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Lower-maintenance external glass

Self-cleaning glass for exposed glazing

Describe the slope, rain exposure and required glazing build so suppliers can check whether a self-cleaning outer surface suits the project.

Product guide

Self-cleaning glass for exposed glazing

Describe the slope, rain exposure and required glazing build so suppliers can check whether a self-cleaning outer surface suits the project.

A modest garden-room glass roof after light rain.
AI-generated illustration. Appearance varies by specification; this is not an exact product sample.

Self-cleaning glass, coated roof glazing and low-maintenance glass

Self-cleaning glass uses a surface coating intended to assist the breakdown and washing away of some dirt. Daylight, rain exposure and the position of the glass matter. It remains a glazing product that needs a suitable installation and maintenance plan.

Roof panels, conservatory glazing and exposed windows can have very different slopes and shelter conditions. Describe nearby overhangs, the roof fall and access for maintenance. Sheltered or very low-slope glazing may need an alternative specification or cleaning approach.

Compatible sealants, gaskets and installation materials are important for coated glass. The supplier should identify the weather-facing coated surface and provide handling and care instructions. Self-cleaning is not a promise that the panel will never need cleaning.

Self-cleaning glass for exposed glazing for your project

Common enquiry briefs include conservatory roof, rooflight or lantern, external window, hard-to-reach glazing. Describe the intended use and the supporting construction so the supplier can assess the complete specification. Different applications can need different glass processing, fixings and installation details.

Check the exposure

A sheltered pane may not receive enough rain to rinse the surface. Flag overhangs and low roof slopes.

Keep the coating clear

Incompatible installation materials can mask the surface function. Follow the selected product’s handling guidance.

What to include in a made-to-measure quote

Compare quotes using the same dimensions, quantities, finish, glass construction and installation scope. If you have a drawing or an existing specification, include its reference and identify which details still need advice.

  • How will it be glazed?: The complete assembly determines the performance.
  • Slope from horizontal: Pilkington recommends at least 10° for Activ roof glazing; drainage and exposure still matter.
  • Rain exposure: Daylight and water are part of the cleaning mechanism.
  • Appearance / solar control: Confirm the exact combined product rather than assuming every coating can be mixed.

Cut-to-size dimensions, edges and fabrication

Measure the finished glass only when the fitting allowances and support details are known. Otherwise identify the opening or existing panel you measured and request a survey. Give each different size its own basket line, with its quantity and drawing reference.

Holes, cut-outs, shaped edges and interfaces with hardware should be settled before manufacture. The finished glass construction and any coatings must suit the intended environment. A screen preview or concept photograph cannot replace a sample, survey or product-specific installation drawing.

Supplier checks before manufacture

  • Self-cleaning is not maintenance-free and does not replace suitable drainage.
  • Installer must use compatible gaskets, sealants and cleaning methods.

Requesting comparable glass quotes

Save the choices you know and ask for help with the rest. The quote basket records a specification request rather than placing a manufacturing order. A firm quote needs an agreed final build, dimensions, delivery arrangements and any installation or design work.

When comparing proposals, check that glass-only supply and supply with fitting cover the same scope. Ask who provides measurement, drawings, supports, compatible hardware, lifting access and finishing work. Keep the final approved specification with the order.

Sources and further reading

Guided specification · Save multiple sizes · Supplier-confirmed quotes

Your glass, step by step

Build your specification

Choose what you know. Leave the rest for a supplier to advise. Add different sizes as separate basket lines.

No account needed to configure
1. Your project

1What are you making?

2. Glass and performance

2Choose the details

Examples and guidanceSelf-cleaning surface, exposure and drainage

The complete assembly determines the performance.

Outer surface and water exposureAn active exposed outer surface receives daylight and water; installation slope and rain access must be confirmed.How will it be glazed?Illustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Self-cleaning glass uses a functional outer surface that relies on appropriate daylight and water exposure. It still needs suitable installation, drainage and maintenance; sheltered glazing may receive insufficient rain.

State the roof slope, shading and overhangs. Confirm the compatible sealants, cleaning materials and manufacturer’s installation limits for the selected product and assembly.

