zoothorn

Ok so I wait for spark to do his work 1st, before I do insulation? (both ceiling here -and- the walls too?). Can you explain what "de-rate cables as its in the insulation" means? (actually tbh I cannot make sense of the whole of the 2nd sentence). I will have about 5 overhead spot lights (flush-mounted round ~8cm types). Isn't frame-therm the 'orange loft stuff' tho that my builder suggested a huge pain to use, as it'll fall out? not sure. I really need the best-working-material here, or I see a nightmare keeping it up in place: I think this was the builder's thinking. Thanks, zoot

So what's the way to go here. I need to establish: do I put in rockwool before electrician runs cable within/ across joists: can I fill the 'cavity' of the actual joists (pic below): what rockwool, as I have to cut it bang on 1/2 point (of 600mm width).. IE if cutting is an issue/ nasty job etc. I have 4200mm x 3800mm total ceiling (wall to wall). Joists are 100mm width. Gaps between joists are 300mm W. The height of my gaps, is 205mm.. so I could squash in 200mm slab, but then hasn't the electrician not got ample room to work? also means slight pressure on the pB (a tricky job as it is, me + someone to do ceiling). So I might go for 140mm or 180mm rockwool. Thanks, zoot

Ok so this is called a 'slab'.. is this the right stuff? https://www.insulation4less.co.uk/rockwool-flexi-slab-140mm-x-600mm?gclid=EAIaIQobChMIztOL-KqX5wIVxLHtCh1e2gOOEAQYAiABEgKq8PD_BwE

Ok PeterW will go for that. I'll only be able to get 100mm in tho, as whole floor is only 150mm (specified to save every cm, for max room heights). Can you remind me, what goes in 1st: the rockwool > electrics? or vice-versa. So what I'm doing is filling my dividing floor, from below UP, stuffing into the gaps between joists (hope to get some in joists themselves too if I can). I presume i can't do this once cables passed through the joists, as I'll be hindered by them?

Now this orange stuff actually has "acoustic" in the wording. Wouldn't this be beneficial, over 'mineral wool' (or is this mineral wool.. & therefore has sort of been suggested?). Or is this th verye stuff that'll fall out/ a pain to use pushing up into between my ceiling joists? https://www.jewson.co.uk/building-materials/thermal-insulation/loft-insulation/products/IUAR2075/ursa-acoustic-roll-85m-x-1200mm-x-75mm/

@PeterW so going fwd, I'm going for standard mineral wool for this ceiling then afaict. Nothing acoustically-extra as I thought might be worthwhile. So 'mineral wool' has many variants. I seem to recall my builder suggesting one standard type (not poss to ask him Q's now) but not t'other.. something about falling down/ out whilst putting in, IE ease of the job. Would he likely be saying use 'rockwool' & don't use 'orange loft stuff' (whatever this is called exactly- glass something?). Does that make sense?

Hi PeterW. Ok understood. Ive only got one double bed upstairs tho.. only that/ not like a floor of futons to help. I believe I have the 'usual orange stuff' /rolls laid perp to each other in the loft, on the pB ceiling in room above (think it was blue/ yellow wrappere'd bales of this stuff). So no more suggestions then than just "mineral wool"? Is this the same orange stuff in my loft? Your suggesting of 'soundblock plasterboard' I think is using on the walls (in which case why not choose/ suggest for the dividing floor ceiling, if the walls are already known to be the strongest area-?). I will look into 'soundblock plasterboard', & 'mineral wool' tho.. thanks.

Hi Moonshine. Yes, this area [ insulation from the workshop to the room] is what I am asking about. Because I have some mass in the walls (& I'm constrained re. the insulation/ its designated: kingspan) any suggestions re. what can/ could ideally be used to fill are redundant. I'm not asking about doors, or windows either bc I can only do so much (little, but they're at least facing opposite side to n'bors). Its not an issue -for myself sleeping above- bc I'm only one person in the house: this is not the point. Its sound escaping the house > to my n'bors: this is the only point. So there's only 1 area left sound can escape, that I can influence (& seems a very weak point too). Up. Through currently just 22mm of chipboard (dividing floor) >> up through the room above >> up via its ceiling (already plasterboarded & usual loft wool stuff/ done) >> out via loft > roof slates. Hence my thread as to what choices I might have to put in this dividing floor ceiling. Its the only section I have available. -------- Can you tell me whether your suggestion of 'mineral or glass wool ': were you referring to suggesting this for my ceiling (the dividing floor section I am only concerned with here).. or were you perhaps suggesting it for my walls ? thanks- zoot.

