AS per the title. Reason for the question is I plan to refurb my kitchen with bathroom above so no requirement for insulation but as the ceiling is down I am going to anyway but just with 50mm, for cost efficiency i plan on getting 100mm thick slabs and cutting them down to 50mm thickness so which is going to be easier more stable stiffer Knauf dritherm32 or ROCKWOOL Thermal Insulation Cavity Batt 37 or somthing else
Which is stiffer Rockwool or dritherm
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You can get the soundproofing grade in 50mm. As it is thinner, you get about twice the area in a pack as for cavity batts, at about the same price.
www.wickes.co.uk
Rockwool Sound Insulation Slab - 50 x 400 x 1200mm | Wickes.co.uk
Rockwool Sound Insulation Slab - 50 x 400 x 1200mm
www.wickes.co.uk
Oh yes thanks I didn't realise that the 100mm dritherm is 6 to a pack cut half is 12 same as the rockwool and no messing and causing a mess also funny you should link Wickes as that is where I am getting it from.You can get the soundproofing grade in 50mm. As it is thinner, you get about twice the area in a pack as for cavity batts, at about the same price.
Rockwool Sound Insulation Slab - 50 x 400 x 1200mm | Wickes.co.uk
Rockwool Sound Insulation Slab - 50 x 400 x 1200mm
The only difference is that Dritherm is 0.32 and rock wool is 0.38 and also rockwool is 400mm wide but so is my gaps between joists within +- 15mm. Dritherm £51 Rockwool £53
Apart from the slightly too short width joist space do you think it will stay up on its own 60s house rough sawn joists. Or will I need to pop some screws ( or something else ) in to support it until it gets boarded.
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It's a fire reg thing tbh. My entire house has metal net holding insulation.
Go with the string
Where upgrading a floor for fire resistance is required, the insulation needs to stay in place if the supporting plasterboard ceiling comes down.
Wayners was referring to string to hold the insulation up whilst you board it. Plastic mesh is better for this purpose.
Good luck with trying to trim 100mm slabs to 50mm.
To be honest 50mm is not worth the hassle involved.No, but a load of insulation falling onto firemen might.
Ah I see that makes sense.
I have done it before but cant remember what product it was and it was fairly successful but wasnt trying to get it to support itself as it was in aloft which is why I was asking if anyone has had experience with a product.Where upgrading a floor for fire resistance is required, the insulation needs to stay in place if the supporting plasterboard ceiling comes down.
Wayners was referring to string to hold the insulation up whilst you board it. Plastic mesh is better for this purpose.
Good luck with trying to trim 100mm slabs to 50mm.
50mm has to be better than nothing does it not and as the ceiling is already down I am not taking the ceiling down just to fit 50mm
The insulation is fire proof so is the idea behind it to not impede the fireman's progress through the house.
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NoSo a bit of string is going to burn the house down, they will outlaw plastic wallplugs next
Not aimed at you by the way
After the fire brings down plasterboard, the wire holds the rockwool in place stopping fire going up.
I kid you not. I just fitted it. Did help with holding the insulation in place
Ahh that makes total sense now.
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