13 Things You Should Know About Secondary Glazing Acrylic Options That You Might Not Have Known

· 5 min read
13 Things You Should Know About Secondary Glazing Acrylic Options That You Might Not Have Known

Enhancing Home Comfort: A Comprehensive Guide to Secondary Glazing Acrylic Options

Windows are frequently the most substantial source of heat loss and sound infiltration in residential homes. While replacing original windows with double glazing is a common option, it is not constantly practical-- particularly in heritage buildings or for house owners on a strict budget. As an option, secondary glazing has ended up being a significantly popular solution. Among the numerous products offered, acrylic sheets have become a frontrunner.

This post checks out the different acrylic alternatives for secondary glazing, comparing them to standard glass and outlining the advantages, installation methods, and upkeep needed to preserve a more energy-efficient and quieter home.


Understanding Secondary Glazing

Secondary glazing includes the installation of a discrete, supplementary internal window to an existing single-glazed window. Unlike complete replacement, it leaves the external structure of the home untouched. This makes it a preferred option for "Listed Buildings" or residential or commercial properties in conservation areas where planning approval for new uPVC or double-glazed windows is frequently denied.

Secondary glazing works by creating a pocket of still air in between the initial window and the secondary pane. This "buffer zone" serves as a powerful insulator, reducing thermal transfer and moistening external noise.

Why Choose Acrylic Over Glass?

When selecting materials for secondary glazing, the 2 main options are glass and plastic (acrylic or polycarbonate). While glass is traditional, acrylic deals numerous benefits that make it particularly appropriate for DIY jobs and older frames.

Table 1: Acrylic vs. Traditional Glass for Secondary Glazing

FeatureAcrylic (Perspex/Plexiglass)Standard Glass
Weight50% lighter than glassHeavy; needs strong frames
Impact Resistance10-- 15 times more powerful than glassFragile and vulnerable to shattering
Thermal InsulationExcellent (Lower thermal conductivity)Moderate
Clearness92% Light transmission (Clearer than glass)Varies (Can have a green tint)
Ease of InstallationExtremely high (DIY friendly)Professional installation frequently needed
UV ResistanceHigh (with UV-stabilized grades)Naturally high
ExpenseGenerally more inexpensiveHigher material and labor expenses

Types of Acrylic Sheets for Secondary Glazing

Not all acrylic is developed equal. To achieve the finest results, property owners should understand the variations available on the market.

1. Extruded Acrylic

Extruded acrylic is the most economical alternative. It is produced by pushing the acrylic mass through a die. While it is exceptional for basic secondary glazing, it has somewhat higher tolerances in thickness and is a bit more susceptible to chemical stress than cast acrylic.

2. Cast Acrylic

Cast acrylic is produced by pouring the liquid components into a mold. This leads to a much harder, more steady material with exceptional optical clearness. For big windows where visual distortion must be decreased, cast acrylic is the premium option.

3. UV-Stabilized Acrylic

Basic acrylic is naturally resistant to yellowing, but UV-stabilized alternatives are specifically crafted for windows that deal with direct, extreme sunlight. These sheets guarantee that the material remains crystal clear for decades without devenir fragile.

4. Abrasion-Resistant Acrylic

One of the primary downsides of acrylic is its vulnerability to scratches. Abrasion-resistant (or "hard-coated") acrylic functions a thin, ceramic-like covering that safeguards the surface area from scuffs and cleaning-related scratches, making it perfect for high-traffic areas.


Secret Benefits of Acrylic Secondary Glazing

Thermal Performance and Energy Savings

The main inspiration for secondary glazing is heat retention. Acrylic has lower thermal conductivity than glass, implying it is naturally much better at preventing heat from leaving. By setting up a 3mm or 4mm acrylic sheet, a household can substantially decrease its U-value (the rate of heat loss), leading to lower energy costs and a smaller sized carbon footprint.

Acoustic Insulation (Noise Reduction)

Acrylic is extremely reliable at decreasing high-frequency sounds, such as traffic or area chatter. Because acrylic is less stiff than glass, it does not vibrate at the exact same frequencies, helping to separate acoustic waves before they get in the room. For maximum sound reduction, an air space of 100mm to 200mm in between the primary window and the acrylic pane is advised.

