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25mm Polycarbonate Sheets - Heatguard and Bronze Opal

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25mm polycarbonate sheets are perfect for use in conservatories due to their strength and excellent insulation properties. Heatguard and Bronze-Opal 25mm polycarbonate sheets are very high quality and offer extra insulation properties. These dual tinted sheets help you to keep the heat in during colder months, and heat and glare out in the summer ones. With high impact resistance and built in UV protection to protect the sheet from sun damage these 25mm polycarbonate sheets from the Glazing Shop come with a 10 year Warranty.

Heatguard dual tinted polycarbonate has a special treatment that is built into the top side of the polycarbonate sheet. This silver-grey external face serves to reflect the suns rays helping to reduce heat build up within the roof by up to 50%.  The internal face of the polycarbonate sheet is opal tinted. This allows for excellent reflective internal light.

Bronze-Opal is a dual coloured polycarbonate sheet with a bronze outer surface and an opal tinted inner surface again giving excellent reflective inner light

TOTALLY FREE CUT TO SIZE SERVICE - no need to cut on site.

April Savings! -  get a 10% discount off all glazing bars through the whole of April when you buy your polycarbonate from us. Just use the discount code BAR10 at the checkout.

 Please choose your colour then input the length and width you require below :

Availability: In stock

25mm Dual-tinted Polycarbonate Sheets

25mm Heatguard and Bronze Opal Polycarbonate sheets have excellent insulation values and very high impact resistance. These amazing dual-tinted glazing sheets are manufactured from damage-resistant polycarbonate. We recommend the sheets have a maximum of 1050mm centres between supports. The external face of the sheets have a silver-grey or bronze appearance with a built in UV absorption layer. This outer layer is highly heat reflective, helping to reduce the incidence of hot spots to help keep the room cooler in the warmer months. The Opal inner layer reflects light back in the space. The Glazing shop 25mm polycarbonate sheets are of the highest quality. In line with this we offer a 10 year warranty for your peace of mind.

Main Benefits

       . Very high level of thermal insulation
       . Saves energy
       . Bounces light around with the Opal inner surface
       . Lighter weight than glass and much more easy to fit
    . Damage & impact resistant
    . Weatherable Longlife UV protection
    . Excellent fire performance - Class 1 surface spread of flame when tested to BS476 Part 7      


       . Conservatory roofs
       . Industrial Rooflights
       . Swimming Pool Room roofs 


Tints: Heatguard and Bronze Opal

Heat guard is a special treatment that is built into the top side of the polycarbonate sheet. This silver-grey outer layer serves to reflect the suns rays helping to reduce heat build up within the roof by up to 50%. The internal Opal face of the polycarbonate sheet gives excellent reflective internal light.

Bronze-Opal is a dual coloured polycarbonate sheet with a higly insulating bronze outer surface and an opal tinted inner surface to give excellent reflective inner light.

Glazing bars for 25mm multi-wall polycarbonate

25mm polycarbonate can be used with rafter supported and self-support glazing systems.

Rafter bars are screwed into supporting wooden rafters along their length. Self-supporting glazing bars do not need rafter support.

We have a wide range of rafter bars for 25mm polycarbonate sheets with PVC or aluminium capping. We supply these in a range of colours and lengths.

Our self-support glazing bars are also available in a wide range of lengths and colours. These and all the other profiles needed to build a self-supported lean to roof can be found in our self-support system area of the site.

Extra parts needed to build a 25mm polycarbonate roof?

Rafter supported roofs need rafter glazing bars with a choice of PVC capping or aluminium capping. Your roof will begin and end with glazing bars and you will have additional joiner bars between each sheet. With PVC capped bars you will add a 25mm universal edge trim to create your end bars and with aluminium capped bars you will need a 25mm aluminium F section. These trims will balance up the empty outside of the first and last bars where there is no glazing. They will also neatly cloak off the left and right edges of your roof. Finally, you will need 25mm sheet end closures to protect the bottom of the sheets from water penetration.

For a 25mm self support lean to roof you will first need glazing bars. You will use Self support end bars for the left and right hand sides of your roof, and self support main bars to join the sheets and support them.  A wallplate is used at the back, high end of the roof to fix the bars to. An eaves beam will be needed for the lower, front end of the roof. The gutter will be attached to this. You will need sheet end closures to enclose the bottom ends of the polycarbonate sheets and keep out moisture. These go on top of the anti-dust tape. If you will be cutting your polycarbonate sheets down on site you will need anti-dust tape to retape them.


For extra information about all of the thicknesses of structured polycarbonate, their colours, applications and prices, or to place an order have a look at the polycarbonate sheets pages. Alternatively have a read through our Polycarbonate Buyers guide.

Should you have any questions or need any help at all please call us on 01536 446395 and we will be very happy to help you.