Examples you may seeExposed roof glazing: describe slope and rain exposure.Sheltered installation: discuss access for cleaning rather than assuming a maintenance-free surface.Available choices: Help me choose; Single pane; Double-glazed unit; Triple-glazed unit; Secondary glazing.Current choice: Help me choose. This is your request for the supplier to confirm.Self-cleaning glass for exposed glazing: original Flow application conceptAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Pilkington: self-cleaning glass and installation (opens in a new tab) ↗

The complete assembly determines the performance.

Examples and guidanceSelf-cleaning surface, exposure and drainage

Pilkington recommends at least 10° for Activ roof glazing; drainage and exposure still matter.

Outer surface and water exposureAn active exposed outer surface receives daylight and water; installation slope and rain access must be confirmed.Slope from horizontalIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Self-cleaning glass uses a functional outer surface that relies on appropriate daylight and water exposure. It still needs suitable installation, drainage and maintenance; sheltered glazing may receive insufficient rain.

State the roof slope, shading and overhangs. Confirm the compatible sealants, cleaning materials and manufacturer’s installation limits for the selected product and assembly.

Examples you may seeExposed roof glazing: describe slope and rain exposure.Sheltered installation: discuss access for cleaning rather than assuming a maintenance-free surface.Available choices: Help me choose; Below 10 degrees; 10–29 degrees; 30 degrees or more; Vertical window.Current choice: Help me choose. This is your request for the supplier to confirm.Self-cleaning glass for exposed glazing: original Flow application conceptAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Pilkington: self-cleaning glass and installation (opens in a new tab) ↗

Pilkington recommends at least 10° for Activ roof glazing; drainage and exposure still matter.

Examples and guidanceSelf-cleaning surface, exposure and drainage

Daylight and water are part of the cleaning mechanism.

Outer surface and water exposureAn active exposed outer surface receives daylight and water; installation slope and rain access must be confirmed.Rain exposureIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Self-cleaning glass uses a functional outer surface that relies on appropriate daylight and water exposure. It still needs suitable installation, drainage and maintenance; sheltered glazing may receive insufficient rain.

State the roof slope, shading and overhangs. Confirm the compatible sealants, cleaning materials and manufacturer’s installation limits for the selected product and assembly.

Examples you may seeExposed roof glazing: describe slope and rain exposure.Sheltered installation: discuss access for cleaning rather than assuming a maintenance-free surface.Available choices: Help me choose; Open to daylight and rain; Partly sheltered by overhang; Sheltered from rain.Current choice: Help me choose. This is your request for the supplier to confirm.Self-cleaning glass for exposed glazing: original Flow application conceptAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Pilkington: self-cleaning glass and installation (opens in a new tab) ↗

Daylight and water are part of the cleaning mechanism.

Examples and guidanceSelf-cleaning surface, exposure and drainage

Confirm the exact combined product rather than assuming every coating can be mixed.

Outer surface and water exposureAn active exposed outer surface receives daylight and water; installation slope and rain access must be confirmed.Appearance / solar controlIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Self-cleaning glass uses a functional outer surface that relies on appropriate daylight and water exposure. It still needs suitable installation, drainage and maintenance; sheltered glazing may receive insufficient rain.

State the roof slope, shading and overhangs. Confirm the compatible sealants, cleaning materials and manufacturer’s installation limits for the selected product and assembly.

Examples you may seeExposed roof glazing: describe slope and rain exposure.Sheltered installation: discuss access for cleaning rather than assuming a maintenance-free surface.Available choices: Help me choose; Clear; Blue / tinted; Solar control and self-cleaning.Current choice: Help me choose. This is your request for the supplier to confirm.Self-cleaning glass for exposed glazing: original Flow application conceptAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Pilkington: self-cleaning glass and installation (opens in a new tab) ↗

Confirm the exact combined product rather than assuming every coating can be mixed.

3. Sizes and fabrication notes

3Size and quantity

Enter finished glass sizes. If you only have opening sizes, ask for a survey or fitting allowance before ordering.

Examples and guidancePanel outline and drawing

Choose the finished outline. A rectangle needs width and height; a circle needs diameter. Bespoke shapes need enough dimensions, radii and datum references to define the outline.

Panel dimension referenceFinished rectangular panel width and height. Opening dimensions are a different reference.ShapeIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

A preview is an illustration; ask the supplier to confirm the manufacturing drawing or template.

Examples you may seeRectangle or square: finished width and height.Circle: diameter, with hole or cut-out positions separately documented.Available choices: Rectangle; Circle; Shaped / drawing to follow.Self-cleaning glass for exposed glazing: original Flow application conceptAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗
Examples and guidanceMeasurement units

1 cm equals 10 mm. Choose the units before entering sizes; keep drawing annotations in the same units.

