Its History Of Secondary Glazing Plastic Options

· 5 min read
Its History Of Secondary Glazing Plastic Options

Secondary Glazing Plastic Options: A Comprehensive Guide to Improving Insulation

In an age where energy effectiveness and increasing utility expenses are at the forefront of property owners' concerns, finding ways to insulate residential or commercial properties effectively has actually ended up being a top priority. While changing whole window systems with double or triple glazing is a common option, it can be excessively pricey and is frequently not allowed in noted structures or conservation locations. This is where secondary glazing acts as a practical, cost-efficient alternative.

Secondary glazing involves setting up an additional pane of glass or plastic inside an existing window. While glass was as soon as the basic product, developments in polymers have made plastic choices significantly popular. This guide checks out the numerous 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 necessary to comprehend why a property owner or facility supervisor might go with plastic rather of traditional glass for secondary glazing.

  1. Lightweight Nature: Plastic sheets are substantially lighter than glass. This makes them much easier to deal with throughout DIY setups and locations less pressure on existing window frames.
  2. Security and Impact Resistance: Many plastic choices are essentially unbreakable. In households with kids or in areas prone to high winds, the unbreakable nature of plastics like polycarbonate offers peace of mind.
  3. Thermal Insulation: Plastics are naturally much better insulators than glass. They have lower thermal conductivity, indicating they are more effective at avoiding heat from leaving through the window.
  4. Relieve of Customization: Unlike glass, which needs professional cutting and toughening, plastic sheets can frequently be cut to size utilizing standard workshop tools.

Secret Plastic Materials for Secondary Glazing

There are three primary types of plastic utilized for secondary glazing: Acrylic, Polycarbonate, and PETG. Each has special characteristics that make it suitable for different environments.

1. Acrylic (frequently known as Perspex or Plexiglass)

Acrylic is possibly the most common plastic utilized for secondary glazing. It is prized for its extraordinary clarity and aesthetic similarity to glass.

  • Clarity: Acrylic is clearer than glass, permitting more light to go through.
  • UV Resistance: It is naturally resistant to UV light, meaning it will not yellow or become brittle when exposed to direct sunshine over several years.
  • Weight: It is around 50% lighter than a glass pane of the very same density.
  • Limitation: It is more breakable than polycarbonate and can break if misused or drilled improperly.

2. Polycarbonate (often referred to as Lexan)

Polycarbonate is the "heavy-duty" alternative of the plastic world. It is often utilized in high-security environments or where severe durability is needed.

  • Strength: Polycarbonate is roughly 250 times more powerful than glass and is practically unbreakable.
  • Fire Rating: It has outstanding fireproof properties, often carrying a Class 1 fire ranking.
  • Versatility: It is more flexible than acrylic, making it much easier to fit into slightly uneven frames.
  • Restriction: It is more vulnerable to scratching than acrylic and is typically more pricey.

3. PETG (Polyethylene Terephthalate Glycol)

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

  • Ease of Use: It is really easy to produce and does not require specialized drill bits.
  • Food Safe: While not constantly pertinent for glazing, its chemical resistance makes it long lasting against harsh cleansing agents.
  • Restriction: It does not have the same level of UV stability as acrylic, making it more matched for windows that do not get constant, direct sunshine.

Relative Analysis of Plastic Materials

The following table offers a fast referral to assist identify which product is finest suited for particular secondary glazing needs.

FeatureAcrylic (Perspex)PolycarbonatePETG
Effect ResistanceModerateExtreme (Unbreakable)High
Optical ClarityExceptional (Better than glass)GoodGreat
UV ResistanceExceptionalVaries (Requires finish)Moderate
Scratch ResistanceModerateLowModerate
WeightLightweightLightweightLightweight
Alleviate of DIY CuttingModerate (can chip)EasyEasy
Normal Use CaseLiving rooms, BedroomsSecurity, Schools, ShedsWorkshops, Inner spaces

Setup Methods for Plastic Secondary Glazing

The effectiveness of secondary glazing depends greatly on the setup method used. Since plastic is light-weight, a number of non-permanent alternatives 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 border of the plastic sheet.

  • Pros: Easy to eliminate for cleansing or throughout the summer season.
  • Cons: Not as airtight as repaired systems; magnets can lose strength over numerous 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 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 straight to the frame utilizing color-coded washers and screws.

  • Pros: The most airtight and irreversible solution.
  • Cons: Difficult to remove; requires visible holes in the window frame.

Upkeep and Care

To guarantee the durability of plastic secondary glazing, particular maintenance procedures should be followed. Unlike glass, plastics are delicate to certain chemicals.

  • Cleaning: Never utilize glass cleaners containing ammonia or alcohol (like Windex), as these can "craze" (develop small cracks) or cloud the plastic. Instead, use lukewarm water with a mild dish soap and a soft microfiber fabric.
  • Fixed Reduction: Plastics can draw in dust due to fixed electrical power. Utilizing customized anti-static cleaners can help keep the panels clear for longer.
  • Scratch Prevention: When cleaning, prevent circular movements.  secondary glazing fitters leighton buzzard , horizontal or vertical strokes to minimize the presence of any small abrasions that may happen.

The Benefits of Plastic Glazing: At a Glance

  • Noise Reduction: Creates an acoustic barrier that can decrease external noise by approximately 50-70%.
  • Condensation Control: By producing a thermal break, it avoids warm air from striking cold glass, considerably reducing interior condensation.
  • Cost Savings: Lower preliminary product expense and minimized heating bills cause a high return on investment.
  • Conservation: Ideal for historical homes where initial windows need to be protected.

Regularly Asked Questions (FAQ)

Does plastic secondary glazing yellow gradually?

If top quality 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 finish, so it is essential to purchase "UV-stabilized" sheets for south-facing windows.

What thickness should I choose for the plastic?

For the majority of domestic windows, a thickness of 2mm to 4mm is sufficient. 2mm is really light but might "bow" in larger windows; 3mm or 4mm offers 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 gotten rid of rapidly to allow ventilation. If permanent ventilation is required, "moving" secondary glazing systems are offered, though these generally require an expert installer.

Will plastic glazing stop all condensation?

While it substantially decreases condensation by keeping the inner surface warmer, it might not eliminate it completely 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, most 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 choices offers a versatile, efficient, and budget-friendly way to boost the thermal and acoustic efficiency of a structure. Whether picking the crystal-clear finish of Acrylic or the unbreakable nature of Polycarbonate, property owners can enjoy a warmer, quieter environment without the disruption and cost of complete window replacement. By choosing the best material and setup method, it is possible to achieve professional-grade insulation results through simple DIY enhancements.