25mm Dual tint Polycarbonate Technical Information Summary

25mm Polycarbonate Sheet Thickness
  Heatguard Bronze Opal
U-Value 1.4 1.4
Light Transmission 7% 8%
Weight (kg per sqm) 3.1 3.1


Sheet Structure:

25mm multi-wall in an ‘X’ structure.


BS476/7: Class 1

UV Protection:

UV Protection: Yes co-extruded on the top of the sheet. The sheet must be installed the right way up. The bronze side of the bronze-opal sheet faces the sky; the silver-grey side of the heatguard sheet faces the sky.

Cutting Tolerance:

Length & Width: +/-5mm


10 year manufacturer's limited warranty


Additional Manufacturers Technical information 

Please open or download the following pdf

Marlon 25mm Clear Bronze Specification sheet X wall  

Frequently Asked questions

What is 25mm ‘dual tinted’ polycarbonate?

A dual tint on a polycarbonate sheet means that the sheet has two layers within it’s make up. The top layer offers extra thermal insulation reflecting the sun’s rays to prevent heat build-up. The lower layer is opal to help bounce light around under the roof.

What is 25mm ‘multi wall’ polycarbonate?

Structure of 25mm heatguard polycarbonate

Multi-wall polycarbonate refers to the sheet structure which is made up of walls and cavities otherwise known as flutes. 25mm polycarbonate is known as an ‘X’ structure due to the appearance of the walls within the sheet.

This structure makes it light weight and easy to handle compared to glass. It also insulates the sheet making it a smart choice for conservatory roofs.

Which are the length and width of a multiwall polycarbonate sheet?

Length and width of 25mm heatguard polcarbonate sheets

The length follows the lines down the flutes of the sheet and the width is across them. The maximum sheet length is 7m and the maximum width is 2.1m. We cut your sheets to the size you need at no extra cost, saving you time and inconvenience on site.

Is there a correct way up for 25mm dual tint polycarbonate sheets?

The bronze or silver-grey surface of the sheet has a co-extruded UV protective layer. The sheet must be placed with this at the top and the opal layer underneath.

Do 25mm polycarbonate sheets need to be taped?

Yes, the open ends of all externally placed 25mm sheets need to be taped to prevent dust and insects getting into the flutes. We supply all our 25mm sheets taped for you at no extra cost. If you cut them down again on site, you will need to buy 25mm anti dust tape to retape the bottom of the sheets.

What colour of 25mm polycarbonate sheet should I choose?

25mm polycarbonate is available in clear, opal and bronze tints. It is also available in dual tints of Heatguard Opal and Bronze Opal.

25mm heatguard polycarbonate is a dual tinted sheet with a silver-grey upper surface and an opal lower one. Perfect for conservatories where thermal insulation is important, the heatguard surface reflects the sun’s rays to reduce heat build-up by up to 50%. It also helps to keep the heat in on colder days. Light transmission is 8% however, the opal inner surface helps to bounce light around keeping the room lighter.

25mm Bronze-Opal polycarbonate is a dual-coloured polycarbonate sheet with a bronze upper surface and an opal tinted lower one. The bronze surface reflects the sun’s rays offering good thermal insulation. With a light transmission of 7%, the opal inner surface adds reflective inner light.

25mm clear polycarbonate has 62% light transmission allowing plenty of light to shine through. Clear polycarbonate will allow a diffused view of the sky but will show dirt on the roof more clearly than other tints.

25mm opal polycarbonate has a translucent white look quite like that of an opal light bulb. With a light transmission of 20% it allows a softer light through it. The translucency offers excellent privacy from above. It is excellent if you have a canopy that will be overlooked, and you wish to obscure the view. This opacity also helps to mask the appearance from below of any leaves or debris that might form.

25mm bronze polycarbonate has a brown / bronze tint. Often used with brown glazing bars and accessories to match brown windows or conservatories. With a light transmission of 15% bronze polycarbonate will give the most shade of the three single tint colours.

What projects is 25mm heatguard or bronze-opal polycarbonate suitable for?

25mm heatguard and bronzeopal polycarbonate sheets are particularly suited to conservatory roofs. They have better thermal insulation properties due both to their structure and the dual tinted colours of the sheet.

The maximum recommended unsupported span is around 1000mm on a rafter supported roof. On a self-supported roof you need to be guided by the bar structural abilities so this may be reduced. The 25mm polycarbonate sheets from the Glazing shop are excellent value - does that make them lower quality?

The 25mm dual tinted polycarbonate sheets from the Glazing shop are excellent value - does that mean the quality of them is lower than others on the market?

Our 25mm polycarbonate dual tint sheets are from the highest quality extruders. We have been supplying sheets for many years and the amount that we sell allows us to buy economically – we pass theses savings on to our customers. 

Is there a warranty with 25mm polycarbonate from the Glazing shop?

All the polycarbonate sheets from the Glazing shop have a 10-year limited manufacturer’s warranty giving you peace of mind.


If you have any other queries that aren't answered here, please give us a call on 01536 446395 and we will be happy to help you.