My opening is 1835 high and 1365 wide - there is a little variance in the width, I think mainly caused by the trim warping slightly on one side so it's actually 1365 wide in the middle, but at the top and bottom is 1368 so 3mm difference.
I plan to build the doors out of 4x2 CLS covered with 14mm thick T&G making the doors 52mm thick.
2 verticals stopping 11mm short of the floor to make fitting them easy as I'll simply rest them on a piece of 11mm plywood, 3 cross pieces located where the hinges will go and 2 diagonals for support make up the frame. The T&G will extend down at the bottom covering not only the 11mm gap, but also a little further to stop rain blowing underneath the door onto the floor.
Regarding the door overlap, I'm thinking of cutting a rebate in the frame of 10mm in the LH door and obviously 28mm out of the back of the RH door so that where the doors meet, the LH door will be 28mm of CLS and the RH door will be 10mm frame + 14mm T&G - not sure how much overlap to have here - I guess it depends on my next question.
What I don't know is what allowances/clearances I should leave? I read for internal doors around 2mm, but I guess that doesn't apply to an exterior door where things are likely to move about a bit so is 5mm enough either side and 10mm in the centre?
Anything else I've missed?
I plan to build the doors out of 4x2 CLS covered with 14mm thick T&G making the doors 52mm thick.
2 verticals stopping 11mm short of the floor to make fitting them easy as I'll simply rest them on a piece of 11mm plywood, 3 cross pieces located where the hinges will go and 2 diagonals for support make up the frame. The T&G will extend down at the bottom covering not only the 11mm gap, but also a little further to stop rain blowing underneath the door onto the floor.
Regarding the door overlap, I'm thinking of cutting a rebate in the frame of 10mm in the LH door and obviously 28mm out of the back of the RH door so that where the doors meet, the LH door will be 28mm of CLS and the RH door will be 10mm frame + 14mm T&G - not sure how much overlap to have here - I guess it depends on my next question.
What I don't know is what allowances/clearances I should leave? I read for internal doors around 2mm, but I guess that doesn't apply to an exterior door where things are likely to move about a bit so is 5mm enough either side and 10mm in the centre?
Anything else I've missed?