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loft insulation guidance please

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muddysteve:
just dont put polystyrene anywhere near your electrical cables as it will make the insulation fall off them, just stick some rockwool in and nail some boards ontop "simples"

Mikieb1981:
have done this recently as part of a loft conversion which meets building control

Insulation of 100mm between the trusses use either celotex or similar,then insulation of 25mm over the top of the trusses, again celotex or similar, followed by plasterboard over the top.

You can use insulated plasterboard and do away with the 25mm insulation but its v expensive

A 50mm air gap must be maintained behind the 100mm insulation and the roof should have vented soffits and vented ridge tiles fitted.

There is a set u value which has to be met for it to comply with building control to be living accomodation and only the celotex or similar foil backed foam insulations will meet this.

If its not for living space then use rockwool as its lots cheaper, you can buy rockwool for cavity wall insulation that is denser than the normal stuff used for lofts, its a bit dearer but it will be easy to hold in place with string and hardboard over the top.
All depends what its used for and if you want to have it as living space should you ever sell the house.

winchman:
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best bet is to insulate the ceiling and put an extra jumper on when you go up there
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Thats the best thing to do, its cheap and will give you some storage.
I did all the proper things and still got condensation troubles so I would just do the above unless you are going fro a builder to do a proper full conversion

jay2578:
rockwool under the intended floor, celotex or kingspan boards(available in varying thicknesses) between trusses, maintaining an air gap between it and the felt. celotex and kingspan are cut with an old handsaw to a mm or two oversize and wedge in. no need for hardboard. if you need any more info/ guidance pm me and i`ll email you some drawings as i do this sort of thing all the time 

muddyjames:
cheers for the info. Waiting until next month to look at my bank and see if I have spare cash!

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