Aluminium domal sliding window in a Mumbai apartment

Service Profile · 27×65 Domal Window

The standard window. Done properly.

The 27 × 65 mm domal sliding window — Mumbai’s bread-and-butter spec — fabricated to a tolerance the builder didn’t bother with. EPDM-sealed against monsoon, SS 304 rollers, multi-point latch. The everyday window of a society flat, finally executed right.

Send the dimensions

Or call Suraj — +91 98703 08481

Section

27×65 mm

Track

2 or 3 track

Glazing

5/6/8 mm

Panel span

Up to 2 m

Rollers

SS 304

Finish

Powder-coat, any RAL

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Chapter 01 · The Problem

Three answers that
aged like the building.

Most Mumbai society flats wear the same window — a builder-spec 27 × 65 domal slider, fabricated cheaply, installed quickly, leaking by year four. The flat that was sold "premium" feels cheap two years in, and the family doesn’t know why.

Designers don’t always need the slim 16 × 45. Sometimes the brief just calls for the standard, done properly.

The builder-spec domal

The right section, the wrong fabrication. Leaks in monsoon, the rollers seize at year four, the latch slides out of position by year six.

ii.

The no-name market window

A nameless extrusion, mild-steel rollers that rust, no monsoon gasket, no EPDM at the meeting stile. Replaced inside ten years.

iii.

A wood-frame window

Right look, wrong material for a Mumbai monsoon. Swells, warps, peels — and re-painting is a four-day site disruption every five years.

iv.

The fourth answer

The same 27 × 65 section, fabricated to a real tolerance. EPDM monsoon gasket all the way around, SS 304 ball-bearing rollers, multi-point latch, and a workshop that runs the snag list itself.

Chapter 02 · How it works

Four parts.
Better than builder spec.

A 6063-T6 aluminium 27 × 65 frame

Architectural-grade aluminium, mitred corners, mechanically jointed and sealed at every joint. Powder-coated to any RAL — not the dusty silver every builder defaults to.

EPDM gasket, all the way around

A continuous EPDM gasket at the meeting stile, the head, the cill and the jamb. EPDM stays flexible through ten Mumbai monsoons. Vinyl, which the builders use, hardens in three.

SS 304 ball-bearing rollers, multi-point latch

Stainless rollers run smooth for 15+ years. Multi-point latch locks the panel at three positions on the meeting stile — the builder spec locks at one, which is why it slides out of position in year six.

—

No mild-steel rollers.
No vinyl gasket.
No single-point latch sliding out of position.

The parts that fail in a builder-spec window are simply not in this system. Same section, same opening, an order-of-magnitude better fabrication.

Domal sliding window meeting stile detail

Chapter 03 · Material

What it’s made of.
Down to the roller.

The 27 × 65 section is the standard. The fabrication isn’t. Every window we ship is built around the failure modes that actually happen in a Mumbai flat — roller seize, gasket hardening, latch drift — and engineered against each one.

Material 01

The frame — 6063-T6 aluminium.

Architectural-grade 6063-T6 aluminium, 27 × 65 mm section. Powder-coated to any RAL or NCS swatch. Anodised silver, champagne or black on request. Not the dusty mid-grey the builder defaults to.

Stainless steel roller hardware close-up

Material 02

The rollers — SS 304 ball-bearing.

Stainless ball-bearing rollers, double-wheel for panels over 1.4 m. Run smooth for 15+ years in Mumbai humidity. Mild-steel rollers — the market default — seize at year four when the bearing grease washes out in monsoon.

Material 03

The gasket — EPDM, not vinyl.

Continuous EPDM at every interface — meeting stile, head, cill, jamb. EPDM holds its compression for a decade through Mumbai’s humidity cycle. Vinyl hardens, cracks and lets monsoon in by year three.

Chapter 04 · Where it’s installed

Real flats.
Real society windows. Real monsoons.

Bedroom windows, kitchen windows, study and balcony enclosures. The everyday Mumbai window — replaced one room at a time as a society flat is refurbished, or fitted out across an entire flat in a renovation. Almost always the standard ask outside HNI master suites.

Bedroom · Andheri

The most common install.

A 2-track 27 × 65 slider replacing a leaking builder-spec window in a 25-year-old society flat. EPDM-sealed, SS 304 rollers, integrated mosquito-mesh track, powder-coated to match the existing window line.

Kitchen · Powai

3-track with mesh

Study window with sliding aluminium frame

Study · Worli

Single 1.8 m panel

Balcony enclosure with multi-panel sliding window

Balcony enclosure · Thane

Full 4-panel run

Walk-in closet window in black powder coat

Walk-in closet · Khar

Powder-coat black

Mumbai society building exterior with windows

Society refurb · Bandra

Whole-flat replacement

South Mumbai · Sea-facing

SS 316 rollers and a heavier EPDM gasket within 1 km of the coastline

Chapter 05 · Comparison

A direct read on the
seven decisions that matter.

