March 27, 20179 yr Author On 25/03/2017 at 09:53, Alexphd1 said: @readiescards i know you still have to plaster board etc but have you noticed a sound reduction from upstairs with the spray foam in the posi-joists? I can't directly answer that question as the whole spray foam was installed at the same time and sound proofness of the whole house improved substantially - reducing the sound of the wind and rain outside and softening the internal echos. Much better. Last bit of posijoist installation goes in mid-April and I'm hoping for a reduction of interfloor sound transmission but given there is not much noise around at the moment it will be hard to gauge the amount.
April 11, 20179 yr Author Got rid of my offcuts :-) Offered it for free on Facebook and guy came and the bags away to use for stuffing targets for shooting practice. Ideal use I reckon. Though going to be a big mess to tidy up I think.
August 1, 20179 yr @readiescards& @PeterStarck or anybody else who had had spray insulation. Do you know how much drums the guys went through for a rough m2 and and depth..... Trying a DIY effort...
August 1, 20179 yr 4 hours ago, Alexphd1 said: @readiescards& @PeterStarck or anybody else who had had spray insulation. Do you know how much drums the guys went through for a rough m2 and and depth..... Trying a DIY effort... I'm sorry I can't remember how many drums they used. I do know they under estimated and had to get another one.
August 1, 20179 yr Author 10 hours ago, Alexphd1 said: @readiescards& @PeterStarck or anybody else who had had spray insulation. Do you know how much drums the guys went through for a rough m2 and and depth..... Trying a DIY effort... Sorry no as depth varying and it was done in two sessions with some new and some old barrels
October 10, 20179 yr Author Found another place to 'lose' some of the foam off cuts - in the eaves of my office room. (Also have dumped a lot of PIR foam off cuts in there too)
October 10, 20179 yr Don't ever lose a hamster in the house mate, it'll be years before it resurfaces
January 17, 20233 yr Hi Guys, I'm in this exact position.....Can I ask are Mortgage providers ok with this, has anyone got any experience with it? also, any good recommended installers? Thanks
January 17, 20233 yr 5 hours ago, Renegade105 said: Hi Guys, I'm in this exact position.....Can I ask are Mortgage providers ok with this, has anyone got any experience with it? also, any good recommended installers? Thanks Sorry thIs thread has got a few twists and turns. Which position are you in? Spray foam between rafters is definitely problematic in some houses.
January 17, 20233 yr Hi, Roof Truss's aren't in yet but will be soon. Spray foam onto a tight vapour barrier would be the easiest option of speed and air tightness, but this whole time I thought it wasn't BBA approved! Turns out I was wrong. Cant see anything wrong with it...its fast, should get good airtightness, negatives are possible toxins (unlikely) and cold bridging via the actual trusses, and unclear what the heat decrement delay is. Apart from that, seems like a whole lot faster than cutting wood fibre boards etc.
January 22, 20233 yr Author 5 years on, my thoughts are that spray foam insulation is expensive and fairly ineffective as an insulation product (maybe a side effect of it's breathability) I would not encourage anyone to use it.
January 22, 20233 yr Wow really? What do you think is the reason? What U value did you build to and was it open or closed? What’s you’re roof build up like? cheers
January 22, 20233 yr On 17/01/2023 at 23:12, Renegade105 said: Spray foam onto a tight vapour barrier would be the easiest option of speed and air tightness, but this whole time I thought it wasn't BBA approved! Turns out I was wrong. There are different types of spray expanding foam. We used Icynene in our passivhaus which is open cell and with 350mm in the walls and roof we achieved an airtightness value of 0.47ACH without any tapes or membranes. The U value for the walls and roof was 0.095W/m2K and we heated the whole house to 23C with three electric towel rails and warm air from an EASHP in the MVHR system. The house was in East Kent. Edited January 22, 20233 yr by Gone West
January 26, 20233 yr hi @Gone West, That's very impressive. What's it like being in the attic space then, I assume its habitable...Does it overheat a lot or is it better than the usual PIR stuff. I like the sound of the Wood Fibre Insulation but trying to get that lot air-tight would be near enough impossible with my roof.
January 26, 20233 yr Hi @Iceverge, Its for a pitched roof. Building regs say we need to get to a max U-value of 0.16, so that's what I'm aiming for and not the 0.11.
January 26, 20233 yr On 22/01/2023 at 08:42, readiescards said: 5 years on, my thoughts are that spray foam insulation is expensive and fairly ineffective as an insulation product (maybe a side effect of it's breathability) I would not encourage anyone to use it. We have a roof over 240m2 all vaulted and have 350mm of icycrene spray foam, behind an airtight vapour control layer. Heat loss is pretty much as predicted. Agree it is expensive, but compared to spending weeks doing insulation and ripping my hands apart stuffing between the metal webs of posi rafters - a bargain, job done in two days.
January 27, 20233 yr 10 hours ago, Renegade105 said: What's it like being in the attic space then, I assume its habitable...Does it overheat a lot or is it better than the usual PIR stuff. We only had one area that was an attic, the rest had vaulted ceilings. It didn't overheat a lot but we had reflective film on the windows. Decrement delay wasn't a factor in our area as we were only a couple of miles from the coast and we had sea breezes everyday. We had the Icynene installed in 2015, and we moved in, in 2018. We lived there for over three years and we found it very comfortable.
January 29, 20233 yr Author On 22/01/2023 at 12:47, Renegade105 said: Wow really? What do you think is the reason? What U value did you build to and was it open or closed? What’s you’re roof build up like? cheers 200mm between roof trusses - can easily feel draft movement 100mm between floor joists between cold garage and heated office - feet get cold in office
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