layer. If you dryline now, you'd be better off removing it later. I'd be inclined to push external insulation now if possible.
ONY wrote: »
Hi Penn, What would you suggest on the inside walls in the above case please?
rn wrote: »
Actually I've that gable end problem with my house. Have to say we haven't noticed it, but it stacks up theres a cold bridge into a cold area. You'd nearly need a row of thermo block at ceiling height or make the attic a warm space to counter it.
listermint wrote: »
All to often I think people run after the wrong approach because the results aren't what they expected. E.g getting ewi done I won't have to run my heating at all. Or the house will be instantaneously warm night and day difference.
The do the wrong things and throw bad money after good.
With EWi it can quite easily defeated by poor air tightness into a cold attic space.
Also the impact of an attic gable especially on a bungalow into the rooms below which will essentially wick the stored heat right out of that room. Has people question why they did EWI in the first place.
A real holistic look at entire envelopes has to be done and no single solution actually gives you that silver bullet. There's a case to be made for dryling a gable attic or room below wall if the attic space is a cold one. But you wouldn't dryline other walls as it removes the ability to store heat in them with externally EWI holding it back.
Ewi is great but all other aspects to assist it must be looked at and addressed.
ONY wrote: »
I’m guessing a hipped roof doesn’t pose the same problem as the block work is completely covered with EWI?
Back again, we’ve now opened the cavity and can see there is 50mm of polystyrene in the cavity but it’s not great. Fairly broken up and lots of cement from the block work. We were planning on pumping the walls then wrapping. Pumping doesn’t seem to be an option now, so we are back to dry lining or EWI leaving the cavity as is. Bare block work has been sand and cemented.
There is so much conflicting advice that I’m not sure which option will work the best. Will externally insulating create a thermal loop in our case and we should therefore dry line instead?