Foam glass insulation

[mjc55]

Anyone used this of late.

 

It looks good in terms of replacing other types of less environmentally friendly insulation but haven't got far enough to look at costs. 

 

There was an old thread from around 2019 saying that it needs to be much, much thicker (their emphasis), does this mean that it is much more expensive in the long run?  That was pre-pandemic and presumably petrochemical type insulations have increased in price a lot since then.

 

Thanks

[Roger440]

4 hours ago, mjc55 said:

Anyone used this of late.

 

It looks good in terms of replacing other types of less environmentally friendly insulation but haven't got far enough to look at costs. 

 

There was an old thread from around 2019 saying that it needs to be much, much thicker (their emphasis), does this mean that it is much more expensive in the long run?  That was pre-pandemic and presumably petrochemical type insulations have increased in price a lot since then.

 

Thanks

 

Ive used it, though the main drivers were damp issues in 1800's house, and minimising build up depth.

 

Clearly with the amount i used, we were not achieving building reg level insulation. 

 

But, easy, definitely. Id consider it again, be it retrofit or new build.

[mjc55]

2 hours ago, Roger440 said:

 

Ive used it, though the main drivers were damp issues in 1800's house, and minimising build up depth.

 

Clearly with the amount i used, we were not achieving building reg level insulation. 

 

But, easy, definitely. Id consider it again, be it retrofit or new build.

 

Presumably cost wasn't an issue then?

[Roger440]

7 hours ago, mjc55 said:

 

Presumably cost wasn't an issue then?

 

I dont remember it being particuarly high. As i had no other options i didnt focus on it that much. And it was only onew (big) room

[Alan Ambrose]

>>> it needs to be much, much thicker

 

This is my material crib-sheet. It suggests, that for the same U-Value, Foamglas needs to be twice as thick as, say, PIR.