Ok can I go back to the one suggestion so far. Moonshine: are you here suggesting using 'mineral or glass wool' for the ceiling I'm asking about? Or are you suggesting in reterospect it -would have been better if- I had used this stuff in the walls? (as I said, the walls have already been determined will be kingspan, as afaik the BCO determines what material & thickness .. not a choice I have). Its not quite clear as to what you are specifically referring to with regards to your suggestion. Thanks. zoot.

Hi Jimbo (appreciate comms there- I get so few folks saying this, I s'times question my own sanity). Yes whole point -is- that for the item I make for work, 1/2 of its total work per item is a consruction of wood (nasty bit- dust). The other 1/2 of the work for this item I make.. is quiet detail work (nice bit- no dust). So in effect -half- of my work, not hobby-work, is to be done within the room in Q.

Possibly not. But it didn't stop first a very stressful letter -potentially- threatening xyz.. & also a follow up council visit here. As council/ police have to follow up any complaint with a visit, my n'bors take advantage of it: more than 2 couples consistantly over 2.5 yrs instigating visits from every single dept they can think of, soley to cause me stress, less that they'd actually likely get any results. And it works. Every time the doorbell rings I get depressed/ dread fills me, another council man? they even got police visit me only weeks ago (due to my damn builder). And they think each is perfectly justified too. So in order to live here with as much relaxation as I can (not alot tbh) I need to mitigate against council visits, as best I can.

Ok I made the back-side of extension, facing them all, with no windows. So that's great what you say about my block wall (only one skin of course tho) doing something. Good. So my thinking is the noise this side then, will mostly be eminating 'up > out' (due to only a layer of chipboard at the mo -dividing floor- at least some minimal containing within the bedroom ceiling -usual loft stuff- & a smidge last bit being the roof tiles).

Even better Q Joe! they deserve SO much.. but, from one of them I had a noise complaint (router, C'saw etc used outside.. no more than 1+ hr/ day tho on average & nearest is approx 30m away: all detatched houses.. but many retirees) so need to do all I can to avoid the 'next council letter/ visit': actually the primary reason to build a 'workshop' of sorts, as an extension.

Ah good Q, sorry I wasn't clear. Just to outside (only me in house/ top room my bedroom).

Hi moonshine. You mean put mineral or glass wool in the ceiling? Yes i assumed kingspan probably not any good acoustically- but what can I do if its what I'm told to put in walls by BCO.. max poss in my case.

I have a 2 story extention, bedroom above a small workshop. Pitched roof. Timber frame shells > cavity > block cladding/ render. The lower room I want to put workbenches, use routers etc in/ only room I need as much "sound containment" in as I can. Door I've made thicker/ put insulation in.. a start. It has 1 pesky window in (not planned to, but BCO forced me to have one put in). Sound-proofing.. would be nice, but ££unrealistic. BCO told me to put in 140mm wall kingspan, so this to do. The ceiling: I have a dividing floor simply made of 10x joists of a timber top/btm + alu side brackets. 22mm Caber+ bedroom floor ontop of this. So I have to put insulation in the ceiling. What are my options? Is it worthwhile putting some acoustic-property stuff in here? Thanks zoot.

Ok thanks Peter & jfb.. understood/ seen XPS & it looks just the job. But whether either of my 2x only merchants can get it.. but provisionally going with this stuff then. Can I ask again tho: as the idea's -totally- dependent on my BCO being happy with the innitial 50mm C'tex/ 22mm board floor I lay. So do you think these Caber+ boards could be laid & joined without glueing together, & not either look or feel odd underfoot/ or loose/ or anything suggesting to him they're not properly done > redo please? if I have to redo & glue.. whole idea is ruined & I can never redo.

