large slider threshold thermal bridge

greenfit

Hi everyone. I hope someone on here may be able to help



I am working on a project with very wide triple glazed sliders (one door is 6.8m wide :eek:) and both the builder and the window-supplier are insisting that the doors sit entirely on a concrete upstand. I have modeled the detail in Psi-therm with insulation vertically on the inside and outside of the upstand and it still comes in below the Part L minimum frsi of 0.75.


The only way I can see to reduce the bridge is use a thermal block or foamglas as the threshold but only obviously if the load can be taken. Has anyone installed large and heavy sliders on a quinnlite block or some kind of structural insulation like foamglas or compacfoam?


Thanks

BryanF

Install on foamglas but with bolts through to concrete ?

Dudda

Is that one piece? I've put a one piece timber aluclad triple glazed 5.8 x 2.7 meter wide one on thermal blocks on the flat for a client. I really don't think you need a concrete upstand but can't be sure without more detail. What's the window company or make of the window? I only know of one company that can make one that size and it has to be reinforced pvc not timber.

sydthebeat

can you do it with two steel "C" channel beams with insulation in between?

like this but with insulation rather than timber