Page 1 of Loft insulation...a query

Unusual one, regarding effectiveness.

Assuming the rafters in your loft were (x) in height and the insulation was double that, if you floored the loft area and compressed the insulation (not remove or cut, just compress under the flooring) would it be more or less effective, or just the same?

My head thinks on one hand nothing is removed so it should stay the same, then on the other hand maybe the expanded insulation would trap more air etc.
it's those rolls of rockwool-itchy stuff thats been fitted but it's apparently very very high quality.

My head hurts thinking about it!

Jimbo : oÞ




"There`s that word again... is there a problem with the Earth`s gravitational pull in the future?"

Definitely less effective, but how much less I'm not sure how to calculate.

There is probably a formula somewhere, though whether you'd have all the figures to pump into it I don't know. :)


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Quote:
Rob Shepherd says...
"Definitely less effective, but how much less I'm not sure how to calculate."
Maybe so but then surely the added flooring should more than compensate.


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Way less effective, I would have thought, regardless of the fact that the flooring is there. It's the layers (or, rather, the spaces between the layers) that create the insulation. That's why insulation is how it is - soft and fluffy - rather than compact and hard.

This item was edited on Tuesday, 10th June 2014, 11:00

Less effective - it's the air that insulates.  Didn't stop me doing the same last year though. :)
Got it insulated for free and then boarded it.

Ste

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We will pay the price but we will not count the cost..

Yeah, thinking exactly the same Ste, need to board it. Haven't had the heating on since we moved in last week do really don't think we'll notice the drop in effectiveness but the space is required for the usual storage of stuff.
(And maybe my projector room or workshop area after the initial year is up :-D )

The space up there is massive and the way it's been built saves having to move anything to make the room.

Will post a pic once my broadband is installed cos for now ahm on me iphone :-/

Jimbo : oÞ

"There`s that word again... is there a problem with the Earth`s gravitational pull in the future?"

Building regulations for new builds is 170mm. You can floor it, but you'd have to build up and support the rafters first

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get that space blanket insulation that you can staple to the roofing trusses, or the latest thing seems to be the spray foam option... been used for years in very cold climates, beginning to be more popular over here, and used to prolong the life of roofs too!

Like I said Mark, dont think we'll notice the drop anyway.

Pete.... Can you expand on the build up/support thing? Any way I can tell if this isn't required etc as this place has a few new innovations in it apparently, all based around energy saving/eco stuff.

Jimbo : oÞ

"There`s that word again... is there a problem with the Earth`s gravitational pull in the future?"

That's for new build only jimbo.
I actually insulated the loft and then lay new joists across at 90 degrees and that's what was insulated for free. That was higher than the newer joists I put in so was compressed down when I fitted the boards. So it's not as though I compressed it all down to 5" or so. They did another smaller loft too and that's way more than 170mm. I'd never say one room felt any different though. Some rooms are naturally warmer/colder than others - you'd be hard pressed to say it was due to extra insulation in one or the other.
I must say though, new, new builds are very warm. I looked around one recently and there was easily 12" in the loft. I know because I could reach the loft hatch and opened it -loooooow ceilings. Wall insulation etc. obviously all makes quite a difference too.

Ste

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We will pay the price but we will not count the cost..