Ceiling Insulation.. Thermal.. Acoustic?

LMK

What type of insulation is recommended to be used in the ground floor ceiling of a 2 story dwelling?
Thanks

DublinDilbert

Normally wouldn’t put insulation on the ground floor unless there’s an issue your trying to solve. You can double slab it, 9mm plaster board is cheap and once skimmed you’ll have a new ceiling, it will definitely block out noise and keep heat in.

Dakotabigone

DublinDilbert wrote: »

Normally wouldn’t put insulation on the ground floor unless there’s an issue your trying to solve. You can double slab it, 9mm plaster board is cheap and once skimmed you’ll have a new ceiling, it will definitely block out noise and keep heat in.

Some clothes design from the 1970s come back into fashion but let’s park the 9mm plasterboard.

Kevin Finnerty

Dakotabigone wrote: »

Some clothes design from the 1970s come back into fashion but let’s park the 9mm plasterboard.

I wouldn't be using 9mm in a ceiling. Nor would I insulate an intermediate floor in a two storey.

LMK

I had the kitchen renovated last year and ceiling had to be redone.. so the builder put in rockwool type insulation... upstairs room is now soundproof from kitchen noise.. I'm going to renovate a living room and intend on doing similar but someone suggested using the Kingspan solid style... I hadn't thought of just fixing new sheets over existing stipple ceiling.. would this work? anyone done it themselves?

DublinDilbert

LMK wrote: »

I had the kitchen renovated last year and ceiling had to be redone.. so the builder put in rockwool type insulation... upstairs room is now soundproof from kitchen noise.. I'm going to renovate a living room and intend on doing similar but someone suggested using the Kingspan solid style... I hadn't thought of just fixing new sheets over existing stipple ceiling.. would this work? anyone done it themselves?

Yes double/over boarding the ceiling does work, just don't use foil backed slabs. It works well, plasters like skimming a new board. Definitely helps sounds and keep the heat down stairs.

Calahonda52

Kevin Finnerty wrote: »

1: I wouldn't be using 9mm in a ceiling.
2: Nor would I insulate an intermediate floor in a two storey.

1: Double slabbed with staggered joints gives a better sound proofing than a single 12.5mm.
2: why not?

Kevin Finnerty

Calahonda52 wrote: »

1: Double slabbed with staggered joints gives a better sound proofing than a single 12.5mm.
2: why not?

1. I meant as a single slab.( I see now above poster mentioned double slabbing, then no bother)
2. The same heat can heat 2 zones. Once the attic insulation does its job I'd consider insulating a joisted upstairs floor overkill.

listermint

You wouldn't do this unless it's a separate dwelling. By all means insulate the top floor to attic area but from ground to first is a pointless excercise.

Noise? What sort of noise is your own family making . This sounds like pissing money away

GreeBo

Batt insulation would help with sound pollution, but most noise in houses is bass noise and that travels very well and insulation wont do anything to stop it unless you get into airgaps between surfaces which is silly money for a domestic situation.

Kingspan solid insulation isnt going to do anything for any type of noise.

Calahonda52

The current thinking in residential energy conservation is that each room is treated as a stand alone item to be insulated, so doing the first floor/ceiling void is now considered good practice.

GreeBo

Calahonda52 wrote: »

The current thinking in residential energy conservation is that each room is treated as a stand alone item to be insulated, so doing the first floor/ceiling void is now considered good practice.

You'd want to ensure every heat source had its own stat if doing a retro so TRV on every rad or a nest in every room. Bit that's good practice anyway.

Though does it not massively depend on building construction?

Seems like it would make more sense to not isolate rooms if your house is designed with a large thermal mass? But if you were more concerned with cooling than heating isolated rooms would make sense probably.

listermint

Calahonda52 wrote: »

The current thinking in residential energy conservation is that each room is treated as a stand alone item to be insulated, so doing the first floor/ceiling void is now considered good practice.

It would be as part of an overall plan. But stand alone it's pointless.

Good practice has to be shown in context not isolation

Lumen

It makes sense to prepare family homes for partial occupation in future when kids have left. If they ever leave...

I also think in an old house every little bit counts. E.g. using higher density insulation between joists helps with acoustics and reduces unwanted air movement, but probably isn't worth doing until floors or ceilings need replacement for other reasons. A bit like the SEAI recommending window upgrade as part of the normal replacement cycle.

Calahonda52

listermint wrote: »

It would be as part of an overall plan. But stand alone it's pointless.

Good practice has to be shown in context not isolation

Good practice is good practice and is never stand alone or in isolation .

LMK

Update - Finished this 2 weeks ago -
I took down the old plasterboard.
Insulated the ceiling with ROCKWOOL FLEXI SLAB 1200X400X50MM (PACK SIZE 5.76M2) then 12.5mm plasterboard..

Its irritating on the eyes when putting up the insulation ... I used safety glasses other than that not a big job..
14.5' x 14.5' ceiling cost of materials €270 - getting it slabbed and plastered €250... Getting rid of the old plasterboard €20..

This definitely does improve the heat retention in the room, I'm happy with the outcome..