Door Threshold Detail

RDWRER_

Can anyone help with a door theshold detail? This is retrofit of some wide patio doors in to a building made of 9 inch hollows. Old internal doors in to a now demolished conservatory are being replaced with new external doors and I need to build up the theshold.

In new build extensions in Dublin I often see builders stand a block on its side. I was planning to stand a block up roughly in the middle of the wall to give a decent internal and external reveal for rendering. Is this the normal way doors are fitted in to single leaf 215mm block walls here? I'm thinking it will leave me with a very awkward half step outside? I'd have to order the doors with a sill too as there would be no concrete sill like with a window. If so I was going to use a 140mm high soap bar as 215mm is too tall for my internal suspended timber floor. (pink block in my image below).

Lots of the images online are for brick cavity walls and want to get this right. My neighbours newish patio doors are done this way it seems Ta

10-10-20

Hi, is the DPC fully exposed? Can you lap a new piece of DPC around the back of the new block and meet up with the existing DPC with a good overlap? I wouldn't use a soap bar like that, it might be prone to cracking or moving.

What about two 65mm blocks on flat to give 150mm (130mm + 20mm) mortar across the threshold? Is that too high?

https://brooksonline.ie/7-5n-solid-block-440mm-x-215mm-x-65mm-ue2492

Otherwise one 100mm block on flat and then back-fill the required gap with concrete?

RDWRER_

Thanks for the help, yes DPC is exposed and covers the entire 215mm width.

My diagram isn't clear sorry but the black block at the bottom is that row with a dpc on top which i need to build up on top from (on top of dpc). The grey is one of the reveals either side of the opening.

I did consider 2x 65mm on the flat, it would work and give me the same height build up as a 140 soap bar (150mm). But then on the outside i would have a block on flat flush at the same level as the bottom of my door. I'm not sure how it should be finished, sill, step, etc. But either way if it is flush i foresee problems with getting a good looking finish.

I see stuff getting built all the time around Dublin with block on flat so there must be a solution i can't think of.

10-10-20

I think I'd work it out by measuring what you consider to be an acceptable lip on the threshold off the height of the internal floor (20mm let's say). Then get the total height of the lower threshold plus the sill and subtract the lip. Then that's your depth from the DPC to the bottom of the sill which you need to make-up using blocks/soap/concrete. Then look at the depth options on the sills as you'll need to provide good support over the depth of the sill as you don't want the external portion of the sill unsupported. Mine almost got damaged when some lads were bringing in a side-by-side fridge-freezer - I ended up making up a ramp and support for the sill before they cracked it.

Key thing is to get the DPC in properly too with a return up the back of the sill (example here: https://lockrollandtracks.com.au/leaking-sliding-glass-door-repairs/%29

Mellor

The DPC being exposed like that is a concern It needs some protection.
Also ground level to finishes floor level seems high.