Ceiling, frame joints and rockwool....

IF you can't find actual "sill seal" (trade name IIRC) you can use a couple layers of 30 pound roofing felt (heavy tar paper) - you don't need a perfect seal for the frame, the only requirement here is to have a Thermal Break. This keeps condensation from the bottom of your framing wood. Your actual seal will be around the edges of the wallboard itself - see the two threads in the REFERENCE section for more on that. If you can do a basic sketch of your floor plan showing where you're talking about on doorway, it'll help... Steve

I've attempted to show what I mean with a bad sketch... haven't had time to work this software out yet I'm afraid. Hope it makes some sense.... Cheers James

James, seeing as you're just getting started with drawing I took pity and resized your sketch - if you cut out all unused white space you don't lose any detail, just makes it small enough we don't have to scroll sideways to read every post on the thread :evil: Next time, YOU get to do it - 750 pixels wide OR LESS, please :wink: I'm thinking you have some terms mixed up by what you're calling things in your sketch - both of your walls with doors would need frames, with plasterboard only on the inside of the inner frame and the outside of your outer frame, like the wall on the far right of this... Steve IF you leave a couple inches between frames, that will make the total air gap around 9 inches which is about minimum for decent isolation. (Total air gap is measured from inner face of plasterboard on one frame to the next solid panel (inner face of plasterboard on the OTHER frame), so standard 2x4's being 3.5", twice = 7", plus a 2-inch space between frames... Steve