SBMS Posted Monday at 12:37 Share Posted Monday at 12:37 Currently assessing a blown cellulose product for our attic rooms and roof.. Anybody got any recommendation on suppliers/installers? So far have found Warmcel (awaiting call back) and Thermofloc (made by Thermafleece). Thermofloc tell me they're no longer doing blown cellulose installation. At the moment am considering switching to another blown product for the roof (such as blown mineral wool) purely because of the lack of installers (we're not DIYing it). It does make me wonder how common a product it is, outside of this forum (and the use of MBC, which is across this forum and where they use cellulose extensively, but presumably install it using their own teams?) Anybody got any recommended installers? UK, north west. Link to comment Share on other sites More sharing options...
Kelvin Posted Monday at 12:39 Share Posted Monday at 12:39 I had exactly the same problem in Scotland (Perthshire) Link to comment Share on other sites More sharing options...
SBMS Posted Monday at 13:25 Author Share Posted Monday at 13:25 45 minutes ago, Kelvin said: I had exactly the same problem in Scotland (Perthshire) @Kelvin Did you ditch the idea of cellulose? What did you go for? Link to comment Share on other sites More sharing options...
LiamJones Posted Monday at 13:29 Share Posted Monday at 13:29 I’ve got a quote from warmcel in Norwich. £19.25/m2 for 200mm Link to comment Share on other sites More sharing options...
SBMS Posted Monday at 13:31 Author Share Posted Monday at 13:31 (edited) 3 minutes ago, LiamJones said: I’ve got a quote from warmcel in Norwich. £19.25/m2 for 200mm Thanks Liam. When was that? Did they give any additional costs for 300mm or higher? Edited Monday at 13:34 by SBMS Link to comment Share on other sites More sharing options...
Kelvin Posted Monday at 13:34 Share Posted Monday at 13:34 6 minutes ago, SBMS said: @Kelvin Did you ditch the idea of cellulose? What did you go for? I did. 280mm Knauf Frametherm 32 Link to comment Share on other sites More sharing options...
SBMS Posted Monday at 13:36 Author Share Posted Monday at 13:36 1 minute ago, Kelvin said: I did. 280mm Knauf Frametherm 32 Was that a full fill? What U Value did you achieve with that? Link to comment Share on other sites More sharing options...
Duncan62 Posted Monday at 14:35 Share Posted Monday at 14:35 We're going to use blown wood fibre. List of all the insulation distributers below. Some of whom install too. STEICO_uk_distributor_map_construction_insulation_en_i(1).pdf Link to comment Share on other sites More sharing options...
LiamJones Posted Monday at 14:44 Share Posted Monday at 14:44 1 hour ago, SBMS said: Thanks Liam. When was that? Did they give any additional costs for 300mm or higher? March this year. No idea about 300mm Link to comment Share on other sites More sharing options...
IanR Posted Monday at 14:57 Share Posted Monday at 14:57 1 hour ago, SBMS said: Did they give any additional costs for 300mm or higher? Price would go up roughly pro-rata with increase in cavity thickness, if that's what you mean. They fill to a density, something between 55 - 60 kg/m³ iirc, so the thicker the wall the more bales of cellulose they require. I used Payne Insulation from Norwich - they did a really good job. Link to comment Share on other sites More sharing options...
SBMS Posted Monday at 15:02 Author Share Posted Monday at 15:02 16 minutes ago, Duncan62 said: We're going to use blown wood fibre. List of all the insulation distributers below. Some of whom install too. STEICO_uk_distributor_map_construction_insulation_en_i(1).pdf 429.13 kB · 2 downloads Thanks @Duncan62. Any reason you went wood fibre over cellulose? Link to comment Share on other sites More sharing options...
SBMS Posted Monday at 15:04 Author Share Posted Monday at 15:04 5 minutes ago, IanR said: Price would go up roughly pro-rata with increase in cavity thickness, if that's what you mean. They fill to a density, something between 55 - 60 kg/m³ iirc, so the thicker the wall the more bales of cellulose they require. I used Payne Insulation from Norwich - they did a really good job. Would you recommend cellulose again? How deep did you go? Link to comment Share on other sites More sharing options...
