A Look At The Ugly Real Truth Of Secondary Glazing Plastic Options

A Look At The Ugly Real Truth Of Secondary Glazing Plastic Options

Secondary Glazing Plastic Options: A Comprehensive Guide to Improving Insulation

In an era where energy effectiveness and rising utility costs are at the forefront of property owners' issues, finding ways to insulate residential or commercial properties effectively has actually become a top priority. While replacing whole window units with double or triple glazing is a typical option, it can be excessively pricey and is often not allowed in listed structures or sanctuary. This is where secondary glazing functions as a useful, cost-effective option.

Secondary glazing involves setting up an extra pane of glass or plastic inside an existing window. While glass was as soon as the standard product, improvements in polymers have made plastic options significantly popular. This guide checks out the numerous secondary glazing plastic options, their advantages, and how they compare to one another.


Why Choose Plastic Over Glass?

Before diving into particular materials, it is vital to understand why a property owner or center supervisor may select plastic rather of conventional glass for secondary glazing.

  1. Lightweight Nature: Plastic sheets are considerably lighter than glass. This makes them easier to manage throughout DIY setups and places less strain on existing window frames.
  2. Safety and Impact Resistance: Many plastic choices are essentially solid. In families with kids or in locations susceptible to high winds, the unbreakable nature of plastics like polycarbonate supplies peace of mind.
  3. Thermal Insulation: Plastics are naturally better insulators than glass. They have lower thermal conductivity, suggesting they are more reliable at preventing heat from getting away through the window.
  4. Relieve of Customization: Unlike glass, which requires professional cutting and toughening, plastic sheets can often be cut to size utilizing basic workshop tools.

Key Plastic Materials for Secondary Glazing

There are 3 main types of plastic used for secondary glazing: Acrylic, Polycarbonate, and PETG. Each has unique attributes that make it ideal for various environments.

1. Acrylic (frequently called Perspex or Plexiglass)

Acrylic is perhaps the most common plastic utilized for secondary glazing. It is treasured for its extraordinary clarity and aesthetic resemblance to glass.

  • Clarity: Acrylic is clearer than glass, enabling more light to go through.
  • UV Resistance: It is naturally resistant to UV light, implying it will not yellow or end up being fragile when exposed to direct sunshine over many years.
  • Weight: It is approximately 50% lighter than a glass pane of the same thickness.
  • Restriction: It is more breakable than polycarbonate and can crack if misused or drilled incorrectly.

2. Polycarbonate (typically referred to as Lexan)

Polycarbonate is the "durable" option of the plastic world. It is often used in high-security environments or where extreme durability is needed.

  • Strength: Polycarbonate is approximately 250 times stronger than glass and is practically solid.
  • Fire Rating: It has exceptional fire-resistant residential or commercial properties, often bring a Class 1 fire ranking.
  • Flexibility: It is more versatile than acrylic, making it simpler to suit a little irregular frames.
  • Limitation: It is more prone to scratching than acrylic and is normally more expensive.

3. PETG (Polyethylene Terephthalate Glycol)

PETG is a thermoplastic that sits in between acrylic and polycarbonate in terms of performance.

  • Relieve of Use: It is extremely easy to produce and does not need customized drill bits.
  • Food Safe: While not constantly pertinent for glazing, its chemical resistance makes it long lasting versus harsh cleaning agents.
  • Restriction: It does not have the exact same level of UV stability as acrylic, making it more fit for windows that do not receive continuous, direct sunlight.

Comparative Analysis of Plastic Materials

The following table supplies a quick referral to help determine which product is finest fit for specific secondary glazing requirements.

FeatureAcrylic (Perspex)PolycarbonatePETG
Effect ResistanceModerateExtreme (Unbreakable)High
Optical ClarityExcellent (Better than glass)GoodGreat
UV ResistanceOutstandingVaries (Requires covering)Moderate
Scratch ResistanceModerateLowModerate
WeightLight-weightLight-weightLightweight
Relieve of DIY CuttingModerate (can chip)EasyEasy
Typical Use CaseLiving rooms, BedroomsSecurity, Schools, ShedsWorkshops, Inner spaces

Setup Methods for Plastic Secondary Glazing

The efficiency of secondary glazing depends heavily on the installation approach used. Since plastic is lightweight, numerous non-permanent choices are offered.

