Sliding doors, building regs & part L

[TC101]

Currently having an extension built & plan to have 3 pane sliding doors.

 

Building reg part L doc states these sliding doors must have a U value of 1.4 W/m2k

 

Very few on the market have this U value, most are around 1.6-1.9 W/m2k....but regs appear to state 1.4 W/m2k U value or C energy rating.

 

I've seen a lot of people have these sliding doors- So do they not comply with regs or they comply as its a C rated door? 

Any feedback appreciated.

[PNAmble]

What are the dimensions Of the opening s.  We looked at a three piece 6meter (each panel 2 meters) triple rail with our build which is passiv standards.  In the end the cost and Part O meant we tweaked our plans.  But there were a few suppliers who got down to 1.0 and then Cero III doors which got lower but cost was too high for us to consider.  

[nod]

BC understand this and will let it slide So to speak 

We have three sets 1.6 

[TC101]

Only 3.1m openings so nothing major.

 

Bifolds have a better U value but we don’t want those. 
 

 

[LiamJones]

You can offset lower performing glazing with higher performing glazing. E.g a 5m2 door 0.2 under notional with 10m2 of windows 0.1 above notional.