One boiler or two?

[dancinplumba]

Can you elaborate?

Yes, you say solid walls don't lose heat then say you have insulated plasterboard ? Why ?

 

[DirksPlumbing]

Yes, you say solid walls don't lose heat then say you have insulated plasterboard ? Why ?

Dew point, thermal mass?
And I have not specified it for this house, you may need to talk to the architect about making decisions like that.

But you are aware how to calculate a thermal resistance?
What is better, a reasonable insulating wall or a great insulating wall?

 

[Idealhater]

As the non expert here can I say that I never understood Dirksplumbing to be saying that solid walls don't lose heat - merely that some solid walls lose less that you might think. A 700mm stone wall that is dry and breathing properly is probably reasonable but could be made better by proper insulation. But incompetent insulation could prevent it breathing and make matters worse. I'm now clear that for me getting a reliable boiler and improving my windows is the best investment - my walls are reasonable but will never be great.

On the other hand my son has a Victorian house with a single brick thick extension which was freezing in winter and baking in summer, despite double glazing. Celotex lining and plasterboard has transformed it.

 

[DirksPlumbing]

As the non expert here can I say that I never understood Dirksplumbing to be saying that solid walls don't lose heat - merely that some solid walls lose less that you might think. A 700mm stone wall that is dry and breathing properly is probably reasonable but could be made better by proper insulation. But incompetent insulation could prevent it breathing and make matters worse. I'm now clear that for me getting a reliable boiler and improving my windows is the best investment - my walls are reasonable but will never be great.

On the other hand my son has a Victorian house with a single brick thick extension which was freezing in winter and baking in summer, despite double glazing. Celotex lining and plasterboard has transformed it.

Well I must have expressed myself wrongly then. It was never my intention to say that massive walls do not loose heat. Just the wall thickness has a massive influence on the insulation value.

For example a 3ft massive wall (granite) has a better insulation value than a traditional brick wall with 50mm cavity.
A massive sandstone wall can do that at around 2ft already.

 

[Idealhater]

That's what I thought you meant. You were quite clear but I think dancinpluma misunderstood or disagreed. I'm with you and thanks again for the input.