Re part L robust details requirement to fit windows with the frame
30mm back into the cavity / insulated cavity closer.

I'm fitting windows now (just done one) and to pre-2006 regs as it
happens. Frames are 70mm. To set back 30mm as is required for
post-2006 part L, leaves only 40mm against the outer leaf. Considering
the design of the PVCu profile and the desire for weatherproofing and
getting a firm fix, this is impractical. To drill very close to the
front of the profile does not really work, and drilling too near the
edge of the brick risks blowing the brick either when drilling or when
the frame fixings are tightened. In the end I set back the frame by
about 15mm.

Anyone fitted windows to these regs, and how did you do it to get a
secure fixing in the brick ?

Simon.