upvc French Door - Timber Frame fitting

[Deano]

Hi , new member here.

 

Just starting the build of my new Garden workshop. I want to install an 1800 x 1800mm upvc french door (2.5m building height due planning regs so limited in how high I can have the doors) for the main entry and a side door for a sectioned off area for garden tools . 

 

Any pointers/gotchas? I've read up on timber frame door/window sealing, it's more about the positioning of the door front/back in the frame. The studwork will be 95mm deep with plasterboard on the inside, outside will be clad using HardiePlank Cedar. It seems most doors are 70mm profile?

 

As per the attached sketch, I'll be cutting the bottom stud and placing the door on that (I have allowed 10mm top/bottom and 10mm side/side for fitting). The floor is 18mm ply on 120mm joists. Should I just put something like tyvek flewxwrap on the bottom of the door frame to protect the floor/studs.

 

The roof will have a 500mm overhang at the front and is facing East so water penetration shouldn't be too much of an issue, but want to be safe and as weathertight as possible. Any issues going for a french door with no sill, or is that not a good idea?

 

Many Thanks,

 

Dean

 

[Russell griffiths]

This is slightly non standard construction really, so you will have to make a few things up as you go along, if you look at some American videos, you need to be looking for the making of a cill pan

probably similar to the Tyvek you describe 

I personally would flash all sides as well

can you not cut the cill plate down so you create a step to prevent any water running back onto the floor and then flash the step down. 

[Deano]

I will be flashing the sides.

 

Having looked at a few videos I think I am going to go with a cill for additional weather protection. It will be a bit more fiddly when the external cladding goes on, but thats not a big issue.

 

I could put the door direct onto the cill plate timber, I thought of doing it as per the sketch as I am a bit tight due to the height restriction. 1980mm from floor to roof, so with a door 1810mm high (inc 10mm for packing), 45mm for a top joist and 45mm bottom joist, that leaves 80mm for a header plus the french door cill plate, saying that it is only a glorified shed

 

Is this a better option?