“Bagged” loft insulation

[Tim+]

By “bagged” I mean the insulation is enclosed when unrolled.

I’m finally getting around to topping up our loft insulation but because
our boiler is at the far end of the loft, I need to maintain access to it.

There’s not enough headroom to use legs to raise the bit of flooring that
presently provides access so I was wondering if there’s a form of
insulation available now the I could just roll up easily when I want access
and then replace afterwards.

Wicked used to do Knauf Space Blanket but not any more it seems.

https://www.staall.com/uk/product/info/229639/knauf-space-blanket-encapsulation-loft-roll-insulation--200mm-x-370mm-x-4m

Anyone know of a similar product?

Tim


--
Please don't feed the trolls

[Theo]

Tim+ <tim.d...@gmail.com> wrote:
> Anyone know of a similar product?

https://insulationandlagging.co.uk/Loft-Wall-Floor-Insulation/Super-Loft-Blanket-Insulation-Space-Saving-Itch-Free-Loft-Roll

works out about 3x as expensive as regular insulation though.

An alternative plan is to wrap insulation in similar film. Somebody
mentioned there are condensation issues (use breathable film?) so would need
thinking about the temperature gradient.

(I found a really good calculator of insulation performance here:
https://www.ubakus.com/en/r-value-calculator/
- tells you things like U value, decrement delay, condensation, etc, for
any arbitrary insulation stackup)

Theo

[Andy Burns]

Tim+ wrote:

> Wicked used to do Knauf Space Blanket but not any more it seems.
>
> https://www.staall.com/uk/product/info/229639/knauf-space-blanket-encapsulation-loft-roll-insulation--200mm-x-370mm-x-4m
>
> Anyone know of a similar product?

I used Space Blanket as a top-up layer when the energy co's were practically
giving it away, B&Q may have cleared all theirs out too

<https://diy.com/knauf-space-blanket/182138_BQ.prd>

[www.GymRats.uk]

On 21/03/2022 16:52, Tim+ wrote:
>
> By “bagged” I mean the insulation is enclosed when unrolled.
>
> I’m finally getting around to topping up our loft insulation but because
> our boiler is at the far end of the loft, I need to maintain access to it.

A word of caution from personal experience.
After fully insulating our loft with the 270(?)mm Rockwool of the day I
inadvertently left the outer wrapping of the last roll just laying on
top the the insulation. Shouldn't have caused a problem to my mind
but... skip forward a number of years (perhaps 8 or so) and I noticed a
patch of ceiling in the kitchen was damp (upsidedown house).

Went into the loft and the small section of plastic wrapping had been
acting as a cold surface for vapour to condense on and drip back down
through the loft insulation to the ceiling causing a soft patch of
plasterboard that had to be cut out and patched up.

Just something to watch out for.

Cheers - Pete

[David]

Could you use off cuts of Kingspan or similar?

As long as there is room to move the blocks to one side.

Cheers


Dave R



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[Tim+]

www.GymRats.uk <0845.86...@GymRatZ.Gym.Equipment> wrote:
> On 21/03/2022 16:52, Tim+ wrote:
>>
>> By “bagged” I mean the insulation is enclosed when unrolled.
>>
>> I’m finally getting around to topping up our loft insulation but because
>> our boiler is at the far end of the loft, I need to maintain access to it.
>
> A word of caution from personal experience.
> After fully insulating our loft with the 270(?)mm Rockwool of the day I
> inadvertently left the outer wrapping of the last roll just laying on
> top the the insulation. Shouldn't have caused a problem to my mind
> but... skip forward a number of years (perhaps 8 or so) and I noticed a
> patch of ceiling in the kitchen was damp (upsidedown house).

Thanks for the warning. As I happens I’ve used a large sheet of polythene
to drag it into an awkward spot and I’ve forgotten to remove it afterwards.
Will do so now!

[Tim+]

All gone alas. Think I well and truly missed that boat!

[Tim+]

Theo <theom...@chiark.greenend.org.uk> wrote:
> Tim+ <tim.d...@gmail.com> wrote:
>> Anyone know of a similar product?
>
> https://insulationandlagging.co.uk/Loft-Wall-Floor-Insulation/Super-Loft-Blanket-Insulation-Space-Saving-Itch-Free-Loft-Roll
>
> works out about 3x as expensive as regular insulation though.

Thanks. I found that company before but couldn’t find an “order here” link.

>
> An alternative plan is to wrap insulation in similar film. Somebody
> mentioned there are condensation issues (use breathable film?) so would need
> thinking about the temperature gradient.

Hmmm, maybe if I could find some of that paper fabric used for “decorating
suits” on a roll I could just staple it around an unrolled strip?

[Tim+]

David <wib...@btinternet.com> wrote:
> On Mon, 21 Mar 2022 16:52:46 +0000, Tim+ wrote:
>
>> By “bagged” I mean the insulation is enclosed when unrolled.
>>
>> I’m finally getting around to topping up our loft insulation but because
>> our boiler is at the far end of the loft, I need to maintain access to
>> it.
>>
>> There’s not enough headroom to use legs to raise the bit of flooring
>> that presently provides access so I was wondering if there’s a form of
>> insulation available now the I could just roll up easily when I want
>> access and then replace afterwards.
>>
>> Wicked used to do Knauf Space Blanket but not any more it seems.
>>
>> https://www.staall.com/uk/product/info/229639/knauf-space-blanket-
> encapsulation-loft-roll-insulation--200mm-x-370mm-x-4m
>>
>> Anyone know of a similar product?
>>
>> Tim
>
> Could you use off cuts of Kingspan or similar?

I suppose but a “sausage” that I could just roll up would be easier than
multiple pieces of Kingspan.

[Robin]

I have some of the Space Blankets in the loft and the perforations in
the foil are petty small. So I'd guess (NB "guess" as in "don't blame me
if I'm wrong") you'd get at least as much benefit from sandwiching
insulation between 2 lengths of breathable membrane. If you don't need
much perhaps wave a tenner in front of a roofer?


--
Robin
reply-to address is (intended to be) valid

[newshound]

On 21/03/2022 18:32, Tim+ wrote:

How about decorators' dust sheet fabric? Cheap, tough, breathable but
should retain any loose fibres quite well.

[Tim+]

That might work. Also thinking about frost protection fleece for plants.
That’s pretty cheap and come on long rolls.

[Andrew]

On 21/03/2022 18:32, Tim+ wrote:

If you had a 'pathway' to the boiler where the insulation was only
toghtly fitting 'celotex' then this is the equivalent of twice the
depth of rockwool