uPVC casement windows.

Two casement systems: Casement 60 at 60 mm and five chambers, Casement 50 at 50 mm and three. A casement sash presses onto its gasket around the whole perimeter when it shuts, which is why it is usually the first system to discuss when noise or dust is the problem.

Systems: Casement 60, Casement 50
Published profiles: 14
Formulation: Lead-free
Titanium dioxide: 8 phr
Gasket: TPE
Profile warranty: 20 years
Standard referenced: EN 12608-1

A white uPVC top-hung ventilator above a side-hung casement, set in a stone-clad display wall — Fig. 01Top-hung ventilator above a side-hung casement

Before you specify

What has to be settled.

Opening size and configuration: How the opening splits into sashes and fixed lights.
Opening direction: Which way each sash swings, and what it clears inside the room.
Hardware: Hinges, handles and locks are chosen for the sash weight.
Glazing specification: Specified with the system, not after it.

Help me choose a system

Compression is the whole point

Closing a casement pulls the sash onto a gasket that runs unbroken around its edge. The hardware squeezes it there and holds it. Air, and therefore noise and dust, has no continuous gap to travel through.

This is a description of the mechanism, not a test result. TruFrame has not published acoustic figures for any system, and nothing on this site should be read as one. Where a number matters contractually, ask for the report and check its date.

Side-hung, top-hung and fixed

Side-hung sashes swing on vertical hinges and give the full opening for ventilation. Top-hung sashes pivot from the head, which lets them stay open in light rain. Fixed lights do not open at all and are used where the opening is for daylight rather than air.

Most real openings combine them. A common arrangement is a fixed light with a top-hung ventilator above it. The profile family carries all three, so the combination is a fabrication decision rather than a different product.

Choosing between 60 mm and 50 mm

Casement 60 is the deeper section with five chambers and nine published profiles. It has more room inside for still air, for reinforcement and for glazing, and it is the one to start from on a bedroom facing a road or an opening that has to carry a door.

Casement 50 is three chambers at 50 mm, with five published profiles. It suits smaller openings where a 60 mm frame would look heavy: bathrooms, stairwells and ventilators. If heat or noise is the deciding factor, compare the two rather than choosing on appearance.

Systems