A 5-chamber uPVC window-and-door system, double-glazed, on multi-point German hardware. Specified for sea-facing flats, AC-critical bedrooms, and the road-facing windows that have to keep the highway out.
A sea-facing flat in Worli, a child’s bedroom on the Western Express Highway, a recording room in a Bandra apartment. Three briefs where aluminium — slim or domal — gives the wrong answer. Salt air pits the frame. Single glazing leaks AC and noise. The client refuses to replace the windows again in a decade.
Veka- or Deceuninck-class extrusion, 5 air chambers across the section depth. The chambers break thermal conduction and acoustic transmission — the reason a uPVC window outperforms a single-skin aluminium one on AC and sound.
A galvanised-steel core inside every vertical and horizontal — uPVC alone is too flexible for tall openings. The steel never sees the outside air, so salt-air corrosion has no path in.
Double-glazed unit — two panes of toughened glass with an argon-fillable air gap. Sealed in EPDM. Multi-point German lock gear (Roto, Maco or G-U) compresses the gasket at three or five points, which is what gives the window its acoustic and weather seal.
The system is designed against the three failure modes that retire a Mumbai sea-facing window early. None of them have a path into this profile.
A uPVC window is the sum of three specifications — the profile, the steel inside it, and the glass unit. We specify each to a European-system standard. The hardware is German. The glass is BIS 14900 toughened. The seal is EPDM, not vinyl.
Veka or Deceuninck extrusion, 70 mm system depth as standard, 88 mm where a heavier acoustic spec is asked for. UV-stabilised for tropical sun, white standard, foiled finish (woodgrain, anthracite, RAL) on request.
Roto, Maco or G-U lock gear. Three- or five-point locking that pulls the sash tight against the EPDM seal at every point — that’s what gives the window its 32 dB+ acoustic rating. Tilt-and-turn sash where the brief asks for it.
Double-glazed unit: 5 mm toughened outer + 12 mm air gap + 5 mm toughened inner. Argon-fill option for AC-critical rooms. EPDM gasket all the way around. The DGU is what carries the thermal and acoustic performance — the profile alone doesn’t.
Sea-facing flats in Worli, Cuffe Parade, Bandstand and the Juhu beach line. Road-facing bedrooms on the Western Express Highway. Studio and recording rooms in Bandra. AC-critical bedrooms where the family wants to sleep with the AC at a lower setting.
A whole-flat uPVC replacement on a sea-facing high-floor — every bedroom, the living room and the study. Foiled-anthracite outside, white inside, 24 mm DGU, multi-point German hardware. Salt air doesn’t touch the steel.
The 5-chamber uPVC doesn’t corrode. The galvanised steel reinforcement core never sees the outside air. A sea-facing flat in Worli stops being a window-replacement-every-decade conversation.
A 24 mm DGU on a multi-point-locked uPVC sash drops outside noise by 32 dB or more. Highway, helipad, school yard, train line — the bedroom is quiet enough to sleep with the AC at 22°C.
Two panes of toughened glass and a 12 mm air gap (argon-fillable). The room hits the AC setpoint faster, the compressor cycles less, the bill drops. Real numbers, not catalogue ones.
Roto, Maco or G-U lock gear pulls the sash tight against the EPDM seal at three or five points. That compression is what gives the window its acoustic and weather rating — single-point locks can’t carry the spec.
Veka- and Deceuninck-class profiles ship with a 10-year written warranty against UV degradation, yellowing and structural failure. The hardware carries its own German manufacturer warranty.
EPDM gasket all the way around the sash. Stays flexible through ten Mumbai monsoons; vinyl, which lower-grade systems use, hardens and cracks in three. Replacing the EPDM is a service call, not a refit.
Mesh is part of the system from day one — a slim cassette mesh on the inside of the sash, or a sliding mesh panel on a third channel. Not a bolt-on aftermarket frame screwed into the elevation later.
For a sea-facing flat where every window is being replaced — bedroom, living room, kitchen, study — one workshop, one BOQ, one snag list. The site coordinates against one fabricator, not three.
Suraj reads the drawing. No franchise, no call-centre, no rep filtering technical questions. The relationship is the brand.
No site-visit fee. No call-centre. No quote written before measurement. Suraj reads the drawing himself, walks the site within 48 hours of enquiry, and signs off the shop drawing before fabrication begins.
For a sea-facing or whole-flat replacement, the BOQ is staged room-by-room so the family can stay in the flat through the work — never two openings open at once, never a bedroom without a window overnight.
