If I put kingspan or similar in the roof rafters will it keep heat in the house or will it all just rise into the attic and do bugger all for the house.

Cheers

it would keep your loft warm

Kingspan is awsome stuff.

So I'd just have a toasty loft and that's it, the rest of the house would not benefit?

Put it in the ceiling if you want your house warm, or you could use glass wool which is cheaper.

IF USING KINGSPAN MAKE SURE U HAVE 50 MIL ABOVE KINGSPAN & FELT FOR VENTALIATION OTHER WISE U WILL GET CONDENSATION

we had our house loft floor done with the normal itchy stuff and the house is alot warmer in the winter ,as all the heat aint escapeing,and kingspan is the best stuff around for insulating ,but its a tad to mutch£

Cheers guys, thought I could kill two birds with one stone, never easy is it (wouldn't be as much fun tho).