A Good Rant About Secondary Glazing Acrylic Options

· 5 min read
A Good Rant About Secondary Glazing Acrylic Options

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

Windows are frequently the most considerable source of heat loss and noise infiltration in homes. While replacing original windows with double glazing is a common service, it is not always feasible-- especially in heritage buildings or for house owners on a rigorous budget. As an option, secondary glazing has become a significantly popular service. Among the different products available, acrylic sheets have actually emerged as a frontrunner.

This post explores the numerous acrylic alternatives for secondary glazing, comparing them to standard glass and describing the benefits, setup methods, and maintenance needed to keep a more energy-efficient and quieter home.


Comprehending Secondary Glazing

Secondary glazing involves the installation of a discrete, supplemental internal window to an existing single-glazed window. Unlike total replacement, it leaves the external structure of your house unblemished. This makes it a preferred alternative for "Listed Buildings" or residential or commercial properties in sanctuary where planning authorization for brand-new uPVC or double-glazed windows is frequently denied.

Secondary glazing works by creating a pocket of still air between the initial window and the secondary pane. This "buffer zone" acts as an effective insulator, minimizing thermal transfer and dampening external noise.

Why Choose Acrylic Over Glass?

When selecting products for secondary glazing, the 2 primary options are glass and plastic (acrylic or polycarbonate). While glass is conventional, acrylic deals several advantages that make it particularly suitable for DIY jobs and older frames.

Table 1: Acrylic vs. Traditional Glass for Secondary Glazing

FeatureAcrylic (Perspex/Plexiglass)Standard Glass
Weight50% lighter than glassHeavy; requires strong frames
Impact Resistance10-- 15 times more powerful than glassFragile and prone to shattering
Thermal InsulationExcellent (Lower thermal conductivity)Moderate
Clarity92% Light transmission (Clearer than glass)Varies (Can have a green tint)
Ease of InstallationReally high (DIY friendly)Professional installation often needed
UV ResistanceHigh (with UV-stabilized grades)Naturally high
CostUsually more budget friendlyHigher material and labor costs

Types of Acrylic Sheets for Secondary Glazing

Not all acrylic is created equal. To achieve the very best outcomes, property owners need to comprehend the variations offered on the market.

1. Extruded Acrylic

Extruded acrylic is the most cost-effective alternative. It is manufactured by pushing the acrylic mass through a die. While it is outstanding for general secondary glazing, it has somewhat higher tolerances in thickness and is a bit more vulnerable to chemical stress than cast acrylic.

2. Cast Acrylic

Cast acrylic is produced by putting the liquid components into a mold. This results in a much harder, more stable material with exceptional optical clearness. For large windows where visual distortion should be reduced, cast acrylic is the premium choice.

3. UV-Stabilized Acrylic

Basic acrylic is naturally resistant to yellowing, but UV-stabilized choices are specifically engineered for windows that deal with direct, intense sunshine. These sheets ensure that the product remains clear for years without devenir brittle.

4. Abrasion-Resistant Acrylic

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


Key Benefits of Acrylic Secondary Glazing

Thermal Performance and Energy Savings

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

Acoustic Insulation (Noise Reduction)

Acrylic is highly efficient at lowering high-frequency noises, such as traffic or community chatter. Due to the fact that acrylic is less stiff than glass, it does not vibrate at the very same frequencies, assisting to separate sound waves before they get in the room. For optimum sound decrease, an air gap of 100mm to 200mm between the main window and the acrylic pane is advised.

Health and Condensation Control

Condensation takes place when warm, moist air strikes a cold window surface area. By offering an internal barrier, acrylic secondary glazing keeps the inner surface area of the "window" warmer, which substantially reduces the possibility of condensation. This, in turn, avoids the development of black mold, which can have destructive impacts on breathing health.


Installation Methods for Acrylic Secondary Glazing

One of the reasons house owners choose acrylic is the variety of non-permanent installation choices readily available.

Table 2: Common Installation Methods

TechniqueBest ForDescription
Magnetic StripsAlleviate of eliminationUtilizing self-adhesive magnetic tape on the window frame and the acrylic sheet. This enables for quick elimination in summer.
Clip & & Screw SystemLong-term stabilityPlastic clips or turn-buttons hold the sheet versus a foam seal. More safe for bigger, much heavier panes.
U-Channel EdgingLooksA plastic or aluminum channel is installed to the frame, and the acrylic sheet slides or clips into it.
Adhesive VelcroSpending plan DIYLow-cost solution using hook-and-loop fasteners. windowsanddoors-r-us.co.uk than magnetic or clip systems.

Step-by-Step Selection Guide

To make sure the very best results, one ought to follow these steps when picking their acrylic secondary glazing:

  1. Measure Accurately: Measure the height and width of the window recess. It is generally recommended to deduct 3mm from each side to allow for thermal expansion.
  2. Determine Thickness:
  • 3mm: Standard for small to medium windows.
  • 4mm-5mm: Better for large windows to prevent "bowing."
  1. Select the Finish: While "Clear" is basic, "Frosted" acrylic can be used for restroom secondary glazing to offer personal privacy without sacrificing light.
  2. Select the Fixing System: Ensure the selected repairing technique can support the weight of the sheet size.

Maintenance and Care for Acrylic Sheets

To preserve the durability and clarity of acrylic secondary glazing, specific cleaning protocols need to be followed.

  • Avoid Harsh Chemicals: Never utilize glass cleaners containing ammonia or alcohol (like Windex), as these can "trend" or cloud the acrylic.
  • Usage Soft Cloths: Microfiber or soft cotton cloths are vital. Avoid paper towels, which can be abrasive.
  • Mild Soaps: An easy option of lukewarm water and a drop of moderate dish soap is usually adequate.
  • Anti-Static Treatments: Using an anti-static cleaner can help prevent the acrylic from attracting dust, which is typical with plastic surface areas.

Regularly Asked Questions (FAQ)

1. Does acrylic secondary glazing stop condensation?

Yes. By creating a thermal barrier, the internal secondary pane remains closer to room temperature level, avoiding the warm air in the space from condensing on the cold main glass.

2. Can I still open my windows?

If using magnetic or clip-on systems, the acrylic sheet can be quickly removed or reserved to allow the main window to be opened. For sash windows, sliding secondary glazing systems are available, though these normally include a frame.

3. Is acrylic much better than polycarbonate?

Acrylic is more UV-resistant and uses much better clarity (it does not have the small yellow/grey tint frequently found in polycarbonate). Nevertheless, polycarbonate is virtually unbreakable, making it much better for high-security applications or areas vulnerable to heavy impacts.

4. How long does acrylic secondary glazing last?

Premium UV-stabilized acrylic can last 10 to 20 years without considerable yellowing or deterioration, offered it is cleaned correctly.

5. Will it look apparent from the exterior?

One of the main benefits of secondary glazing is its low visual impact. Due to the fact that the acrylic is clear and set up inside, it is rarely obvious from the exterior of the property.


Acrylic secondary glazing represents a versatile, cost-efficient, and highly effective way to upgrade home insulation. Whether the objective is to lower heating expenses, moisten the sound of a busy street, or safeguard a historic home from the aspects, acrylic offers a light-weight and DIY-friendly alternative to conventional glass. By selecting the best grade of product and a suitable installation approach, house owners can delight in a warmer, quieter, and more comfy living environment without the expense of total window replacement.