15 Of The Most Popular Secondary Glazing Plastic Options Bloggers You Need To Follow

15 Of The Most Popular Secondary Glazing Plastic Options Bloggers You Need To Follow

Secondary Glazing Plastic Options: A Comprehensive Guide to Improving Insulation

In an era where energy performance and increasing utility costs are at the leading edge of property owners' issues, finding methods to insulate properties effectively has actually become a top priority. While changing whole window units with double or triple glazing is a typical service, it can be excessively pricey and is typically not permitted in listed buildings or sanctuary. This is where secondary glazing serves as a useful, economical option.

Secondary glazing involves setting up a supplemental pane of glass or plastic inside an existing window. While glass was as soon as the standard material, developments in polymers have made plastic alternatives significantly popular. This guide explores the various secondary glazing plastic choices, their benefits, and how they compare to one another.


Why Choose Plastic Over Glass?

Before diving into particular products, it is necessary to understand why a property owner or center manager might select plastic instead of conventional glass for secondary glazing.

  1. Lightweight Nature: Plastic sheets are significantly lighter than glass. This makes them much easier to handle during DIY setups and places less pressure on existing window frames.
  2. Security and Impact Resistance: Many plastic choices are essentially unbreakable. In households with kids or in locations susceptible to high winds, the unbreakable nature of plastics like polycarbonate supplies assurance.
  3. Thermal Insulation: Plastics are naturally better insulators than glass. They have lower thermal conductivity, indicating they are more effective at preventing heat from escaping through the window.
  4. Alleviate of Customization: Unlike glass, which requires professional cutting and toughening, plastic sheets can often be cut to size using standard workshop tools.

Secret Plastic Materials for Secondary Glazing

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

1. Acrylic (typically called Perspex or Plexiglass)

Acrylic is perhaps the most typical plastic utilized for secondary glazing. It is valued for its extraordinary clearness and visual similarity to glass.

  • Clarity: Acrylic is clearer than glass, allowing more light to travel through.
  • UV Resistance: It is naturally resistant to UV light, suggesting it will not yellow or become fragile when exposed to direct sunshine over many years.
  • Weight: It is around 50% lighter than a glass pane of the exact same thickness.
  • Restriction: It is more fragile than polycarbonate and can break if mistreated or drilled improperly.

2. Polycarbonate (typically known as Lexan)

Polycarbonate is the "heavy-duty" alternative of the plastic world. It is frequently used in high-security environments or where severe toughness is required.

  • Strength: Polycarbonate is approximately 250 times more powerful than glass and is practically unbreakable.
  • Fire Rating: It has outstanding fire-resistant homes, often carrying a Class 1 fire ranking.
  • Versatility: It is more flexible than acrylic, making it easier to suit slightly irregular frames.
  • Constraint: It is more prone to scratching than acrylic and is normally more expensive.

3. PETG (Polyethylene Terephthalate Glycol)

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

  • Reduce of Use: It is very easy to fabricate and does not require customized drill bits.
  • Food Safe: While not constantly relevant for glazing, its chemical resistance makes it durable against severe cleansing agents.
  • Constraint: It does not have the very same level of UV stability as acrylic, making it more suited for windows that do not receive continuous, direct sunlight.

Comparative Analysis of Plastic Materials

The following table offers a fast reference to assist determine which material is best matched for specific secondary glazing requirements.

FeatureAcrylic (Perspex)PolycarbonatePETG
Impact ResistanceModerateSevere (Unbreakable)High
Optical ClarityOutstanding (Better than glass)GoodGreat
UV ResistanceExceptionalVaries (Requires coating)Moderate
Scratch ResistanceModerateLowModerate
WeightLight-weightLightweightLight-weight
Ease of DIY CuttingModerate (can chip)EasyEasy
Typical Use CaseLiving rooms, BedroomsSecurity, Schools, ShedsWorkshops, Inner rooms

Installation Methods for Plastic Secondary Glazing

The effectiveness of secondary glazing depends heavily on the setup method used. Because plastic is lightweight, several non-permanent alternatives are offered.

Magnetic Strip Systems

This is the most popular DIY method. 2 magnetic strips are used: one is complied with the window frame and the other to the border of the plastic sheet.

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

Clip and U-Channel Systems

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

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

Screw-on Fixed Systems

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

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

Maintenance and Care

To make sure the durability of plastic secondary glazing, particular upkeep protocols need to be followed. Unlike glass, plastics are delicate to specific chemicals.

  • Cleansing: Never use glass cleaners containing ammonia or alcohol (like Windex), as these can "trend" (develop tiny fractures) or cloud the plastic. Rather, use  secondary glazing installer in lymington  with a mild dish soap and a soft microfiber fabric.
  • Fixed Reduction: Plastics can bring in dust due to static electrical power. Using specific anti-static cleaners can help keep the panels clear for longer.
  • Scratch Prevention: When cleaning, prevent circular motions. Use long, horizontal or vertical strokes to minimize the exposure of any minor abrasions that might occur.

The Benefits of Plastic Glazing: At a Glance

  • Noise Reduction: Creates an acoustic barrier that can lower external sound by as much as 50-70%.
  • Condensation Control: By developing a thermal break, it prevents warm air from striking cold glass, significantly decreasing interior condensation.
  • Expense Savings: Lower preliminary material cost and lowered heating expenses result in a high roi.
  • Preservation: Ideal for historic homes where initial windows should be preserved.

Regularly Asked Questions (FAQ)

Does plastic secondary glazing yellow with time?

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

What thickness should I select for the plastic?

For the majority of domestic windows, a density of 2mm to 4mm suffices. 2mm is extremely light however may "bow" in bigger windows; 3mm or 4mm provides more rigidity 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 rapidly to permit ventilation. If long-term ventilation is required, "moving" secondary glazing systems are available, though these usually require a professional installer.

Will plastic glazing stop all condensation?

While it substantially lowers condensation by keeping the inner surface warmer, it may not remove it completely if there are existing moisture concerns in the room or if the seal on the secondary glazing is not airtight.

Can I cut the plastic myself?

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


Secondary glazing utilizing plastic alternatives offers a versatile, effective, and economical way to enhance the thermal and acoustic efficiency of a building. Whether picking the crystal-clear surface of Acrylic or the indestructible nature of Polycarbonate, property owners can delight in a warmer, quieter environment without the disturbance and expenditure of full window replacement. By choosing the ideal material and installation technique, it is possible to attain professional-grade insulation results through easy DIY enhancements.