The Reason You Shouldn't Think About Improving Your Secondary Glazing Plastic Options

· 5 min read
The Reason You Shouldn't Think About Improving Your Secondary Glazing Plastic Options

Secondary Glazing Plastic Options: A Comprehensive Guide to Improving Insulation

In a period where energy effectiveness and rising energy costs are at the leading edge of property owners' issues, finding ways to insulate homes efficiently has actually become a priority. While replacing entire window systems with double or triple glazing is a typical option, it can be excessively expensive and is typically not allowed in listed structures or conservation locations.  website  is where secondary glazing serves as a practical, cost-efficient option.

Secondary glazing involves setting up a supplemental pane of glass or plastic inside an existing window. While glass was when the basic material, advancements in polymers have actually made plastic alternatives progressively popular. This guide explores the numerous secondary glazing plastic options, 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 supervisor may go with plastic instead of standard glass for secondary glazing.

  1. Light-weight Nature: Plastic sheets are significantly lighter than glass. This makes them simpler to handle throughout DIY setups and places less stress on existing window frames.
  2. Security and Impact Resistance: Many plastic alternatives are virtually solid. In households with children or in locations vulnerable to high winds, the shatterproof nature of plastics like polycarbonate provides 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 leaving through the window.
  4. Reduce of Customization: Unlike glass, which needs expert cutting and toughening, plastic sheets can often be cut to size using fundamental workshop tools.

Key Plastic Materials for Secondary Glazing

There are 3 main kinds of plastic utilized for secondary glazing: Acrylic, Polycarbonate, and PETG. Each has special attributes that make it suitable for various environments.

1. Acrylic (typically known as Perspex or Plexiglass)

Acrylic is possibly the most typical plastic used for secondary glazing. It is prized for its extraordinary clarity and visual similarity to glass.

  • Clearness: Acrylic is clearer than glass, enabling 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 several years.
  • Weight: It is approximately 50% lighter than a glass pane of the same density.
  • Limitation: It is more breakable than polycarbonate and can break if handled approximately or drilled incorrectly.

2. Polycarbonate (typically referred to as Lexan)

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

  • Strength: Polycarbonate is roughly 250 times more powerful than glass and is practically solid.
  • Fire Rating: It has outstanding fireproof homes, typically carrying a Class 1 fire ranking.
  • Flexibility: It is more flexible than acrylic, making it much easier to fit into slightly uneven frames.
  • Restriction: It is more prone to scratching than acrylic and is usually more costly.

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 simple to fabricate and does not need customized drill bits.
  • Food Safe: While not constantly pertinent for glazing, its chemical resistance makes it resilient versus harsh cleaning agents.
  • Restriction: It does not have the very same level of UV stability as acrylic, making it more suited for windows that do not receive constant, direct sunlight.

Relative Analysis of Plastic Materials

The following table offers a fast referral to assist determine which product is best fit for specific secondary glazing needs.

FunctionAcrylic (Perspex)PolycarbonatePETG
Effect ResistanceModerateSevere (Unbreakable)High
Optical ClarityExcellent (Better than glass)GoodGood
UV ResistanceOutstandingVaries (Requires finish)Moderate
Scratch ResistanceModerateLowModerate
WeightLightweightLightweightLightweight
Reduce of DIY CuttingModerate (can chip)EasyEasy
Normal Use CaseLiving spaces, BedroomsSecurity, Schools, ShedsWorkshops, Inner rooms

Installation Methods for Plastic Secondary Glazing

The efficiency of secondary glazing depends heavily on the setup method used. Because plastic is light-weight, numerous non-permanent options are readily available.

Magnetic Strip Systems

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

  • Pros: Easy to get rid of for cleansing or during the summertime.
  • Cons: Not as airtight as fixed systems; magnets can lose strength over numerous years.

Clip and U-Channel Systems

This includes screwing small 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 utilizing color-coded washers and screws.

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

Upkeep and Care

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

  • Cleansing: Never use glass cleaners containing ammonia or alcohol (like Windex), as these can "fad" (create small fractures) or cloud the plastic. Instead, use lukewarm water with a moderate meal soap and a soft microfiber cloth.
  • Fixed Reduction: Plastics can draw in dust due to fixed electrical energy. Using specialized anti-static cleaners can help keep the panels clear for longer.
  • Scratch Prevention: When cleansing, avoid circular movements. Use long, horizontal or vertical strokes to reduce the visibility of any minor abrasions that might occur.

The Benefits of Plastic Glazing: At a Glance

  • Sound Reduction: Creates an acoustic barrier that can reduce external sound by approximately 50-70%.
  • Condensation Control: By creating a thermal break, it prevents warm air from hitting cold glass, considerably minimizing interior condensation.
  • Expense Savings: Lower initial material expense and lowered heating expenses result in a high roi.
  • Conservation: Ideal for historical homes where initial windows must be preserved.

Often Asked Questions (FAQ)

Does plastic secondary glazing yellow with time?

If premium Acrylic (Perspex) is utilized, it will not yellow for at least 10-- 20 years. Standard Polycarbonate might yellow if it does not have a UV-resistant finishing, so it is very important to purchase "UV-stabilized" sheets for south-facing windows.

What density should I select for the plastic?

For the majority of domestic windows, a thickness of 2mm to 4mm suffices. 2mm is extremely light however may "bow" in larger windows; 3mm or 4mm offers more rigidity and better sound insulation.

Can I still open my windows?

If a magnetic or clip-on system is used, the panel can be gotten rid of rapidly to permit ventilation. If permanent ventilation is needed, "moving" secondary glazing systems are offered, though these typically require a professional installer.

Will plastic glazing stop all condensation?

While it considerably minimizes condensation by keeping the inner surface area warmer, it might not remove it totally if there are existing dampness concerns in the room or if the seal on the secondary glazing is not airtight.

Can I cut the plastic myself?

Yes, many plastics can be cut with a fine-toothed saw or a jigsaw. Acrylic can also be "scored and snapped," though this needs practice to avoid jagged edges.


Secondary glazing utilizing plastic alternatives uses a flexible, efficient, and economical way to improve the thermal and acoustic efficiency of a structure. Whether choosing the crystal-clear finish of Acrylic or the indestructible nature of Polycarbonate, homeowners can enjoy a warmer, quieter environment without the interruption and expenditure of full window replacement. By choosing the right product and setup method, it is possible to accomplish professional-grade insulation results through basic DIY improvements.