French casement window in Aluplast Ideal 4000

The Ideal 4000 is Aluplast's flush profile. Frame and sash sit in one plane, without the recessed sash of the block profile, and the window doesn't need a rebate. The frame is 70 mm deep, divided inside into five chambers with a double seal, and the outer frame has a closed steel reinforcement as standard. For a complete window with glass of Ug 1.0, the system data give Uw 1.3 W/m²K — the same as the deeper Ideal 7000 NL.

Flush uPVC profile, 70 mm deep with five chambers: clean-lined, without a rebate and affordable, for windows, doors and every front door.

In a French casement, two sashes meet without a mullion that stays fixed in the frame: open, it is almost a pair of doors.

A standard double window has a mullion that stays in place even when the sashes beside it open. A French casement doesn't have one: both sashes are hinged at the outer edges and close against each other in the middle with a draught seal, not against a fixed mullion. Closed, it looks like an ordinary double window; open, the whole width is clear, with no mullion in the way. If you're replacing an existing window without a mullion, you'll recognise this form straight away: it is the one that recreates that look.

Both sashes here are side-hung casements that open inward, not tilt and turn: you get the full opening, but not the tilt position for an ordinary gap. The standard size is 1,600 × 1,500 mm. If you want the same wide opening with a tilt position on one or both sides, look at the standard double windows (the 2-pane window with one tilt and turn sash, the 2-pane window with two tilt and turn sashes), which have a fixed mullion.

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