Floor insulation Options/Advice

rcklap

Hi,

I live in a 1950s Bungalow with no insulation whatsoever, it's freezing we are planning a complete overhaul, replumb/rewire/windows etc...

My question relates to insulation. The plan at the moment is to:

1. Insulate the internal walls with 65MM board
2. Insulate the ceilings with 50MM board (it's a bungalow)
3. Insulate the floors.... the floors are suspended floors, the house is built up quite high off the ground and floors are generally VERY cold.
4. Attic insulation TBC, we may be converting it.
5. Replace Windows with high performance aluclad windows/slider and composite front door.

Any advice on Floor Insulation options and if our above plan is a good one?

Thanks!

jimbo1979

rcklap wrote: »

Hi,

I live in a 1950s Bungalow with no insulation whatsoever, it's freezing we are planning a complete overhaul, replumb/rewire/windows etc...

My question relates to insulation. The plan at the moment is to:

1. Insulate the internal walls with 65MM board
2. Insulate the ceilings with 50MM board (it's a bungalow)
3. Insulate the floors.... the floors are suspended floors, the house is built up quite high off the ground and floors are generally VERY cold.
4. Attic insulation TBC, we may be converting it.
5. Replace Windows with high performance aluclad windows/slider and composite front door.

Any advice on Floor Insulation options and if our above plan is a good one?

Thanks!

Kingspan insulation board is your only man packed between the joists

listermint

Surely external insulation would be a better option , i.e wrapping the house in a warm blanket from the outside.

This would result in maintaining the internal room size, and if you bring it to past the facia (top of block) and below Plinth path level , It would wrap the floor area and the wall area simultaneously. Plus bringing to block top means it meets the attic insulation too, removing thermal gaps.

BryanF

jimbo1979 wrote: »

Kingspan insulation board is your only man packed between the joists

Really? Why do you think that?

Difficult to fit without gaps
Not breathable

jimbo1979

BryanF wrote: »

Really? Why do you think that?

Difficult to fit without gaps
Not breathable

Did you read point 3.its suspended flooring.get with the programme skin

rcklap

I'd like to add that I had two people belonging to the builder arguing over a cage and rockwool solution vs. the boards.

Sorry for the bad explanation/terminology

BryanF

jimbo1979 wrote: »

Did you read point 3.its suspended flooring.get with the programme skin

I certainly did. Still wouldn’t recommend,specify, detail, install or certify Kingspan between joists.

You haven’t answered my question?

rcklap

Anybody have anything to add?
Thanks.

Lumen

rcklap wrote: »

Anybody have anything to add?
Thanks.

Well FWIW, this is what my surveyor (engineer) wrote on this subject in his report, my emphasis.

Upgrading of Floor Insulation at lower ground floor level. This will entail the removal of the existing suspended timber floors and possibly concrete floor to the utility and kitchen and replacement with ground bearing slab on 120 thick k3 kingspan insulation on dpm on 50 sand. The employment of 120mm kingspan insulation will achieve a significant thermal upgrade to U-value= 0.16W/m2K or less.Estimated Cost including floor finishes: €15,000 ex vat.

BryanF

rcklap wrote: »

Hi,

I live in a 1950s Bungalow with no insulation whatsoever, it's freezing we are planning a complete overhaul, replumb/rewire/windows etc...

My question relates to insulation. The plan at the moment is to:

1. Insulate the internal walls with 65MM board
2. Insulate the ceilings with 50MM board (it's a bungalow)
3. Insulate the floors.... the floors are suspended floors, the house is built up quite high off the ground and floors are generally VERY cold.
4. Attic insulation TBC, we may be converting it.
5. Replace Windows with high performance aluclad windows/slider and composite front door.

Any advice on Floor Insulation options and if our above plan is a good one?

Thanks!

1. What is the wall build up currently
2. How ‘long’(edit) will you be before retro fitting up stairs
3. Floors : you got to weigh up disruption , cost and time. I did suspended floor insulation, breathable felt under, mineral wool between, intello taped and sealed above
4. As per 2
5. They become all about the detailing of the above