7 Simple Changes That Will Make The Biggest Difference In Your Secondary Glazing Plastic Options

· 5 min read
7 Simple Changes That Will Make The Biggest Difference In Your Secondary Glazing Plastic Options

Secondary Glazing Plastic Options: A Comprehensive Guide to Improving Insulation

In an era where energy performance and increasing utility costs are at the forefront of house owners' issues, finding ways to insulate homes successfully has actually ended up being a priority. While changing whole window systems with double or triple glazing is a typical service, it can be prohibitively costly and is typically not permitted in noted structures or sanctuary. This is where secondary glazing works as a useful, economical alternative.

Secondary glazing includes setting up a supplemental pane of glass or plastic inside an existing window. While glass was as soon as the basic material, advancements in polymers have made plastic choices increasingly popular. This guide checks out the various secondary glazing plastic options, their advantages, and how they compare to one another.


Why Choose Plastic Over Glass?

Before diving into particular products, it is vital to understand why a property owner or facility supervisor may go with plastic instead of traditional glass for secondary glazing.

  1. Lightweight Nature: Plastic sheets are significantly lighter than glass. This makes them simpler to manage throughout DIY installations and places less strain on existing window frames.
  2. Security and Impact Resistance: Many plastic alternatives are essentially solid. In families with kids or in areas susceptible to high winds, the shatterproof nature of plastics like polycarbonate provides comfort.
  3. Thermal Insulation: Plastics are naturally better insulators than glass. They have lower thermal conductivity, suggesting they are more reliable at avoiding heat from escaping through the window.
  4. Relieve of Customization: Unlike glass, which needs professional cutting and toughening, plastic sheets can frequently be cut to size using fundamental 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 special qualities that make it ideal for various environments.

1. Acrylic (often known as Perspex or Plexiglass)

Acrylic is perhaps the most common plastic utilized for secondary glazing. It is treasured for its exceptional clearness and aesthetic similarity to glass.

  • Clarity: Acrylic is clearer than glass, permitting more light to travel through.
  • UV Resistance: It is naturally resistant to UV light, meaning it will not yellow or end up being breakable when exposed to direct sunlight over many years.
  • Weight: It is roughly 50% lighter than a glass pane of the same thickness.
  • Restriction: It is more brittle than polycarbonate and can break if handled roughly or drilled improperly.

2. Polycarbonate (often referred to as Lexan)

Polycarbonate is the "heavy-duty" option of the plastic world. It is often utilized in high-security environments or where severe resilience is required.

  • Strength: Polycarbonate is roughly 250 times stronger than glass and is essentially unbreakable.
  • Fire Rating: It has exceptional fireproof homes, often carrying a Class 1 fire score.
  • Versatility: It is more versatile than acrylic, making it much easier to fit into somewhat irregular frames.
  • Limitation: It is more vulnerable to scratching than acrylic and is generally more expensive.

3. PETG (Polyethylene Terephthalate Glycol)

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

  • Alleviate of Use: It is extremely easy to fabricate and does not require specialized drill bits.
  • Food Safe: While not constantly pertinent for glazing, its chemical resistance makes it resilient versus severe 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 continuous, direct sunshine.

Relative Analysis of Plastic Materials

The following table provides a quick reference to help figure out which material is finest matched for specific secondary glazing requirements.

FeatureAcrylic (Perspex)PolycarbonatePETG
Effect ResistanceModerateSevere (Unbreakable)High
Optical ClarityOutstanding (Better than glass)GoodGood
UV ResistanceExcellentVaries (Requires finish)Moderate
Scratch ResistanceModerateLowModerate
WeightLightweightLightweightLight-weight
Relieve of DIY CuttingModerate (can chip)EasyEasy
Typical Use CaseLiving rooms, BedroomsSecurity, Schools, ShedsWorkshops, Inner rooms

Setup Methods for Plastic Secondary Glazing

The efficiency of secondary glazing depends greatly on the installation technique utilized. Due to the fact that plastic is light-weight, a number of non-permanent choices are offered.

Magnetic Strip Systems

This is the most popular DIY method.  click here  are used: one is abided by the window frame and the other to the perimeter of the plastic sheet.

  • Pros: Easy to eliminate for cleansing or during the summer season.
  • Cons: Not as airtight as fixed systems; magnets can lose strength over numerous years.

Clip and U-Channel Systems

This includes 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 permanent service.
  • Cons: Difficult to eliminate; needs visible holes in the window frame.

Upkeep and Care

To guarantee the longevity of plastic secondary glazing, particular upkeep procedures need to be followed. Unlike glass, plastics are delicate to specific chemicals.

  • Cleansing: Never utilize glass cleaners consisting of ammonia or alcohol (like Windex), as these can "trend" (produce small cracks) or cloud the plastic. Instead, utilize lukewarm water with a mild dish soap and a soft microfiber cloth.
  • Fixed Reduction: Plastics can draw in dust due to static electrical power. Utilizing specific anti-static cleaners can help keep the panels clear for longer.
  • Scratch Prevention: When cleansing, avoid circular movements. Usage long, horizontal or vertical strokes to decrease the exposure of any small 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 producing a thermal break, it avoids warm air from hitting cold glass, significantly minimizing interior condensation.
  • Expense Savings: Lower preliminary product expense and decreased heating costs result in a high roi.
  • Preservation: Ideal for historic homes where initial windows need to be maintained.

Regularly Asked Questions (FAQ)

Does plastic secondary glazing yellow in time?

If premium Acrylic (Perspex) is utilized, it will not yellow for a minimum of 10-- 20 years. Standard Polycarbonate might yellow if it does not have a UV-resistant finish, so it is necessary to buy "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 is sufficient. 2mm is really light however may "bow" in bigger 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 used, the panel can be gotten rid of rapidly to permit ventilation. If permanent ventilation is needed, "sliding" secondary glazing systems are readily available, though these normally need a professional installer.

Will plastic glazing stop all condensation?

While it significantly decreases condensation by keeping the inner surface area warmer, it might not eliminate it totally if there are existing dampness problems 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 likewise be "scored and snapped," though this requires practice to prevent jagged edges.


Secondary glazing utilizing plastic choices provides a versatile, effective, and affordable way to improve the thermal and acoustic efficiency of a building. Whether picking the crystal-clear surface of Acrylic or the unbreakable nature of Polycarbonate, property owners can take pleasure in a warmer, quieter environment without the disturbance and cost of full window replacement. By picking the ideal product and installation approach, it is possible to attain professional-grade insulation results through simple DIY enhancements.