Sliding Door Level Threshold Detail EWI

[LiamJones]

Hi. What do you think about this detail.

 

4m sliding doors to be installed 50mm out into the 100mm EWI. Supported by 4x2 screwed into masonry. aka picture frame.
 

Level threshold in and out. 
 

Other options I’ve thought about, compacfoam (pricey), keeping door on blockwork (thermal bridge)

[LiamJones]

Just noticed I’ve drawn it wrong, the outside limestone tiles will be level with the top of the threshold, like inside.

[Russdl]

No idea at what stage of the build you are at but our sliding doors are sat on a GRP angle which pretty much eliminates the thermal bridge. The GRP angle is tied in to our slab so may not be feasible for you. 

[LiamJones]

That’s a good idea, but yeah afraid I’m already poured putting doors in in a couple weeks 

[Russell griffiths]

The timber idea is terrible use something appropriate for sitting down there, compac foam or plastic angle. 
 

why can you not use the fibreglass angle. 
 

if your drawing is correct you already have a big thermal bridge from the blocks to the floor

Edited June 8, 2024 by Russell griffiths

[JohnMo]

I'm with @Russell griffiths, you have good cold bridge below your door. Notice you don't even have an insulation upstand for your concrete, that's an omission.

You need an insulation material in the door threshold that can take structural loads.

 

Compacfoam would be a good solution. You can screw this to the blockwork as you would have done with the wood.

[LiamJones]

ah yes, there is a 25mm PIR perimeter upstand

[LiamJones]

So replace the 4x2 with 100x50 compacfoam? Resin anchors into the blockwork? 400 centres? I can’t find a detail from compacfoam for level threshold in EWI. 

[JohnMo]

27 minutes ago, LiamJones said:

compacfoam

Is just like eps, but rock solid, just treat it as structural insulation. If you were specified 400mm centres for the wood, just do like for like.