So I've read a few threads on here in relation to overboarding, and there's mention of thermal bridges - I'd like to understand a little more and get comments / confirmation that my plan will work before I embark!
I have the following wall that I would like to make flush, and add some insulation to it (as it is an outer wall).
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I plan to run battens (bought at 2.4m lengths) up either side of the chimney breast from the bottom up, with 40cm spacing between them, so there will be 4 on each side of the breast.
I plan to fix the plasterboard horizontally onto the battens, and dab and dot the plasterboard onto the chimney breast.
Q1) I had planned to put insulation between the battens however I appreciate this leaves the chimney breast area uninsulated, so for the extra cost its probably more effective to just use insulated plasterboard across this wall - agreed?
Q2) If I did use insulation between the battens (which may occur for other parts later in the project) - what considerations should I give for a thermal bridge. Can anyone explain a little more about thermal bridges so I can understand it better (I think it will come in useful when I get to the window stool / sill area
Q3) I plan to paint on a few coats of "Thompsons damp seal stain block" around the top of the chimney breast - we've historically had issue with the flashing, and the brickwork is slightly damp still (though this is definitely historic, the flashing has been redone and monitored constantly over winter). Any other considerations I should give to using this product?
Q4) Given the length of wood (2.4m) I am using for battens, I plan to just add 9cm of extra batten at the top of the battens - or is it possible that's not even needed (no plans for coving or any pressure at the top - or is there risk of it 'flopping' if unsecured)
Q5) I plan to use treated wood for the battens (60mm depth) - would you say that this is sensible? would it be a compulsory choice for any outer facing wall?
Q6) I plan to use 100mm screws for the battens - does that sound right?
Q7) How many screws should I use per batten? - I was thinking 4?
Q8) The million dollar question - should I overboard the ceiling (directly to the rafters) before I start the walls? There's nothing wrong with the majority of the existing plasterboard, but its been wallpapered with superglue and I can't remove it
I haven't decided on whether it will be insulated plasterboard yet, but if I do use it, is the extra weight likely to be an issue?... Q9) Should I do 60cm batten spacing instead of 40cm?
Q10) after reading all of the above, is anyone thinking I should use vapour check plasterboard? or is that really just for bathrooms (Etc)?
Sorry for so many questions - any advice is welcome as always!