Insulation over floor before flooring

[houstonwehaveaproblem]

Part converted garage with suspended floor. No insulation underneath and quite a ball ache to get under.

Has anyone fitted the ecotec type foil insulation you can fit over the floor before flooring goes down.

Is this likely to be acceptable for building control?

 

[endecotp]

That’s unlikely to work, sorry.

 

[houstonwehaveaproblem]

That’s unlikely to work, sorry.

How come?

This is the stuff

https://www.ecohome-insulation.com/

 

[endecotp]

Foil insulation is a controversial material. Proponents claim miraculous properties that probably aren’t achieved by most users in practice.

Specifically the story that I recall is that when these materials have been tested in roofs, much of the supposed benefit actually comes from them sealing drafts so warm air no longer escapes.

Another issue is that its reflective effect only works if there is a large air space either side.

 

[houstonwehaveaproblem]

Foil insulation is a controversial material. Proponents claim miraculous properties that probably aren’t achieved by most users in practice.

Specifically the story that I recall is that when these materials have been tested in roofs, much of the supposed benefit actually comes from them sealing drafts so warm air no longer escapes.

Another issue is that its reflective effect only works if there is a large air space either side.

its a foam type with foil. Just reading on the website that it does meet building control apparently.

 

[endecotp]

https://www.ecohome-insulation.com/...2/EcoTec-Floorfoam-Data-and-Fitting-Sheet.pdf

Their claim is that this 4mm sandwich of foil and foam is equivalent to 35mm of polystyrene.
I’d say you might get that effectiveness if you put it in front of a gas fire, because the foil surface can literally reflect the infra red. But as a laminate or carpet underlay, with no air gap at all, the claim is borderline scam.

Do they have a specific claim about compliance in this flooring application? I don’t see one in that datasheet.

 

[houstonwehaveaproblem]

https://www.ecohome-insulation.com/...2/EcoTec-Floorfoam-Data-and-Fitting-Sheet.pdf

Their claim is that this 4mm sandwich of foil and foam is equivalent to 35mm of polystyrene.
I’d say you might get that effectiveness if you put it in front of a gas fire, because the foil surface can literally reflect the infra red. But as a laminate or carpet underlay, with no air gap at all, the claim is borderline scam.

Do they have a specific claim about compliance in this flooring application? I don’t see one in that datasheet.

Ah not sure.

other than insulating underneath the floor, any other suggestions?