Security of double glazing vs single glazing

Single glazed windows and doors are not as secure as double glazed glass. That’s because single glazed windows are more vulnerable and easier to break by thieves wanting to enter your property.

Why choose double glazed windows and doors

Security Windows

Safetec Inside

The gasket around the frame improves thermal insulation and prevents the sash from being forced open easily.

Bonding inside

Bonding Inside

The window’s glass pane is bonded by adhesive around the entire frame to prevent the sash from being pried open

Security Windows

RC Rated

European standards have been established for burglary protection which ranges from RC1 to RC6 (RC stands for resistance class).

Increase home security with Winplex uPVC double glazing

German-designed with security in mind

Winplex offers various thickness levels for our double glazed glass, as well as laminate and toughened glass.


Our standard glass option is 2 layers of 4mm Toughened glass with argon gas.


Guardsafe Glass: Mid- High Level of Security (8.38mm Laminate x Argon x 5mm Toughened).


Guardsafe + Glass: High Level of Security (8.38 Laminate x Argon x 8.38 Laminate).

What thickness to choose for your double glazed windows – it depends on what you want!

Thicker is more expensive, however 8mm glass is virtually unbreakable and what they use for bulletproof glass.

Then again, do you need glass this thick? Our standard 4mm toughened glass is enough to slow people from breaking the glass to give you time to call the cops, alternatively, it will make enough noise that the neighbours can also hear.

Winplex Multi-locking system

Winplex uses a multi-locking system for our double glazed windows, which makes it difficult for burglars and other intruders to use a crowbar to get in.

What is laminated glass?

Laminated glass is constructed of two plies of glass which are bonded together with interlayers. In the event that it shatters, the glass will hold together. The most well-known example of laminated glass are car windshields.

What is toughened glass?

Toughened or tempered glass is a type of safety glass created using controlled thermal or chemical treatments to increase its strength. It can be up to five times stronger than regular glass. The most well-known example is the screen used in modern smartphones.

uPVC frames vs. Timber and Aluminium

Winplex thinks outside the box–literally! We don’t just apply security features in our double glazed glass and locking mechanism, we made sure that our window and door frames are just as tough.

DIN EN 1627

RC 1 N
RC 2 N
RC 2
RC 3
RC 4
RC 5
RC 6

Period of resistance

3 min
3 min
3 min
5 min
10 min
15 min
20 min

Type of burglar / method used

Components in this category only offer basic protection against attempted break-ins using physical strength, such as kicking, pulling, etc. In this class, only windows with standard glass are listed.
Here, opportunist burglars use simple tools, such as screwdrivers, pliers, chocks, etc., to force open the locked component. As an attack on the glass should be ruled out, this glass uses standard glass only.
The type of burglar and method used are the same as the previous class. However, safety glass in accordance with EN 356 is required from class RC 2 and above.
The practised criminal uses an additional screwdriver and crowbar to break open the locked element.
To break in, the experienced criminal uses impact tools, saws and a cordless drill.
In addition, the experienced criminal uses electrical tools, such as drills, jigsaws, reciprocating saws and angle grinders with a maximum diameter of 125 mm.
The only difference to the previous resistance class is the use of an angle grinder with a maximum diameter of 250 mm.


How do you make your double glazed windows secure?
All of our uPVC double glazed windows are designed and built with security in mind.

Double glazing offers greater security than single glazing by nature. This is due to the fact that there are 2 panes of glass, thus making it harder to break. All our secure windows also feature the industry-leading multi-locking systems.

Should double glazed windows get condensation?
Condensation on the outside of new double glazed windows is not unusual; in fact, it’s perfectly normal. What happens when this occurs? The window blocks heat from inside your home reaching its exterior thus causing a coolant effect and leading to condensation formation at those locations where there are no insulation materials between you and nature’s elements such as cold winds or harsh sunlight.
What is the best option for double glazing - toughened glass or laminated glass?
Toughened glass and Laminated glass in double glazed windows and doors are types of “safety” glass. It is a common misconception that toughened glass, due to its name, adds strength or “toughness”, and it’s capable of withstanding considerable force or impact. However, toughened glass is not the same as bulletproof glass. Toughened glass is safer to break than float glass as it will not break into sharp, dangerous blades, but rather into small, blunt pieces that will not slice or cut in an accident.

Laminated glass will crack when it’s met with force, but it’s unlikely to smash because of a thin layer of laminate that will hold the broken glass together. Keep in mind though that it can be dangerous in a situation where you may need to break glass to escape, such as a fire.

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