Insulated panels on internal ceilings?

Pique

Hi,

I live in an old farmhouse with a hipped roof. The attic comprises the central 1/3rd of the overall ceiling footprint upstairs. The rest of the ceiling being the sloped part of the roof, where there is no space for insulation. Essentially, most of the ceiling is uninsulated and come winter is impossible to keep warm.

I am thinking about getting insulated wall panels installed on the ceilings upstairs. From what I can gather, this is do-able.

What thickness would be recommended, and what types are suitable?

Also, an idea on the cost of the materials per m2 would be helpful if possible.

Thanks!

Calahonda52

what is the finish on the ceilings now?

Pique

Calahonda52 wrote: »

what is the finish on the ceilings now?

Just the original painted plasterboard.

Calahonda52

Right, so slabbing the ceiling as is with IB will bring the dew point inside the existing and you will get mould growth on the paint.

Pique

Balls. So you mean it would grow on the current ceiling behind the proposed IB?

Can this be prevented or avoided? Presumably it can if they boards are sold as being suitable for the task.

Calahonda52

Yes re balls
The IB is being sold as an insulation solution, without any warranty on what it gets used for.
Is it normal pb or is it the old timber sets job

Pique

Calahonda52 wrote: »

Yes re balls
Is it normal pb or is it the old timber sets job

pretty sure it's plasterboard but the house is 100 years old so I'm not sure what they had back then. What's timber sets?

Also, if this cannot be done because of what you mentioned, how can I insulate that part of the ceiling? There has to be a solution that doesn't involve removing the damn roof, right? Right???

Calahonda52

Sorry timber slats.
So there is no barrier either under the slates?

The best way to do this is to strip about a meter of slates from the bottom up and do the insulation from above, complete with ventilation baffles and ventilated eaves?
Have you power cables/pipes/ water tank up there.
https://www.nsai.ie/about/news/publication-of-sr-542014-code-of-practice

Pique

It's the usual roof AFAIK. Slates over felt and yes there is the usual water tank and overflow up there.

There isn't enough space between the ceiling and roof in the sloped sections to add insulation and still maintain sufficient ventilation however. OK there 'may' be room for 20mm insulation, maybe. Hence why I was looking at the internal insulation as a solution.

Thanks for the link too. I'll have a read later when I have time.