Thicker kingspan or insulated plasterboard in 1907 granite stone house


Postby johnjross » Mon Sep 28, 2015 12:24 am

Im hoping someone can help. I have a 1907 granite stone house. I have removed all of the old lath and plaster and am looking to insulate everything. For my external walls I was considering framing the walls with 3x2 posts, then insulating with 75mm of kingspan and plaster boarding ontop. I have just been looking at insulated plasterboard and reading about thermal bridging. Would I be better to make my frame of 2x2 posts with 50mm kingspan and 25mm insulated plasterboard ontop?

Any advice is much appreciated.
John
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Postby welsh brickie » Tue Sep 29, 2015 9:28 pm

use 2x2 treated timber to frame the walls, insulate with 50mm kingspan , vapour barrier then stapled to the timber, then screw 12.5mm plasterboard
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Postby johnjross » Wed Sep 30, 2015 8:08 pm

Thank you, should I simply use 12.5 standard plasterboard or go extra and add insulated plasterboard if my insulation is only 50mm? On the assumption that more is always better?
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