Insulating under suspended wooden floor

[grimly4]

Exactly so; but why put the plastic down first, when all the crawling over it will likely bugger it?

[fred]

In article , george [dicegeorge] writes

Building regs here (Scotland) require the underfloor surface to be sealed, tar in older times and weak mix mortar more recently. I'd expect something similar doon sooth too.

[The Natural Philosopher]

that's for a none suspended floor.

Now it happens that I have a block and beam suspended concrete floor here, and yes, over the block and beam is a tough sheet of polythene, and then some insulation, and then some screed.

But there is no requirement to actually stop the moisture at earth level.

That's what the ventilation is all about.

[fred]

No, this is on suspended floors.

It's been done on every underfloor I have come across up here. With the effort and expense involved, I doubt they'd do it without it being a requirement. Remember things are different up here eg. all roofs have boarded sarking.

[grimly4]

Yes - every house I've seen under the floor of in Scotland had that. I don't know when it was introduced, but certainly my '30s bungalow had tar laid down on the ground underneath.

My experience too.