10 Things You'll Need To Know About Secondary Glazing Plastic Options

· 5 min read
10 Things You'll Need To Know About Secondary Glazing Plastic Options

Secondary Glazing Plastic Options: A Comprehensive Guide to Improving Insulation

In a period where energy performance and rising utility costs are at the forefront of homeowners' issues, finding ways to insulate properties successfully has actually ended up being a priority. While replacing entire window systems with double or triple glazing is a typical solution, it can be excessively pricey and is often not allowed in noted structures or conservation locations. This is where secondary glazing works as a useful, economical option.

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


Why Choose Plastic Over Glass?

Before diving into specific products, it is vital to comprehend why a property owner or facility supervisor might select plastic rather of conventional glass for secondary glazing.

  1. Light-weight Nature: Plastic sheets are substantially lighter than glass. This makes them easier to deal with during DIY installations and locations less strain on existing window frames.
  2. Security and Impact Resistance: Many plastic options are virtually solid. In households with kids or in locations vulnerable to high winds, the shatterproof nature of plastics like polycarbonate offers assurance.
  3. Thermal Insulation: Plastics are naturally better insulators than glass. They have lower thermal conductivity, suggesting they are more efficient at preventing heat from getting away through the window.
  4. Alleviate of Customization: Unlike glass, which needs professional cutting and toughening, plastic sheets can typically be cut to size utilizing fundamental workshop tools.

Secret Plastic Materials for Secondary Glazing

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

1. Acrylic (typically understood as Perspex or Plexiglass)

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

  • Clearness: Acrylic is clearer than glass, permitting more light to travel through.
  • UV Resistance: It is naturally resistant to UV light, indicating it will not yellow or become brittle when exposed to direct sunshine over lots of years.
  • Weight: It is around 50% lighter than a glass pane of the exact same density.
  • Restriction: It is more fragile than polycarbonate and can split if mauled or drilled incorrectly.

2. Polycarbonate (typically called Lexan)

Polycarbonate is the "durable" choice of the plastic world. It is regularly used in high-security environments or where extreme toughness is required.

  • Strength: Polycarbonate is roughly 250 times more powerful than glass and is virtually unbreakable.
  • Fire Rating: It has outstanding fireproof properties, frequently carrying a Class 1 fire ranking.
  • Versatility: It is more flexible than acrylic, making it simpler to suit a little irregular frames.
  • Limitation: It is more susceptible 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 performance.

  • Alleviate of Use: It is very easy to make and does not require specialized drill bits.
  • Food Safe: While not constantly relevant for glazing, its chemical resistance makes it long lasting against extreme cleaning representatives.
  • Restriction: It does not have the exact same level of UV stability as acrylic, making it more fit for windows that do not get constant, direct sunshine.

Comparative Analysis of Plastic Materials

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

FunctionAcrylic (Perspex)PolycarbonatePETG
Effect ResistanceModerateExtreme (Unbreakable)High
Optical ClarityExceptional (Better than glass)GoodExcellent
UV ResistanceExcellentVaries (Requires finishing)Moderate
Scratch ResistanceModerateLowModerate
WeightLight-weightLightweightLight-weight
Ease of DIY CuttingModerate (can chip)EasyEasy
Typical Use CaseLiving rooms, BedroomsSecurity, Schools, ShedsWorkshops, Inner rooms

Setup Methods for Plastic Secondary Glazing

The effectiveness of secondary glazing depends heavily on the installation approach used. Because  Windows And Doors R Us  is lightweight, numerous non-permanent choices are available.

Magnetic Strip Systems

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

  • Pros: Easy to get rid of for cleaning or during the summer months.
  • Cons: Not as airtight as fixed systems; magnets can lose strength over many 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 place or held by the clips.

  • Pros: Provides a more safe 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 irreversible option.
  • Cons: Difficult to eliminate; needs noticeable holes in the window frame.

Maintenance and Care

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

  • Cleansing: Never use glass cleaners including ammonia or alcohol (like Windex), as these can "craze" (produce small cracks) or cloud the plastic. Instead, use lukewarm water with a moderate dish soap and a soft microfiber fabric.
  • Static Reduction: Plastics can bring in dust due to fixed electrical energy. Using customized anti-static cleaners can assist keep the panels clear for longer.
  • Scratch Prevention: When cleansing, prevent circular motions. Use long, horizontal or vertical strokes to reduce the exposure of any minor abrasions that may take place.

The Benefits of Plastic Glazing: At a Glance

  • Sound Reduction: Creates an acoustic barrier that can reduce external sound by up to 50-70%.
  • Condensation Control: By creating a thermal break, it avoids warm air from striking cold glass, significantly reducing interior condensation.
  • Cost Savings: Lower initial product expense and reduced heating costs lead to a high return on investment.
  • Conservation: Ideal for historic homes where original windows need to be maintained.

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. Standard Polycarbonate may yellow if it does not have a UV-resistant finish, so it is essential to buy "UV-stabilized" sheets for south-facing windows.

What density should I pick for the plastic?

For most domestic windows, a thickness of 2mm to 4mm suffices. 2mm is really light however might "bow" in larger windows; 3mm or 4mm provides more rigidness and much better sound insulation.

Can I still open my windows?

If a magnetic or clip-on system is utilized, the panel can be eliminated quickly to enable ventilation. If irreversible ventilation is required, "sliding" secondary glazing systems are available, though these usually require a professional installer.

Will plastic glazing stop all condensation?

While it considerably minimizes condensation by keeping the inner surface warmer, it might not eliminate it completely if there are existing wetness problems 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 needs practice to prevent jagged edges.


Secondary glazing using plastic choices offers a versatile, effective, and economical method to boost the thermal and acoustic performance of a structure. Whether choosing the crystal-clear surface of Acrylic or the unbreakable nature of Polycarbonate, property owners can delight in a warmer, quieter environment without the disruption and cost of full window replacement. By selecting the right material and installation method, it is possible to accomplish professional-grade insulation results through basic DIY improvements.