Flush Casement.
Heritage uPVC Window
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Flat face. No shadow line.
On a traditional casement, the opening sash sits proud of the frame — leaving a raised lip that casts a subtle shadow line down the elevation. A flush sash sits perfectly level with the outer frame, so the whole window reads as one plane. It is the smallest detail, and the one that separates a period window from a replica.
Combined with a deep bottom rail and mechanically jointed corners, the Liniar flush platform is the closest uPVC comes to a timber casement — and it is the only one Historic England will sign off in most conservation areas.
Mechanically jointed corners.
Mass‑market uPVC windows are welded at 45° and ground flat — functional, but you can still see the mitre line. A mechanically jointed sash uses a concealed steel corner cleat, so the woodgrain or painted finish carries through the joint uninterrupted. From two metres away, you would genuinely struggle to tell it from a freshly decorated timber casement.
Available with dummy butt‑hinges, peg stays, and stayed‑open positions — all the hardware details of a period window.
Specifications
Liniar EnergyPlus flush sash on a 70mm six‑chambered fully sculptured profile. Mechanically jointed sash corners using concealed steel cleats for seamless woodgrain continuity. Internally beaded with Q‑Lon continuous compression gaskets. Glazed with 28mm double or 36/40mm triple insulated units. PAS 24 enhanced security tested, BS 6375 weather rated. 10‑year product guarantee; 10‑year colourfast guarantee on woodgrain foils.
Side‑hung, top‑hung, or fixed light. Available as single casement, side‑by‑side pairs, multi‑light mullioned frames, or integrated with fanlights and transoms. Dummy butt hinge option for traditional appearance. Astragal bars, Georgian bars, leaded glass effects available. Suitable for conservation areas and listed building replacement consents.
Colour Options
Available in White, Anthracite Grained, and Agate Grey as standard.
Heritage Colour Collection with 30+ options including English Oak, Irish Oak, Chartwell Green.
