Vinyl Casement Windows
Deslano vinyl casement windows are side-hinged, crank-operated windows built on fusion-welded, multi-chamber uPVC frames. The sash swings outward from one side, driven by a geared rotary handle rather than pushed by hand.
Two things specifically differentiate a vinyl casement from casement windows in other materials:
Frame construction - vinyl frame corners are heat-fusion welded into a single continuous piece, not screwed or mechanically fastened at the miter joints the way most wood and some aluminum frames are. A welded corner can't loosen, gap or need re-caulking over time the way a fastened joint eventually can.
The material itself doesn't rot, corrode or need repainting - unlike wood casement, which needs periodic refinishing, or steel/aluminum hardware, which can corrode in coastal or high-humidity environments without added coatings.
Combined with perimeter compression sealing at every lock point, this is why vinyl casement is frequently the default spec for cold-climate and coastal residential replacement projects specifically - not just "casement windows" in general.
Sash size, chamber count, hardware, and glazing configuration are configured per project requirement.
What Makes This Product Different (Engineering Detail)
Fusion-Welded Corner Construction
Frame and sash corners are heated and fused under pressure into a single continuous piece of vinyl, rather than joined with screws, corner keys, or adhesive. A welded corner is structurally as strong as the rest of the frame extrusion - there's no mechanical joint to work loose from thermal cycling or wind load over years of use. This is specifically a vinyl-fabrication characteristic; it's not achievable the same way in wood, and most aluminum frames use mechanically fastened corners instead.
Multi-Chamber Profile with Internal Webbing
The frame extrusion has 3–6 internal hollow chambers (depending on the profile selected) separated by internal vinyl webs. Each chamber traps still air, which resists heat transfer, and each internal web adds rigidity - which matters specifically on a casement, where the frame alone carries the full sash weight through the hinge side rather than sharing the load with a track the way a slider does. More chambers generally raise thermal performance and stiffness but add wall thickness, which slightly reduces visible glass area - a trade-off to size against your performance target rather than defaulting to the highest chamber count available.
Dual or Triple Weatherstripping
Most vinyl casement sashes use two to three separate weatherstrip lines around the sash perimeter - typically a compression bulb seal plus a secondary fin seal - rather than the single gasket line common on basic casement or most sliding windows. Each additional seal line is a second and third barrier the same air and water would have to pass, which is part of why casement air-infiltration ratings tend to outperform sliding windows of similar size and glazing.
Multi-Point Cam Locking
The crank handle doesn't just release the hinge side - turning it engages cam-lock hardware at multiple points along the lock-side and sometimes top and bottom of the sash simultaneously, pulling the whole sash flat against the weatherstripping at every point at once rather than sequentially. This is what keeps compression even across a tall sash rather than tight at the handle and loose at the corners.
Weep Drainage System
Any water that gets past the exterior seal (wind-driven rain, condensation) needs somewhere to go. Vinyl casement frames include internal weep channels and weep holes at the sill that route that water back outside rather than letting it pool inside the frame cavity - a detail that matters more on casement than on some other window types, since the outward-swinging sash and exterior-mounted screen create a slightly different water path than an inward-opening or sliding sash.
UV-Stabilized, Color-Through or Capped Vinyl
The vinyl compound itself includes UV stabilizers (commonly titanium dioxide-based) to resist yellowing and embrittlement from sun exposure over years outdoors. Two finish approaches are available: color-through vinyl (the color runs through the full profile thickness, so scratches don't reveal a different color underneath) or a capped/laminate exterior finish for a wider color range. Which one fits depends on the color and finish requirement for the project.
Configurations
Standard Casement
A single outward-swinging sash, crank-operated, hinged on one side - the base configuration and reference point for the variants below. Fits most residential openings where one continuous sash covers the full width.
Push-Out Casement
Same outward swing, but opened by hand after releasing the lock instead of using a crank. Fewer moving parts, but without the crank's mechanical advantage - generally limited to smaller, lighter sashes than crank-operated versions can handle.
Double Casement (French Casement)
Two sashes meet at the center with no fixed mullion, both swinging outward on opposite hinges. Used specifically where the full opening needs to be unobstructed when open - over a kitchen sink, for instance - which a single casement or a slider with a center track can't offer in the same way.
Casement with Fixed Panels
An operable casement sash paired with fixed vinyl-framed glazing - side panel, upper transom, or both. Used on wider openings where full operability isn't needed across the whole width.
Bay and Bow Assemblies
Casement sashes are the operable units most often used on the angled sides of a bay or curved sides of a bow window assembly, with a fixed picture window typically anchoring the center. This is a structural, multi-window assembly built around casement units - treated as its own project scope with separate structural engineering, not a casement variant on its own.
Egress Casement
Sized and hinged to meet minimum clear-opening requirements for emergency escape (bedroom egress code in many jurisdictions). Minimum width, height and net clear opening area are driven by code rather than by proportion - confirm local minimums before finalizing bedroom-level drawings.