Health and Condensation Control

Condensation occurs when warm, moist air strikes a cold window surface. By supplying an internal barrier, acrylic secondary glazing keeps the inner surface area of the "window" warmer, which considerably decreases the likelihood of condensation. This, in turn, prevents the growth of black mold, which can have harmful impacts on breathing health.


Setup Methods for Acrylic Secondary Glazing

One of the factors property owners prefer acrylic is the variety of non-permanent installation choices readily available.

Table 2: Common Installation Methods

ApproachBest ForDescription
Magnetic StripsAlleviate of removalUsing self-adhesive magnetic tape on the window frame and the acrylic sheet. This permits fast elimination in summertime.
Clip & & Screw SystemLong-term stabilityPlastic clips or turn-buttons hold the sheet versus a foam seal. More secure for larger, heavier panes.
U-Channel EdgingLooksA plastic or aluminum channel is installed to the frame, and the acrylic sheet slides or clips into it.
Adhesive VelcroBudget DIYLow-cost option using hook-and-loop fasteners. Less airtight than magnetic or clip systems.

Step-by-Step Selection Guide

To guarantee the very best results, one must follow these steps when choosing their acrylic secondary glazing:

  1. Measure Accurately: Measure the height and width of the window recess. It is normally recommended to deduct 3mm from each side to allow for thermal growth.
  2. Determine Thickness:
  • 3mm: Standard for little to medium windows.
  • 4mm-5mm: Better for big windows to prevent "bowing."
  1. Pick the Finish: While "Clear" is basic, "Frosted" acrylic can be used for restroom secondary glazing to supply privacy without sacrificing light.
  2. Select the Fixing System: Ensure the picked fixing approach can support the weight of the sheet size.

Maintenance and Care for Acrylic Sheets

To preserve the longevity and clarity of acrylic secondary glazing, specific cleaning procedures must be followed.

  • Avoid Harsh Chemicals: Never utilize glass cleaners consisting of ammonia or alcohol (like Windex), as these can "fad" or cloud the acrylic.
  • Usage Soft Cloths: Microfiber or soft cotton cloths are vital. Prevent paper towels, which can be abrasive.
  • Moderate Soaps: An easy service of lukewarm water and a drop of mild dish soap is usually enough.
  • Anti-Static Treatments: Using an anti-static cleaner can assist prevent the acrylic from drawing in dust, which is common with plastic surfaces.

Regularly Asked Questions (FAQ)

1. Does acrylic secondary glazing stop condensation?

Yes. By developing  Windows And Doors R Us , the internal secondary pane stays closer to room temperature level, avoiding the warm air in the room from condensing on the cold primary glass.

2. Can I still open my windows?

If utilizing magnetic or clip-on systems, the acrylic sheet can be easily eliminated or set aside to allow the main window to be opened. For sash windows, sliding secondary glazing systems are readily available, though these typically involve a frame.

3. Is acrylic better than polycarbonate?

Acrylic is more UV-resistant and provides much better clarity (it does not have the minor yellow/grey tint often found in polycarbonate). However, polycarbonate is essentially solid, making it much better for high-security applications or areas prone to heavy impacts.

4. For how long does acrylic secondary glazing last?

Premium UV-stabilized acrylic can last 10 to 20 years without substantial yellowing or destruction, supplied it is cleaned up properly.

5. Will it look apparent from the exterior?

Among the primary advantages of secondary glazing is its low visual impact. Since the acrylic is clear and installed inside, it is hardly ever noticeable from the exterior of the residential or commercial property.


Acrylic secondary glazing represents a versatile, economical, and highly effective method to update home insulation. Whether the objective is to lower heating expenses, moisten the sound of a hectic street, or secure a historical home from the aspects, acrylic deals a lightweight and DIY-friendly alternative to standard glass. By selecting the right grade of product and an appropriate setup method, house owners can take pleasure in a warmer, quieter, and more comfy living environment without the expense of overall window replacement.