I add some musical relief, by way of a sort of "zen/ calming" interlude:

Ok understood Peter, thanks: if my only realistic option of 'something minimum' at the least insulating between my wood floor & slab instead of my 50mm C'tex already got, is likely 25mm, then with the added cost of buying this in (& removing floor & reusing the C'tex) just for 1" height gained.. it can't be worth it. With the stress of trying to figure out what PeterW was on about re. a "heated room" I just can't cope after the massive stress & hassle of the build/ the builder I'm not yet finalised with (he's not giving me the bill promised dec19th, I know to cause added stress/ dragging out/ likely providing an excuse [time] for him to conveniently deny we agreed he'd do X & Y jobs as compromise for me).. I have to forget this idea & just go with what I have > glue it together/ be done with it.

Ok thanks for the link here. But again I'm left not exactly sure of my floor situation, & the suggestion/ link provided. So, are you: suggesting this could be a substitute for my 50mm C'tex my BCO has specified me use @ a similar 50mm thickness? suggesting a thinner substitute to my 50mm (in wehich case IOd need top ask my BCO > who'd likely just say "no- I said 50mm C'tex/ do what I sday or I get in a huff, ok?") ? suggesting this can be used instead of both materials, the 22mm board & the 50mm C'tex-? (in which case I can't.. bc I have my two materials paid for/ stacked ready) ? or suggesting this could be used on my ceiling-? PeterW's been the most helpful to me of all, over my threads (& Onoff et al) but I get stuck when I cannot understand something he writes (& try my hardest to explain why its ambiguous to read), nothing more than that, & he > takes offence > says do it my way/ you know best then > & gone. Catch22. I wasn't ever trying to counter his information with my own (how could I, if I make it crystal clear I'm a newbie, trying to learn the basics: Id never be so audacious / arrogant?).. I was just frustrated at not understanding X which wasn't made too clear, asking, but it not being clarified. Information is hugely appreciated.. but if its not clear (seemingly in the building arena with 1000's of items & methods) it can be extremely difficult to comprehend with only limited skills. Thanks all- zoot.

Hi Roundtuit- but if you are referring to a 'heating system' I don't think this matters from the BCO pov. He just checks the build & then its my decision is I put in electric rads, gas rads, whatever rads. I have had many visits from the BCO: not once has he mentioned "heating", "heated room" or "unheated room".. or asked what I plan to put in either room with regard to radiators. I'm not quite sure why you're mentioning the heating.. unless you're referring to these two words 'heated-room' & 'unheated-room'? (which afaict are getting me completely & unneccessarily very confused).

I just need to to go back a step, & simply ask again: Is it feasable to lay the board floor on the 50mm C'tex (the BCO's demand), without using the glue stuff? If they're glued together I assume I cannot rip the floor up & / or will have stuck to the C'tex sheets ruining them too. Many thanks chaps.

(hi chaps- sorry ill yesterday). This (^) I perfectly understand, & is the position I am in.. But to continue saying by "but it will not meet building regs if I rip up the floor.." is so bafflingly not applicable I cannot understand why you are even mentioning it. I know of course it won't meet building regs once I rip up the floor, but its of no consequence if its been signed off! so why anyone is talking about this stage after having been signed off (& deemed an 'unheated room' then? I don't know, but why should I care if BCO isn't visiting anymore-??) as if it has consequences.. is utterly bewildering!!

Can anyone else just help out here. Do I have a "heated" room, or an "unheated" room?

I dont Peter! please dont assume I'm telling you anything of the sort! you keep assuming xyz (that I didn't know why I was told to put 140mm in walls for eg). Please don't assume I'm anything but trying desperately to pick my way through your info. I just cannot understand what you are saying/ I'm tearing my hair out trying to understand your posts. If I can only read what seems to me to be you saying in one sentence I have a heated room, then the next that I have an unheated room.. I'm left thoughrally confused. Please, it just needs you to clarify. That's all. You are likely not saying both these things.. but only one.