Technical Specifications
| Specification | Available Configuration |
|---|---|
| Opening Mode | Outward swing, side-hinged, crank or push-out |
| Frame Construction | Fusion-welded corners, multi-chamber uPVC |
| Chamber Count | 3–6 chambers depending on profile |
| Reinforcement | Steel or fiberglass insert for larger sashes |
| Locking Structure | Multi-point cam locking, simultaneous engagement |
| Sealing Method | Dual or triple weatherstrip lines, full perimeter |
| Drainage | Internal weep channel with sill weep holes |
| Glass | Double or triple insulated glazing |
| Safety Glass | Tempered or laminated available |
| Low-E / Argon or Krypton Fill | Available |
| Finish | Color-through vinyl or capped/laminate exterior |
| Grille Options | Grilles-between-glass, simulated divided lite, or none |
| Screen | Exterior-mounted, standard on outward-swing sashes |
| Size | Custom, subject to sash-weight and hinge-capacity review |
Vinyl Casement vs. Wood and Aluminum Casement
| Vinyl Casement | Wood Casement | Aluminum Casement | |
| Corner joint | Fusion-welded, one piece | Mechanically joined (screws/dowels) | Usually mechanically fastened |
| Maintenance | No painting/staining; occasional cleaning | Periodic repainting/refinishing | No painting; check fasteners/seals over time |
| Corrosion/rot risk | None (vinyl doesn't rot or rust) | Rot risk if seals fail | Corrosion risk in coastal/high-humidity settings without coating |
| Thermal performance | Strong, from multi-chamber design | Naturally low conductivity, but seams can leak | Needs thermal break to compete; conducts heat without one |
| Typical use case | Cold-climate and coastal residential, budget-conscious energy upgrades | Traditional/historic aesthetic priority | Slim sightlines, high-load or commercial-grade projects |
This table reflects general material characteristics; actual performance for any specific unit depends on its full construction, not material alone
Where It's Typically Used
Cold-climate and coastal residential - welded corners plus multi-chamber vinyl are specifically suited to environments where wood would need frequent maintenance and aluminum would need added coating protection.
Kitchens and hard-to-reach openings - crank operation opens and closes without reaching across a counter or fixture.
Bedrooms requiring egress - egress-sized casements meet code-minimum clear opening without the width a comparable slider needs.
Renovation/replacement - a common one-for-one swap for older wood or aluminum casement units where the goal is lower long-term maintenance without changing the opening size.
Customization
| You choose | We configure around |
|---|---|
| Sash layout (single / double-French / fixed+operable) | Opening width, center-post requirement |
| Chamber count | Thermal performance target, frame sightline width |
| Reinforcement (steel / fiberglass insert) | Sash size, wind load, hinge capacity |
| Finish (color-through / capped) | Color range, scratch-visibility tolerance |
| Glazing (double/triple, Low-E, gas fill) | Climate zone, acoustic requirement |
| Egress sizing | Local building code minimums |
Provide window dimensions, quantity, sash arrangement, chamber-count preference, and project location for a project-specific quotation
FAQ
Q: What actually makes a vinyl casement frame different from a fastened frame?
A: The corners are heat-fusion welded into one continuous piece rather than joined with screws or corner keys. There's no mechanical joint to loosen from years of thermal expansion and contraction the way a fastened corner eventually can.
Q: Why does casement seal better than a comparable slider?
A: A slider needs running clearance in its track to move, which is a permanent air path unless closed against a seal most sliders don't have. A casement sash instead compresses against two or three separate weatherstrip lines around its full perimeter when the cam locks engage - more seal lines than most sliders use at all.
Q: Do I need to worry about water getting into the frame?
A: The frame has internal weep channels and sill weep holes designed to route any water that gets past the exterior seal back outside, rather than letting it collect inside the frame cavity.
Q: Is a higher chamber count always better?
A: Not automatically - more chambers generally improve thermal performance and rigidity but add wall thickness, which slightly reduces visible glass area. Chamber count should match your performance target, not just be maximized.
Q: Will scratches show a different color underneath?
A: Depends on the finish: color-through vinyl carries color through the full profile thickness, so scratches don't expose a different layer. Capped/laminate finishes offer a wider color range but rely on a surface layer.
Q: How does vinyl casement compare to wood or aluminum for long-term maintenance?
A: Vinyl doesn't rot, rust, or need repainting the way wood needs refinishing or aluminum can need corrosion protection in coastal settings - though wood and aluminum each have their own aesthetic or performance reasons for being specified instead.
Q: What information do you need for a quote?
A: Dimensions, quantity, sash arrangement (single/double/fixed combo), chamber-count or performance target, finish preference, and project location.
Custom Vinyl Casement Windows from Deslano
Send us your window dimensions, quantity, sash arrangement, chamber-count or performance target, finish preference and project location for a project-specific configuration and quotation.Contact Deslano for custom vinyl casement window manufacturing and project supply.
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