Cavity Wall support for sliding doors.

[Warrentdo]

Hello, I have a few issues here.

I have a cavity wall that is made up of 102.5 brick/50 open cavity/ 100 PIR/100 block.

I have a sliding triple door with approx. 185mm wide base.

I cannot have the overhang of the door into the cavity so i have put a magical piece of something there to bridge the gap (47mm thk). What can i use?

Basically im not sure what to do in the red circle. Any ideas please?

 

DPM (under concrete) and vapor layer (under screed) missed off.

please feel free to change anything but the cavity wall to DPC is already in.

 

[Mr Punter]

Where you have a door you can either reduce the cavity to 50mm or leave out the inner leaf and just have an upstand of 50mm insulation and run the concrete up to this.

[Warrentdo]

1 hour ago, Mr Punter said:

Where you have a door you can either reduce the cavity to 50mm or leave out the inner leaf and just have an upstand of 50mm insulation and run the concrete up to this.

Hello , so  like this? sorry if I've misinterpreted.

[Warrentdo]

Or 

[Warrentdo]

or even? . do i need to run the concrete base into insulation? i would have to knock the inner course of block off but no issue.

[Lift span]

This seems to be a recurring problem for which there is no optimum solution, that I've found anyway. Especially, if you are trying to avoid cold bridging.

 

One solution would be to infill your cavity with concrete and block (in your last picture) and then fix Compacfoam on top.  That comes in various depths including 50mm which is close to your 47mm.  

 

There is a discussion here:

 

http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16054

[Canski]

Why can’t you run the insulation up to the inside of the brick skin and put some 25 mm edge insulation agains the brickwork then screed up to the threshold ? 

[Miek]

One solution which might work.