Rosewood uPVC Window – design 24

Description

Rosewood uPVC 4-Light Storm Casement Window — Bold Bilateral Ventilation, Wide Central View

A Window That Commands Attention

Wide wall openings demand a window with architectural confidence — one that fills the space with purpose, character, and presence rather than simply glazing the gap. Our Rosewood uPVC 4-Light Storm Casement Window delivers exactly that. Two full-height side-hung casements open powerfully from both outer edges, two wide central fixed panes present an unobstructed panoramic view at the heart of the frame, and the deep rich Rosewood woodgrain finish ties the whole four-light composition together with the warmth and depth of traditional timber joinery — without a single maintenance obligation attached to any of it.

Two Full-Height Outer Casements — Bilateral Ventilation at Full Scale

The two full-height side-hung casements on the far left and far right of this window are the ventilation engine of the design — and they operate at the most generous scale this frame family offers. Each casement spans the complete height of the outer section from sill to head without any horizontal rail dividing it, creating a ventilation aperture that extends from the very bottom of the frame to the very top when fully open.

When both outer casements open simultaneously — the left swinging outward on its left hinge, the right on its right hinge — the result is bilateral full-height ventilation across the complete width of the outer sections simultaneously. Fresh air enters from the left and the right at every height level simultaneously, from floor to ceiling, creating a column of incoming airflow on both sides of the frame that circulates through the room far more effectively than any single-sided or partial-height casement arrangement. For large rooms, open-plan spaces, and wide extensions where a single opening on one side fails to reach the far corners, this bilateral full-height arrangement makes a perceptible and immediate difference to air quality and thermal comfort.

Both casements operate completely independently. Either can be opened alone for single-sided ventilation, partially opened for controlled airflow, or both opened fully for the maximum bilateral effect.

Two Wide Central Fixed Panes — The Panoramic Heart

Between the two outer casements, two wide fixed panes span the central section of the frame side by side, divided by a single slim central mullion. This central glazed section is the visual centrepiece of the window — hardware-free, uninterrupted at eye level, and devoted entirely to the view and the natural light.

The slim central mullion between the two fixed panes is sized to the minimum structural requirement of the 70mm profile, keeping the visual division between them as unobtrusive as the frame allows. At seated and standing eye level — the height where the garden, terrace, or outdoor aspect is most directly experienced — both central fixed panes are completely clear of any frame element within the glazed area. The view through the central section is wide, clean, and continuous across both panes simultaneously, presenting the outdoor space at the heart of the window without division or distraction.

No handles sit in the central sightline. No hinges appear at the inner edges of the central section. No vent indicators suggest mechanisms that do not exist within the fixed glazing. The central section is simply clear A-rated double glazing at its widest extent, framed on both sides by the Rosewood outer casements and bordered above and below by the Rosewood head and sill.

The Storm Casement Arrangement — Three-Dimensional Character

The outer casements in this design are set within their own sub-frames — the defining characteristic of the storm casement configuration — which stand slightly proud of the central fixed section and create a layered, three-dimensional appearance in which the outer sections have their own structural identity separate from the central glazed core.

This layering is what gives the storm casement its distinctive architectural character. The outer sub-frame stiles and heads cast shadow lines at the transition between the outer casements and the central fixed section — giving the window a visual depth and richness that a flat four-light frame without sub-frame layering simply cannot achieve. At the scale of a four-light window spanning a wide wall opening, this depth is particularly visible and particularly important to the overall quality impression the window makes on the elevation.

Why Rosewood Transforms This Configuration

In Rosewood, the storm casement sub-frame layering takes on its fullest visual expression. The deep rich brown of the Rosewood woodgrain finish runs across the outer sub-frame stiles and heads with a darkness and depth that makes the shadow lines between the outer and central sections more pronounced and more dramatic than any lighter-coloured frame would allow. The contrast between the deep Rosewood frame elements and the clear double glazing they surround is at its most striking on a wide four-light window of this format — bold, warm, and immediately impactful from any viewing distance.

From the street, the deep Rosewood border of the outer casements framing the wide central glazed section reads as a window of genuine quality and heritage character. From close up, the woodgrain texture within the Rosewood finish — catching light differently at different times of day — gives the frame a visual depth and dynamism that flat-surfaced or painted frames cannot replicate.

Thermal Performance Across All Four Lights

All four panes in this double glazed uPVC window are manufactured to the same A-rated thermal specification. The 70mm multi-chamber uPVC frame, 28mm argon-filled sealed units, soft coat low-E glass, and warm-edge black superspacer bar deliver a U-value of 1.3 W/m²K consistently across both outer full-height casements and both central fixed panes — meeting Part L Building Regulations throughout and delivering genuine sustained reductions in heat loss across a wide glazed opening.

The storm casement sub-frame transitions — where the outer sub-frames meet the central fixed section — are manufactured to the same thermal standard as the main frame, maintaining consistent thermal performance at these junctions and preventing the localised cold zones that develop at sub-frame transitions in lesser profiles.

The Rosewood Finish — Warmth Without Upkeep

Our Rosewood uPVC windows carry a factory-applied woodgrain foil co-extruded with the uPVC profile that will not peel, fade, crack, or lift under any weather or UV exposure conditions. The profile carries a full 10-year guarantee against discolouration, warping, and deterioration. Maintenance is limited to an occasional wipe with a damp cloth — no painting, no varnishing, and no seasonal upkeep of any kind across the full four-light width of the frame.

Security on Both Outer Casements

Both full-height outer casements are independently secured with multi-point locking systems engaging at multiple points along the full height of each opening edge — from sill to head — providing robust resistance to forced entry across the complete length of each opening. Lockable push-button handles are fitted to both casements as standard. All four panes are retained by internal glazing beads throughout, preventing glass removal from the exterior on any section. Patented double-action bubble gaskets run the full perimeter of both opening casements, maintaining consistent weathertight seals in all conditions.

Specification at a Glance

• Energy Rating: A-rated | U-value 1.3 W/m²K
• Configuration: 4-light — full-height side-hung casement left, two wide central fixed panes, full-height side-hung casement right
• Frame System: 70mm multi-chamber thermally efficient uPVC
• Glazing: 28mm argon-filled units, soft coat low-E glass, warm-edge superspacer
• Locking: Multi-point locking on both outer casements
• Handles: Lockable push-button handles on both casements
• Beading: Internal across all four panes for maximum security
• Gaskets: Patented double-action bubble gaskets on both outer casements
• Finish: Rosewood woodgrain — guaranteed not to discolour, warp or peel
• Compliance: Part L Building Regulations
• Guarantee: 10-year profile guarantee

Made to Your Exact Measurements

• Frame Width: 415mm – 700mm
• Frame Height: 800mm – 2200mm

Every window is manufactured to order to your precise dimensions. Enter your measurements at checkout for a perfect made-to-measure fit across the full width of your opening. Our team is available for sizing queries, storm casement configuration advice, and specification details before you place your order.

Bilateral Ventilation, Panoramic View, Rosewood Character — All Four Lights

When a wide opening calls for powerful ventilation from both sides, a wide unobstructed central view, full-height glazing from sill to head, and a frame finish that makes the elevation genuinely distinctive — this is the window. Two full-height outer casements opening simultaneously for the most powerful bilateral ventilation in the range. Two wide central fixed panes presenting the outdoor space without division or hardware. And the deep warm Rosewood frame giving the whole four-light storm casement composition the heritage character and visual authority that make it one of the most commanding and most completely specified designs in our entire Rosewood uPVC window range.