Hello,

Could someone help me with how to insulate a vaulted roof with
downlights? The rafters are 150mm deep onto which is a breathable
membrane. The insulation I was planning to use was 100mm kingspan
which will leave a 50mm airgap, Does that sound right?

But what to do with the downlights, just leave a gap in the
insulation?

Pete

On Aug 22, 7:37*am, Pete Crawford wrote:
Hello,

Could someone help me with how to insulate a vaulted roof with
downlights? The rafters are 150mm deep onto which is a breathable
membrane. The insulation I was planning to use was 100mm kingspan
which will leave a 50mm airgap, Does that sound right?

But what to do with the downlights, just leave a gap in the
insulation?

Pete

I think it will depend on the design of the the downlights and their
wattage/cooling requirements.

I installed a load of kingspan.
You can get seconds much cheaper (less than half price) available
everywhere. It has mechanical damages and voids. The voids can be
filled with canned foam.
http://uk.ask.com/web?q=insulation+s...=0&o= 0&l=dir

I found the best way to install it is to cut it a couple of cm
undersize and fill the gaps with canned foam. All these things about
cutting it to size or oversize and squeezing it in are useless.

On 22 Aug, 08:27, harry wrote:
On Aug 22, 7:37*am, Pete Crawford wrote:

Hello,

Could someone help me with how to insulate a vaulted roof with
downlights? The rafters are 150mm deep onto which is a breathable
membrane. The insulation I was planning to use was 100mm kingspan
which will leave a 50mm airgap, Does that sound right?

But what to do with the downlights, just leave a gap in the
insulation?

Pete

I think it will depend on the design of the the downlights and their
wattage/cooling requirements.

I installed a load of kingspan.
You can get seconds much cheaper *(less than half price) available
everywhere. *It has mechanical damages and voids. The voids can be
filled with canned foam.http://uk.ask.com/web?q=insulation+s...y&qsrc=0&o= 0...

I found the best way to install it is to cut it a couple of cm
undersize and fill the gaps with canned foam. *All these things about
cutting it to size or oversize and squeezing it in are useless.

Seconded on the use of expanding foam.

Cheers
Richard