Panel dimension referenceFinished rectangular panel width and height. Opening dimensions are a different reference.Measurement unitsIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

The form converts entered measurements to the existing millimetre specification fields.

Examples you may see120 cm = 1,200 mm.60 cm = 600 mm.Available choices: Millimetres (mm); Centimetres (cm).Self-cleaning glass for exposed glazing: original Flow application conceptAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗
Examples and guidanceFinished panel dimensions

Record the finished width and height of each distinct panel. For a circle use its diameter; shaped work needs a dimensioned drawing or agreed template.

Panel dimension referenceFinished rectangular panel width and height. Opening dimensions are a different reference.Width ( mm )Illustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

An opening, frame and finished glass are different references. Request a survey when the finished manufacturing dimensions remain unknown.

Examples you may seeOne size per basket line; quantity records identical pieces.Check units and the dimension reference before confirming manufacture.Self-cleaning glass for exposed glazing: original Flow application conceptAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗
Examples and guidanceFinished panel dimensions

Record the finished width and height of each distinct panel. For a circle use its diameter; shaped work needs a dimensioned drawing or agreed template.

Panel dimension referenceFinished rectangular panel width and height. Opening dimensions are a different reference.Height ( mm )Illustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

An opening, frame and finished glass are different references. Request a survey when the finished manufacturing dimensions remain unknown.

Examples you may seeOne size per basket line; quantity records identical pieces.Check units and the dimension reference before confirming manufacture.Self-cleaning glass for exposed glazing: original Flow application conceptAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗
Examples and guidanceQuantity of identical pieces

Quantity counts pieces with the same size and specification. Enter different sizes or constructions as separate basket lines so each requirement is retained.

Numbered specification scheduleA numbered schedule separates panel specification, hardware, delivery, fitting and approvals.QuantityIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Examples you may seeThree identical panels: quantity 3.Two distinct sizes: separate lines.Self-cleaning glass for exposed glazing: original Flow application conceptAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗
Examples and guidanceDrawing references and unresolved details

Record drawing references, site conditions and requirements not captured in the choices. Identify anything that needs a survey or supplier confirmation before manufacture.

Numbered specification scheduleA numbered schedule separates panel specification, hardware, delivery, fitting and approvals.Project and fabrication notesIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Examples you may seeNumber drawings and panel positions consistently.State access constraints and the requested work scope.Self-cleaning glass for exposed glazing: original Flow application conceptAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗

0/2000 characters. Share drawings and photos in the job conversation after submitting.

Before you choose

The decisions that matter

01

Check the exposure

A sheltered pane may not receive enough rain to rinse the surface. Flag overhangs and low roof slopes.

02

Keep the coating clear

Incompatible installation materials can mask the surface function. Follow the selected product’s handling guidance.

Ready for a useful supplier quote

  • Self-cleaning is not maintenance-free and does not replace suitable drainage.
  • Installer must use compatible gaskets, sealants and cleaning methods.

Research behind these choices

Reviewed 23 October 2026. Manufacturer guidance and supplier ordering pages inform these design questions. Agree the final construction and project requirements with your supplier.

Reference performance data

Existing Pilkington Spectrum reference data for named builds. Values apply only to the listed construction; these rows are not results for your selection above. NPD means no declared value in this dataset.

Activ Clear — certified values per thickness

Activ Clear — certified values per thickness
Reference build / glassU / Ug (W/m²K)Light (%)g-value
Activ Clear · 3 mm5.8850.83
Activ Clear · 4 mm5.8850.82
Activ Clear · 6 mm5.7840.8
Activ Clear · 8 mm5.6830.78
Activ Clear · 10 mm5.6830.77

Useful questions

Can I get a quote before I know every detail?

Yes. Choose Help me choose where you need advice, or request a site measurement. Suppliers can review the brief; a firm manufacturing price needs an agreed final specification.

Does adding a panel place an order?

No. It saves a specification in your quote basket. Review the basket and provide your delivery details to request supplier quotes. Your configuration does not approve the product for installation.

What should I confirm for self-cleaning glass?

Self-cleaning is not maintenance-free and does not replace suitable drainage. Installer must use compatible gaskets, sealants and cleaning methods.

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