Part Q front doors

[MortarThePoint]

There are loads of companies that sell front doors and make no mention of Part Q compliance. I expect many BCOs turn a blind eye, but not mine.

My BCO pointed me at Part Q - Appendix B about making a bespoke door that will be deemed compliant. When I first read this I understood the <=230mm panel width dimension of B.5 to mean that there had to be <=230mm between structural timbers of minimum 44mm thickness, but looking at the example door below, the manufacturer's description says it has 6 panels and so each is well less than 230mm. The whole central portion is about 22mm thick and the distance between the outer stiles is about 500mm or so. What do we think, compliant because Appendix B doesn't insist on <230mm between stiles and mullions/stiles?

 

Has anyone had success in this area and is able to share some tips?

 

Generic Door anatomy/glossary:

Edited yesterday at 16:26 by MortarThePoint

[Russell griffiths]

That example is not adequate for a front door, I could kick those 22mm panels straight out. 
and where’s the insulation, again 22mm of timber isn’t adequate. 
 

my front door is probably 85-90mm thick on the stiles. 

[MortarThePoint]

Good point, there is no thermal information and being 22mm thick oak the U-value would be something like 8W/m2.K

[MortarThePoint]

U-value of the door needs to be max. 1.6 W/m2K. If it has a PIR core that would be 13mm thick. If using mineral wool or wood fibre insulation about 22mm thick. This means a compliant door needs to be about 28mm/37mm thick at its thinnest (13mm/22mm of insulation and 15mm on panel).

Edited yesterday at 16:44 by MortarThePoint
Updated for limiting Part L values