insulating an attic

[puzzlemaniac]

house is an old victorian semi, with light into the hall from a rooflight. rooflight walls are formed from lath and plaster on 70mm studs, but no insulation.

I want to insulate using kingspan between the studs, and then overlaying further 25mm sheets of kingspan, fixing to the studs. Is it worthwhile doing the overlay, or should I jsut fill in between the studs.

Also, there is an old chimneystack reduced to under roof height. Again, no insulation. Should I also cover all this in kingspan, or is it not worth the effort?

[The Builder]

As much as you like Puzzlers ............... to paraphrase Wallis Simpson........ "You can never be too rich, or too thin ......... OR have too much insulation"

Kingspan or Celotex, or have a look at the new multi-foil insulation . I use it a lot now....

bedtime reading ......... http://www.just-insulation.com/tlx_silver.html

[AlBags]

Belt and braces .. a bit OTT but you will notice a small difference compared to FG roll or Rockwool.

[puzzlemaniac]

Thanks for the replies. Had not thought on a foil solution. I assume I just feed it over the studs and lath and plaster, and staple to the studs' insides to hold in place?

[The Builder]

More or less, Puzz. I was doing the inside of a roof once, and the client likened it to "stapling a duvet to the ceiling" lol

Check out my link ............ fitting instructions are on there.

[puzzlemaniac]

will do, and it looks to be cheaper than kingspan / celotex, and will be easier and less messy. Thanks for the advice.