Magnetic Strip Systems

This is the most popular DIY technique. 2 magnetic strips are utilized: one is followed the window frame and the other to the perimeter of the plastic sheet.

  • Pros: Easy to eliminate for cleaning or throughout the summer season months.
  • Cons: Not as airtight as fixed systems; magnets can lose strength over several years.

Clip and U-Channel Systems

This involves screwing little plastic clips or a "U-channel" track around the window frame. The plastic sheet is then slotted into place or held by the clips.

  • Pros: Provides a more protected hold than magnets.
  • Cons: Requires drilling into the window frame or surround.

Screw-on Fixed Systems

For maximum insulation and draught proofing, the plastic sheet can be screwed straight to the frame using color-coded washers and screws.

  • Pros: The most airtight and permanent solution.
  • Cons: Difficult to eliminate; requires visible holes in the window frame.

Maintenance and Care

To ensure the longevity of plastic secondary glazing, particular maintenance procedures should be followed. Unlike glass, plastics are sensitive to specific chemicals.

  • Cleaning: Never utilize glass cleaners containing ammonia or alcohol (like Windex), as these can "craze" (develop tiny cracks) or cloud the plastic. Rather, use lukewarm water with a mild meal soap and a soft microfiber cloth.
  • Static Reduction: Plastics can bring in dust due to static electrical energy. Using specialized anti-static cleaners can assist keep the panels clear for longer.
  • Scratch Prevention: When cleaning, avoid circular movements.  Windows And Doors R Us , horizontal or vertical strokes to lessen the presence of any small abrasions that may happen.

The Benefits of Plastic Glazing: At a Glance

  • Noise Reduction: Creates an acoustic barrier that can lower external sound by approximately 50-70%.
  • Condensation Control: By producing a thermal break, it prevents warm air from striking cold glass, significantly decreasing interior condensation.
  • Cost Savings: Lower preliminary material expense and reduced heating bills cause a high roi.
  • Preservation: Ideal for historic homes where original windows need to be protected.

Regularly Asked Questions (FAQ)

Does plastic secondary glazing yellow with time?

If high-quality Acrylic (Perspex) is used, it will not yellow for a minimum of 10-- 20 years. Requirement Polycarbonate might yellow if it does not have a UV-resistant finishing, so it is necessary to acquire "UV-stabilized" sheets for south-facing windows.

What density should I select for the plastic?

For a lot of domestic windows, a density of 2mm to 4mm is sufficient. 2mm is extremely light however might "bow" in bigger windows; 3mm or 4mm provides more rigidness and better sound insulation.

Can I still open my windows?

If a magnetic or clip-on system is utilized, the panel can be gotten rid of quickly to enable ventilation. If long-term ventilation is needed, "moving" secondary glazing systems are readily available, though these generally require an expert installer.

Will plastic glazing stop all condensation?

While it significantly decreases condensation by keeping the inner surface warmer, it might not eliminate it entirely if there are existing moisture problems in the space or if the seal on the secondary glazing is not airtight.

Can I cut the plastic myself?

Yes, a lot of plastics can be cut with a fine-toothed saw or a jigsaw. Acrylic can also be "scored and snapped," though this needs practice to prevent rugged edges.


Secondary glazing utilizing plastic alternatives uses a versatile, efficient, and budget-friendly method to enhance the thermal and acoustic performance of a structure. Whether selecting the crystal-clear finish of Acrylic or the unbreakable nature of Polycarbonate, homeowners can enjoy a warmer, quieter environment without the disruption and expenditure of complete window replacement. By selecting the ideal product and setup method, it is possible to achieve professional-grade insulation results through basic DIY enhancements.