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loft insulation guidance please

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muddyjames:
I have gone into my loft this weekend to board the centre section out to make it easier when I am up there. Down side to this is that I couldnt fit the double thickness of insulation down as it wouldnt compress thin enough. So the plan is to move the left over insulation to over the bedrooms which wil make them tripple insulated and insulate the roof trusses (the bits with the tiles above them) in the centre section mainly to compensate for the lack of insulation below.

I was going to buy pannels of polystyrene loft insulation that was half the thickness of wood so air can still get between the felt and polystyrene and put hard board up to hold the poly in place. Mum was talking to a friend the other day who said I should use thin boards that are covered in silver foil each side and lay them 90 degrees to the trusses. Which way is best?

It all looks like I may have a very very tiny leek in the loft too as the felt is wet and after last nights rain there is about a cm in size wet patch on the boards I laid yesterday. How much would it cost to get a bloke up there to have a look? It may just be a tile has slid down?

Llanigraham:
There is a move against polystyrene insulation due to its fire problems. You can buy specific insulating panels but I can't remember their name. (something foreign)
Agreed, that if you are putting a lining up it is at right angles to the trusses.

Get the leak seen to first, what ever you do!

discosteveo:
go to yr local builders mechant and ask for xtratherm its the good stuff, fire resistant ,high thermal rating and not itchy because its foam

oh some times they may tell you to try viagra when you ask for xtratherm HAHAHA????

muddyjames:
xtratherm looks good but I cant find any prices though. I bet it isnt cheap. :-( they also show it running in the same direction as the trusses unlike advice given above. confused now.  :-k

Range Rover Blues:
People run it across the trusses because it's easier that way, if you run it up and down then you need something to brace the joint as the rafters aren't often very thick.

I'd avoid anything that is a fire hazard though, a fire in the loft will go hellishly quick as I withnessed last half term when a house near the school burned down in just over an hour.  Started high up and whent through the loft.

TBH, once you have the loft boards down I think you'll find the loft is very cold anyway, I was looking at a protective/insulating treatment for the exterior but it's about 5 grand initially (pays beack in about 5 years) that would also sort out any leaks and prevents concrete tiles form absorbing waterm which is an issue with heavy snowfalls etc because the tiles get very heavy when they are wet.

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