Kelvin Posted Monday at 15:15 Share Posted Monday at 15:15 1 hour ago, SBMS said: Was that a full fill? What U Value did you achieve with that? Yes full fill. With the full build up it was 0.11 as I recall (calculated using Changeplan) Link to comment Share on other sites More sharing options...
IanR Posted Monday at 15:22 Share Posted Monday at 15:22 3 minutes ago, SBMS said: Would you recommend cellulose again? How deep did you go? I've got 300mm walls and 350mm roof, filling an I-Joist Structure. Yes, would definitely do the same again. Thermal performance and acoustic performance exceeded expectation and are a large part of the resultant perceived high comfort levels. I was a little concerned about cutting Ø100 holes in the plasterboard at the top of every void, thinking the re-work of these may pop the plaster after a few years, but not one is noticeable after 7 years. Just remember to keep the discs you cut out. 1 Link to comment Share on other sites More sharing options...
SBMS Posted Monday at 15:35 Author Share Posted Monday at 15:35 12 minutes ago, IanR said: I've got 300mm walls and 350mm roof, filling an I-Joist Structure. Yes, would definitely do the same again. Thermal performance and acoustic performance exceeded expectation and are a large part of the resultant perceived high comfort levels. I was a little concerned about cutting Ø100 holes in the plasterboard at the top of every void, thinking the re-work of these may pop the plaster after a few years, but not one is noticeable after 7 years. Just remember to keep the discs you cut out. If you did it again would you try and get them to fill before plasterboard has been fitted? Link to comment Share on other sites More sharing options...
IanR Posted Monday at 16:00 Share Posted Monday at 16:00 17 minutes ago, SBMS said: If you did it again would you try and get them to fill before plasterboard has been fitted? Ah, yes, depends on build up. Not an option for my "Value Engineered" structure, that doesn't include a service void across 95% of the external walls and roof. PB closes off the structure, so needs to be in place for the insulation fill. If you're including an OSB inner layer (+ battens) + PB, then yes, holes in the OSB only and can probably close of with stapled net, before boarding. Link to comment Share on other sites More sharing options...
SBMS Posted Monday at 16:48 Author Share Posted Monday at 16:48 46 minutes ago, IanR said: Ah, yes, depends on build up. Not an option for my "Value Engineered" structure, that doesn't include a service void across 95% of the external walls and roof. PB closes off the structure, so needs to be in place for the insulation fill. If you're including an OSB inner layer (+ battens) + PB, then yes, holes in the OSB only and can probably close of with stapled net, before boarding. Interesting... guy from warmcel told me we needed a very vapour impermeable layer for the inner roof makeup (Propassiv best - OSB cheapest) but said we couldn't use Plaster board (and that the pressure from the Cellulose blower could blow it off). Is that rubbish? Link to comment Share on other sites More sharing options...
MikeSharp01 Posted Monday at 16:48 Share Posted Monday at 16:48 We got lucky with our blown cellulose - we DIYed it by 'borrowing' a machine from a member here who purchased a machine on Ebay. This machine is no longer available but they do come up on ebay or there are smaller machines available in the states that would do the job. DIY was not that difficult but made some rookie errors particularly around the stretching of the internal Intello membrane. UK kits are available for purchase / rent EG https://www.markham-sheffield.co.uk/product/turbisol-56-blowing-machine/ Link to comment Share on other sites More sharing options...
IanR Posted Monday at 17:00 Share Posted Monday at 17:00 5 minutes ago, SBMS said: Interesting... guy from warmcel told me we needed a very vapour impermeable layer for the inner roof makeup (Propassiv best - OSB cheapest) but said we couldn't use Plaster board (and that the pressure from the Cellulose blower could blow it off). Is that rubbish? Not complete rubbish. I used foil-back PB, which is vapour impermeable, although you end up with some gaps in it for sockets, switches etc. and fixings for PB on the externals walls and roof were specified as 150mm spacing. Payne Insulation were happy with that and there's no noticeable bowing of PB panels or of fixings popping. My (I-Joist) studs were at 400 centres - 600 centres would probably leave the PB insufficiently supported. 1 Link to comment Share on other sites More sharing options...
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