Builder-spec domal

No-name market window

Aditi 27×65 Domal

Roller hardware

MS, seizes at yr 4

MS, seizes at yr 2

SS 304 ball-bearing, 15+ yr

Gasket

Vinyl, hardens at yr 3

Often none

EPDM, 10+ yr compression

Latch

Single-point, drifts

Single-point, slides out

Multi-point at 3 positions

Monsoon tightness

Leaks at meeting stile

Leaks at every joint

EPDM at every interface

Service life

8–10 yr

5–7 yr

12+ yr frame, 15+ yr rollers

Mosquito-mesh integration

Bolt-on aftermarket

Designed-in 3rd track

Finish

Dusty silver only

Mill finish

Powder coat, any RAL or NCS

Chapter 06 · Benefits

The standard window.
Specced like a designer would.

Better than builder spec.

Same section, same opening — an order-of-magnitude better fabrication. EPDM where builders use vinyl, SS 304 where they use mild-steel, multi-point latch where they use single-point.

12-yr frame life, realistically.

Architectural-grade 6063-T6 aluminium with a properly cured powder coat. The frame outlives most other things in the flat — the joinery, the white goods, the upholstery.

Monsoon-tight EPDM at every joint.

A continuous EPDM gasket at the meeting stile, head, cill and jamb. The window doesn’t leak in monsoon — and it doesn’t leak in year four either, when the vinyl on a builder window has hardened off.

SS 304 rollers for the long run.

Stainless ball-bearing rollers, double-wheel for panels over 1.4 m. Run smooth for 15+ years. The roller — not the frame — is the thing that fails first in a market window.

Available in 2 or 3 track.

2-track for a standard sliding pair; 3-track when the brief includes a permanent mosquito-mesh panel that runs on its own. The mesh integrates from day one — not as a bolt-on aftermarket frame.

Retrofits the old society opening.

Most Mumbai society flats have an out-of-square opening. We measure, fabricate to the as-built dimension, and shim cleanly — no plaster damage, no widened opening, no MEP impact.

Float or toughened glazing.

5 mm float for a standard bedroom window. 6 or 8 mm toughened where the window is below 800 mm sill height, or where a child or pet leans regularly. We’ll specify what the BIS code asks for.

Designer-spec powder coat.

Any RAL or NCS swatch. Anodised silver, champagne, black. The window can match the existing fenestration line on a society building, or step away from it cleanly in a renovation.

Designer-direct.

Suraj reads the drawing. No franchise, no call-centre, no rep filtering technical questions. The relationship is the brand.

Chapter 07 · Common questions

The questions a designer
asks before the quote.

Cost, mostly. The slim 16 × 45 series is roughly 50–70% more expensive than the 27 × 65 standard. For a master bedroom, a feature window or a sea-facing opening, the slim section earns its place. For a kitchen window, a study, a children’s bedroom or a society balcony enclosure, the 27 × 65 is the right call — and the upgrade is in the fabrication, not the section.

Not when the EPDM gasket is continuous and the cill drainage is correct. Both are easy to specify and easy to inspect — and both are routinely skipped on a builder-spec window. We wet-test on a sample run before whole-flat install when the client wants to see it for themselves.

Yes — almost always without disturbing the plaster. Mumbai society flats have out-of-square openings; we measure to the as-built dimension and shim cleanly. The original opening stays. The MEP and the painting around the window stay.

Two ways. A 3-track 27 × 65 has a dedicated third channel for a sliding mesh panel that runs alongside the glass — moves when the window moves. Or, where the budget is tighter, a retractable cassette mesh on the inside. Both are designed in from day one, not bolted on later.

12–16 working days from drawing approval to install for a typical 2 BHK whole-flat replacement. Single-window jobs can be faster. We work room-by-room when the family lives in the flat through the work.

Both, when done correctly. Anodised aluminium goes silver, champagne or black; powder-coat opens up the full RAL palette. We spec a 60-micron powder coat with a chromate pre-treatment — that’s the threshold above which Mumbai humidity does no real damage in a decade.

Pricing depends on opening size, glazing thickness, number of tracks and finish. Send the room-by-room dimensions and we’ll quote within two working days. Whole-flat enquiries are quoted as a single BOQ — usually clearer than per-square-foot rates.

Send the dimensions

Send the dimensions.
We’ll quote by Friday.

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.

For a whole-flat replacement, we’ll work the BOQ room-by-room and stage the install so the family can stay in the flat through the work — kitchen and bedroom windows on different days, never two openings open at once.

Phone

+91 98703 08481

surajgudhka@gmail.com

Web

www.aditienterprise.org

Workshop

Santacruz (East), Mumbai

aditi enterprise · Aluminium fabricators for Mumbai's interior designers, architects and HNI residences.