Knauf 100mm space loft roll £13 at  Wickes -  FREE Click & Collect
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Knauf 100mm space loft roll £13 at Wickes - FREE Click & Collect

£13£21.7440%Wickes Deals
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Found 1st MarEdited by:"PuggyPLee"
Lowest ever price from what I can see, cheaper than B&Q
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What a price !! Trade get further 10% off with there Trade pro App....
Exactly what I was after to finish a small area in the loft - thanks for posting.
Shame it's not the 17cm stuff that I'm using although I did see (that's £22'ish), but did see they are doing 3 for 2 on that and I think also the 20cm stuff as well.
Dragon328 m ago

Shame it's not the 17cm stuff that I'm using although I did see (that's …Shame it's not the 17cm stuff that I'm using although I did see (that's £22'ish), but did see they are doing 3 for 2 on that and I think also the 20cm stuff as well.


Some very hasty maths suggests the 3-for-2 on 200mm is actually cheaper than the 100mm.

Note that if you're doing "proper" loft insulation, 100mm hasn't been recommended since 1985, current recommendation is 270mm and it goes up all the time. If you're just taking the chill out of your garage a bit or something, doesn't matter so much.
Edited by: "EndemicAlarm" 1st Mar
EndemicAlarm15 m ago

Some very hasty maths suggests the 3-for-2 on 200mm is actually cheaper …Some very hasty maths suggests the 3-for-2 on 200mm is actually cheaper than the 100mm.Note that if you're doing "proper" loft insulation, 100mm hasn't been recommended since 1985, current recommendation is 270mm and it goes up all the time. If you're just taking the chill out of your garage a bit or something, doesn't matter so much.


I thought the recommendation was to fill between the roof timers (often 100mm) and then have a second layer at 90 degrees to prevent thermal bridging via the joists. To do this you need both 100mm and 200mm thicknesses.
Dragon3230 m ago

Shame it's not the 17cm stuff that I'm using although I did see (that's …Shame it's not the 17cm stuff that I'm using although I did see (that's £22'ish), but did see they are doing 3 for 2 on that and I think also the 20cm stuff as well.


Yeah both the 170 & 200 on 3 for 2 @ £14.49

correct old 100mm used was poor quality, for best results 100mm between rafters the 200mm over the top at 90 degree to bottom layer, (170mm second layer min)
Edited by: "colin.morton" 1st Mar
A timely offer. Thanks.
Awesome, ordered 9 rolls been wanting to get some down in our loft for ages!
EndemicAlarm3 h, 38 m ago

Some very hasty maths suggests the 3-for-2 on 200mm is actually cheaper …Some very hasty maths suggests the 3-for-2 on 200mm is actually cheaper than the 100mm.Note that if you're doing "proper" loft insulation, 100mm hasn't been recommended since 1985, current recommendation is 270mm and it goes up all the time. If you're just taking the chill out of your garage a bit or something, doesn't matter so much.


This is the bottom layer that goes between the rafters - you then stick the 170mm stuff on top!
Not my loft (or wife) but this how its done.... as many have said 100mm between joists then 170 or 200 on top at 90degree to first layer, if you don't do it like this then you will get "cold bridging" via the joists,

Note: if you were only to put 200mm between joists there would be very little benefit....

colin.morton1 h, 8 m ago

Not my loft (or wife) but this how its done.... as many have said 100mm …Not my loft (or wife) but this how its done.... as many have said 100mm between joists then 170 or 200 on top at 90degree to first layer, if you don't do it like this then you will get "cold bridging" via the joists, Note: if you were only to put 200mm between joists there would be very little benefit....[Image]


Thanks for that - I started doing it the other way, bit luckily have only got 1 roll down so far so will either change it or just do the rest at 90 degrees.

Mine is taking a little longer as using loft legs and putting boarding over the top and also the distance between the rafters seems to be less than the boards (guess it's because it's a 1950's house)?
Dragon328 m ago

Thanks for that - I started doing it the other way, bit luckily have only …Thanks for that - I started doing it the other way, bit luckily have only got 1 roll down so far so will either change it or just do the rest at 90 degrees.Mine is taking a little longer as using loft legs and putting boarding over the top and also the distance between the rafters seems to be less than the boards (guess it's because it's a 1950's house)?


No problem, Loft legs are grate, be careful with the distance / spacing there is a table on there web site that can help, I renovate houses the older one are fantastic but nothing "just works" every project need more thought and extra effort. but after its all done you will glad you did it.....
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