Big G

@G and J have a look, i'm not too impressed with the drawings, don't think i'll be using the TR27.

Hi, does anyone have any experience with Thermaroof TR27? my warm roof drawings don't show a top layer of 18mm OSB, only shows OSB at deck level below the insulation. I'm confused, every video i've watched had insulation sandwiched between layers of OSB. Does this Kingspan product have a rigid top layer of some kind? thanks G

Hi Redbeard, a boring stud wall mate, sorry.

Hi, i'm glad i found this post as i'm in exactly the same position, My drawings have been submitted to the planning department but i'm looking at these drawings and thinking why? why a cavity only to fill it up with cement at finished ground level. My proposed extension will be made up with Timber with cement board external and finished with plaster or some kind. The strip under build to DPC is 100mm block outer / 60mm cavity and 140mm inner block. I questioned my architect on the matter and he came back with a reason "to give strength".....really? he's also drawn in some kind of ugly weather drip edge to cover the block outer leaf of the under build. Can anyone advise me if these drawings are indeed correct, but probably more important can anybody advise if after the plans are passed can i change the strip under build by simply talking to the building control officer.

Hi Everyone, I’ve just joined the forum and looking forward picking a few experienced brains regarding my planned all timber framed extension. cheers