Hi all,
I've had a look around various websites looking for the answer to my question and no luck. Hopefully someone here will be able to help.
I just about to start phase two of insulation our timber frame house.
Over the Christmas was put in 150mm of Rockwool in the external wall cavity. I now intend to put 25mm of Kingspan across the stud and then slab. I've decided not to use insulated slabs as I think I'll be able to achieve a better insulation finish with the separate Kingspan - i.e. no (or little) gaps between the Kingspan compared to the insulated slab boards.
My question: Do I use a vapour barrier and if so where in the insulation/slab sandwich does it go?
Should it go over my Rockwool but under my Kingspan?
Should it go over my Kingspan but under my slab?
Or do I need it at all??
should I just tape my Kingspan joint?
All / any help would be great
Thanks in advance.
I've had a look around various websites looking for the answer to my question and no luck. Hopefully someone here will be able to help.
I just about to start phase two of insulation our timber frame house.
Over the Christmas was put in 150mm of Rockwool in the external wall cavity. I now intend to put 25mm of Kingspan across the stud and then slab. I've decided not to use insulated slabs as I think I'll be able to achieve a better insulation finish with the separate Kingspan - i.e. no (or little) gaps between the Kingspan compared to the insulated slab boards.
My question: Do I use a vapour barrier and if so where in the insulation/slab sandwich does it go?
Should it go over my Rockwool but under my Kingspan?
Should it go over my Kingspan but under my slab?
Or do I need it at all??
should I just tape my Kingspan joint?
All / any help would be great
Thanks in advance.