20mm d/g units meet bco approval?

[r.p.mcmurphy]

need to get some windows made. joiner asked how thick a d/g unit i want to fit. i want it to be as thin as possible, that the bco will allow.

anyone help?

steve

[zikkimalambo]

You either need to use a FENSA (FENSTRA?) registered double glazing firm, or else you or someone else needs to satisfy the BCO that the neccessary U values will be achieved.

You can't decide what kind of spec window /glazing unit to have until you know what U value you need to achieve, and this will involve calculations.