High performance double glazed units are fitted as standard these are:
Argon filled 26mm, (4-18ar-4), U value = 1.0 W / m2K
For optimum performance the sashes are rebated to house up to a 48mm triple glazed unit:
Twin chamber argon filled unit, (4-18kr-4-18kr-4), U value = 0.5 W / m2K
Sound reduction for the standard unit is Rw = 31 dB with options to install acoustic glass for improved sound reduction at Rw = 34-42 dB unit.
Glazing options include: