Builder or roofer advice

[alarmeng]

Hi as above looking for some advice please.

Just ripped out the kitchen and decided to redo the kitchen ceiling too, took that down only to find that the old flat roof had been left on when they put the pitched one on.

So that had to come out aswell :-(

Any way what im after is some advice on the insulation of it, i want to leave it open and board the ceiling off at te roof height (If you get what i mean).

What type of insulation do you suggest that i use ?

I was thinking of king span but looking at a few sites im unsure the thickness of what i need.

Any advice lads and lasses please.

Gary

[Mr Pumpy]

Would have thought kingspan would be ok, use the thickest yer can without over packing it, you'll probably need some airflow up there.

Could you be able to use normal rockwool/fibreglass insulation??? it would be a lot easier to use, that kingspan is sometimes a wee bit fiddly as youve got to cut it with a saw.

[Bulld0g]

Kingspan m8. Leave a 2" gap between kingspan and roof tiles for ventilation and don't forget to use a vapour barrier also insulated platerboards will be a bonus.

[alarmeng]

Kingspan m8. Leave a 2" gap between kingspan and roof tiles for ventilation and don't forget to use a vapour barrier also insulated platerboards will be a bonus.

Hi fella

Appolgies but what is a vapour barrier?

Gaz

[caveman_nige]

A vapour barrier allows water vapour to pass through but not water droplets so it will breathe a bit like a waterproof coat - have a read of these mate

Vapor barrier - Wikipedia, the free encyclopedia

Housebuilder's Update: The Little Known History of the Vapour Barrier

[alarmeng]

Hi Fella's

Read the replies but still a little confused over this vapour barries and what to do?

The tosser who built the roof had put all the weight on the OLD flat roof so today ahs been making sure sure it dosent fall down whilst the mrs is cooking hahahaha

[gizmo.1484]

Hi as above looking for some advice please.

Just ripped out the kitchen and decided to redo the kitchen ceiling too, took that down only to find that the old flat roof had been left on when they put the pitched one on.

So that had to come out aswell :-(

Any way what im after is some advice on the insulation of it, i want to leave it open and board the ceiling off at te roof height (If you get what i mean).

What type of insulation do you suggest that i use ?

I was thinking of king span but looking at a few sites im unsure the thickness of what i need.

Any advice lads and lasses please.

Gary

You need to use 50mm insulation between the rafters so that the insulation as air space around it so the roof can breathe.

You do not need to use vapour barrier (Roof membrane). If you was to use it you would have to put it under the roof tiles, that would mean taking the the tiles off to put it on then replacing the tiles after, a lot of work.

What i would recommend instead of the vapour barrier (Roof membrane) is to us vapour board which is a plasterboard (Vapour board or vapour check plasterboard which has a thin metallic film on the reverse of the sheet. This film stops warm vapours passing through the board which could lead to condensation when they passed through to a colder surface. Commonly used when dry lining a building to keep it warm and well insulated.)

[alarmeng]

Gizmo

Many hanks for clearing that up now i understand it.

All thanks for the advice helped a lot.

Next to find a stockist.

Wish me luck haha