Protective Coatings for Glass

Protective coatings for glass can make glazing easier to clean by reducing how strongly dirt and contaminants adhere to its surface. Often described as low maintenance glass coatings, these treatments can reduce cleaning effort and help protect against staining.

They are particularly useful where glazing is difficult to reach or exposed to demanding conditions. However, low maintenance does not mean maintenance free. The coating, installation and surrounding environment all affect the cleaning required.

How do low maintenance glass coatings work?

Protective surface treatments create a barrier between the glass and contaminants. A polymeric resin treatment, for example, bonds with the glass to create an easy-clean surface, making deposits easier to remove during maintenance.

Some treatments are hydrophobic, meaning they repel water. This differs from photocatalytic self-cleaning glass, which uses daylight and water to help remove organic dirt.

Is low maintenance glass the same as self-cleaning glass?

These terms should not be used interchangeably without explaining the technology.

Easy-clean protective treatments reduce the adhesion of contaminants and make manual cleaning easier. Their performance does not necessarily depend on sunlight activating the surface.

Photocatalytic self-cleaning glass uses daylight to break down organic dirt. Its hydrophilic surface encourages rainwater to spread across the glass and wash loosened deposits away.

Neither approach removes every cleaning requirement. For example, the photocatalytic action does not break down inorganic deposits such as salt. Manual cleaning may also be needed during dry weather or where rainfall does not reach the glass.

Where are protective glass coatings useful?

Low maintenance coatings can be considered for:

• Rooflights and structural glass roofs, where external cleaning can be difficult.

• High-level windows and large glazed elevations, where access affects maintenance arrangements.

• Coastal glazing, where salt and other airborne deposits increase cleaning requirements.

• Swimming pool glazing, where moisture and chemical deposits can affect exposed surfaces.

The appropriate treatment should be selected for the glass, exposure and intended use.

What maintenance can these coatings reduce?

Depending on the product and installation, protective coatings can make deposits easier to remove, reduce cleaning time and help limit staining or etching. Some treatments can also reduce how frequently the glass needs cleaning.

They do not eliminate dirt, guarantee a permanently spotless surface or replace regular maintenance. Mineral deposits and other contamination can still accumulate on treated glass.

A glass surface treatment also does not remove the need to clean frames, maintain seals or keep drainage channels clear. Safe access for inspection and cleaning should remain part of the glazing design.

What should be considered for rooflights?

Roof pitch and drainage influence how water and deposits move across roof glazing. Coated glass should not be assumed to compensate for standing water or inadequate drainage.

The suitability of a treatment must be checked against its manufacturer’s guidance and the proposed glazing installation. Pitch recommendations for one product should not be applied automatically to every low maintenance or self-cleaning coating.

Can protective treatments be applied to existing glazing?

Some protective treatments can be applied to existing glass as well as new installations. The glass must first be assessed and prepared; existing contamination may require specialist cleaning or restoration before treatment.

Application methods, durability and aftercare requirements vary between products.

How should treated glass be cleaned?

Follow the instructions supplied for the particular treatment. Use approved cleaning products and equipment, and avoid abrasive methods that could damage the surface.

Cleaning frequency should reflect the location and exposure. Coastal deposits and hard-water residues may require more frequent attention, even where a protective treatment has been applied.

Low maintenance coatings serve a different purpose from solar-control and low-emissivity coatings. Thermal performance and solar control should be specified separately within the overall glass build-up.

Contact IQ Glass to discuss protective coatings and maintenance considerations for your glazing project.