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loft type insulation is best- dense as possible (isowool?) to get 10kg/m3 + - rigid boards are less effective and more prone too transmitting sound rather than muffling it

the clue to the subject of the post is in the OP's opening message - dunno what kind of forum it would be if we just read the title and answered without reading the body of the message

are you having building regs approval for the loft conversion - i ask as the structural aspect of the loft isnt the only consideration (or are you just trying to satisfy the mortgage people - are thay happy with just the structure being ok?)

There is no zone at the bottom of the wall only in internal corners and at ceiling level @150mm from the junction

4 x 2 floor joists won't span 3.1m without a central support to cut it down to 1.55m, noway nohow Have you thought about whatinsulation you will be putting in for the floor as your joists should be at least the same thickness to support properly

FENSA only deal with replacement windows if you have existing veluxes that need replacing then you could use fensa registered installers as opposed to your LA but if they are new you can only use your LA anything else(. new openings for new windows, slightly enlarging exisiing openings...

celotex produce a 'handy guide' a5 booklet and ive quoted 90+25 out of therem - if you call them they will send you one For some reason their website only quotes for warm deck roof. A warm deckroof is good if you have difficulty getting cross ventilation - its a special TD3080Z celotex board...

ive seen them in action in a stair landing and i was impressed by what they provided

i take it you have been to the council and seen the plans for the roof which shows 6"x 2" joists @ 400mm c/c- yes? (bear in mind that the plans may not accurately portray the size of joist used on site to build the roof as builders often decide to do it a different way to what has been...

I wouldnt think a roofer/builder would be able to assess the structural integrity of modified roof trusses - a structural engineer is preferable the connection details are very important to its strength and builders/roofers basically just put the pre constructed roof trusses together like...

sounds like you have a new flat roof to insulate, am i right? - i think either of those options would do the trick - you must also allow another 50mm over the insulation for ventilation to flow through your soffit vents so your joists should be 190mm deep minimum. a better detail would be to...

you could use an insulated closer like thermobate -rigid stuff

If you mean e.g if you need 100mm celotex floor insulation you could use 2 x 50mm celotex boards to = 100mm ive never encountered a reason why not - has someon said something?? :shock:

Roof trusses are manufactured under factory conditions and designed to use the minimum timber to support the intended loads (e.g roof covering, some storage and some snow). Because they are produced in a specific way to support the design loads any modification to them needs to be carried out...

1. about 500MM (yes half a metre!)0.25 uval 2. 250mm in crossed layers 0.16 uval 3. same as 2.

entirely dependant upon the grond conditions and the loads you are putting onto the foundation then consider access and storage on site variables galore but normally strip foundations up to a depth of 1.5-2m

if you do buy it can i borrow it? :P

click me this place will help you out - sorry dont know how too shorten link _______________________ moderator edited to shorten link, (click here to see how its done) but linked to site only stores it for 15 mins (thats what it says)

you can reduce speech sound by adding fibreglass quilt between the ceiling joists - but footfall would require something like an independant ceiling below or adding a resiliant layer below the floor or adding extra plasterboard to the ceiling below making it denser. What are you doing for...

Unfortunately its not as easy as a size issue - thats only one of the considerations, several factors apply other than size e.g if it has less than 75% glazed roof or less than 50% glazed walls itll need Building regs, or if its open to the house it will need them too, or if safety glass isnt...