Aluminium windows for coastal homes in Goa and Karnataka
Salt, humidity and monsoon rain call for decisions on finish, hardware and drainage. What to write into the quote for a home near the coast, and what we confirm with AluK.
Salt aerosols settle on frames and hardware and, in humid air, form a damp film that can pit weak finishes and seize poor hardware. In Goa that air travels well inland along estuaries and creeks, not just on the beachfront. In the monsoon, rain arrives sideways as well as down.
Aluminium does not rust like steel, and AluK says its finishes are built for tropical weather. What matters is the finish class, the hardware, the drainage and the cleaning routine. This page is the commercial, specification-side answer. The Goa climate guide explains the science and the materials debate.
The coastal specification checklist
A good coastal quotation lists every item below in writing. If your quote leaves one blank, ask why. AluK offers customised finishes for aggressive environments on request across its sliding and casement series, which is the right starting point.
We do not claim a finish class that AluK has not published. We ask for the certificate for your colour.
Finish class and pre-treatment, with the certificate for your colour
A 67 mm thermally broken series for high thermal and acoustic performance, with burglary class RC2. AluK recommends it for replacing old wooden and PVC windows.
Estuaries, wind direction, orientation and tree cover change exposure. A house on an estuary bank can sit in more salt-laden air than one closer to the open sea but behind a ridge. We ask about your exact plot.
Finish first, then colour
Qualicoat classes map to AAMA 2603, 2604 and 2605 tiers, so powder coat durability differs. Ask for the class and the certificate for the colour you want. The class AluK’s palette holds is not stated on its page.
Drainage and sill
Sliding doors rely on weep holes. Keep them clear and check that the floor finish does not block them.
Maintenance as a routine
Powder-coat suppliers give cleaning intervals from roughly three to six months on a high-salt coast to 12 to 18 months on a low-salt one. Rinse with fresh water and mild detergent. We give care instructions at handover.
HOW TO DECIDE
System and glass choices near the sea
A casement window presses into its frame under wind and driven rain, which suits exposed faces. A lift and slide door lowers onto seals when closed, which helps on an open sea-facing terrace. A standard sliding door is fine where the door is sheltered under a verandah.
If another material is being considered, our aluminium versus uPVC guide sets out when each fits. Rules of thumb:
Sea-facing terrace, no overhang: lift and slide or casement, with drainage drawn
Sheltered verandah: standard sliding is usually enough
West-facing living room: choose low solar-gain glass first
Holiday home empty for months: ask for a lock-up routine and rinse before leaving
Rooms with salt exposure on hardware: confirm stainless fittings in writing
Three coastal questions to put in writing
What finish and what certificate
Ask which class and which certificate cover your exact colour, not the palette in general.
What happens at the sill
Ask for the drainage detail on a drawing. Where does water go, and what blocks it.
What is the warranty and what voids it
Ask whether cleaning frequency affects cover, who services, and whether cover transfers.
Coastal project sequence
Tell us the plot
Location, distance from sea, orientation and any shading.
Review exposure
We suggest finish, hardware and glass priorities.
Operate and compare
Sample systems at Tilakwadi, then confirm finishes.
Site measurement and drawings
Including drainage details.
Install and care
Installation and written cleaning instructions. Outside Belagavi, arranged per project; confirm coverage.
Suppliers’ guidance ranges from every few months on a high-salt coast to every 12 to 18 months on a low-salt coast. Ask for instructions for your finish.
Coastal zone and heritage rules vary by plot. Check with the relevant authority before you start.
What a coastal quotation should state
A quote that says only ‘powder-coated aluminium sliding windows’ tells you nothing about the finish, the fasteners or the drainage. A quotation you can rely on names the system, the version, the finish class and certificate, the hardware material, the glass build-up and the drainage detail.
It also states what is not covered. If the supplier will not write the finish class on the quotation, treat that as information. We write what AluK has published, and where AluK has not published a figure, such as the class its palette holds, we say so and ask AluK for the certificate for your colour. Keep the comparison like for like: same series, same glass, same hardware, same finish.
A cleaning and inspection routine you can keep
Rinse frames with fresh water and mild detergent, never abrasive pads. Clear track channels and weep holes before the monsoon and after any dusty spell. Check seals and handle screws once a year, and wipe a little light machine oil on locks and hinges, as AluK’s care guidance suggests, without leaving excess.
Confirm the schedule for your own finish with your supplier, since the UK guidance AluK publishes is general and a coastal home needs shorter intervals. Put the routine on a card near the fuse box, so it survives a change of caretaker.
