7 Simple Changes That Will Make A Big Difference With Your Secondary Glazing Plastic Options

· 5 min read
7 Simple Changes That Will Make A Big Difference With Your Secondary Glazing Plastic Options

Secondary Glazing Plastic Options: A Comprehensive Guide to Improving Insulation

In an era where energy efficiency and increasing utility expenses are at the forefront of house owners' concerns, finding methods to insulate homes successfully has become a top priority. While replacing whole window units with double or triple glazing is a typical option, it can be excessively costly and is frequently not allowed in noted structures or preservation locations. This is where secondary glazing works as a useful, affordable option.

Secondary glazing includes installing an extra pane of glass or plastic inside an existing window. While glass was once the basic product, developments in polymers have made plastic choices increasingly popular. This guide checks out the various secondary glazing plastic choices, their advantages, and how they compare to one another.


Why Choose Plastic Over Glass?

Before diving into specific products, it is essential to understand why a property owner or center supervisor may select plastic instead of conventional glass for secondary glazing.

  1. Lightweight Nature: Plastic sheets are significantly lighter than glass. This makes them simpler to manage during DIY setups and places less pressure on existing window frames.
  2. Safety and Impact Resistance: Many plastic alternatives are virtually solid. In homes with children or in areas 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, meaning they are more efficient at avoiding 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 using basic workshop tools.

Secret Plastic Materials for Secondary Glazing

There are 3 primary kinds of plastic used for secondary glazing: Acrylic, Polycarbonate, and PETG. Each has distinct characteristics that make it suitable for various environments.

1. Acrylic (typically called Perspex or Plexiglass)

Acrylic is possibly the most typical plastic utilized for secondary glazing. It is prized for its extraordinary clearness and aesthetic resemblance to glass.

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

2. Polycarbonate (often understood as Lexan)

Polycarbonate is the "durable" option of the plastic world.  secondary glazing fitters poole  is frequently utilized in high-security environments or where extreme sturdiness is required.

  • Strength: Polycarbonate is approximately 250 times stronger than glass and is virtually solid.
  • Fire Rating: It has exceptional fire-resistant residential or commercial properties, frequently bring a Class 1 fire score.
  • Flexibility: It is more flexible than acrylic, making it easier to fit into somewhat irregular frames.
  • Constraint: It is more prone to scratching than acrylic and is usually more pricey.

3. PETG (Polyethylene Terephthalate Glycol)

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

  • Alleviate of Use: It is extremely simple to make and does not require customized drill bits.
  • Food Safe: While not constantly appropriate for glazing, its chemical resistance makes it resilient against harsh cleaner.
  • Restriction: It does not have the exact same level of UV stability as acrylic, making it more suited for windows that do not receive consistent, direct sunshine.

Relative Analysis of Plastic Materials

The following table supplies a fast recommendation to assist determine which product is finest suited for particular secondary glazing needs.

FeatureAcrylic (Perspex)PolycarbonatePETG
Effect ResistanceModerateExtreme (Unbreakable)High
Optical ClarityExcellent (Better than glass)GoodGood
UV ResistanceExcellentVaries (Requires finishing)Moderate
Scratch ResistanceModerateLowModerate
WeightLightweightLightweightLightweight
Reduce of DIY CuttingModerate (can chip)EasyEasy
Common Use CaseLiving rooms, BedroomsSecurity, Schools, ShedsWorkshops, Inner rooms

Setup Methods for Plastic Secondary Glazing

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

Magnetic Strip Systems

This is the most popular DIY method. 2 magnetic strips are utilized: one is stuck to the window frame and the other to the boundary of the plastic sheet.

  • Pros: Easy to eliminate for cleansing or throughout the summer season.
  • 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 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 maximum 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 irreversible solution.
  • Cons: Difficult to get rid of; requires noticeable holes in the window frame.

Upkeep and Care

To ensure the longevity of plastic secondary glazing, specific upkeep protocols must be followed. Unlike glass, plastics are delicate to specific chemicals.

  • Cleaning: Never use glass cleaners consisting of ammonia or alcohol (like Windex), as these can "fad" (produce small cracks) or cloud the plastic. Rather, utilize lukewarm water with a mild meal soap and a soft microfiber fabric.
  • Static Reduction: Plastics can draw in dust due to static electrical energy. Using specialized anti-static cleaners can assist keep the panels clear for longer.
  • Scratch Prevention: When cleansing, prevent circular movements. Usage long, horizontal or vertical strokes to lessen the visibility of any minor abrasions that might 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 creating a thermal break, it prevents warm air from hitting cold glass, substantially reducing interior condensation.
  • Cost Savings: Lower initial material cost and reduced heating expenses cause a high roi.
  • Preservation: Ideal for historic homes where initial windows must be protected.

Often Asked Questions (FAQ)

Does plastic secondary glazing yellow in time?

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

What density should I choose for the plastic?

For the majority of domestic windows, a density of 2mm to 4mm suffices. 2mm is very light but may "bow" in larger windows; 3mm or 4mm supplies more rigidness 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 quickly to enable ventilation. If long-term ventilation is needed, "moving" secondary glazing systems are offered, though these normally need a professional installer.

Will plastic glazing stop all condensation?

While it significantly decreases condensation by keeping the inner surface warmer, it might not eliminate it completely if there are existing moisture issues 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 likewise be "scored and snapped," though this requires practice to prevent rugged edges.


Secondary glazing utilizing plastic choices uses a flexible, effective, and affordable method to improve the thermal and acoustic performance of a structure. Whether selecting the crystal-clear surface of Acrylic or the indestructible nature of Polycarbonate, homeowners can delight in a warmer, quieter environment without the disturbance and expense of full window replacement. By selecting the ideal product and setup method, it is possible to achieve professional-grade insulation results through basic DIY improvements.