There are literally dozens of different glazing types and window glass available. These range from 3mm float clear glass all the way out to 20mm acoustic laminate glazing.

You’ll find 3 mm float clear glass in Old sash windows, clear legal to install now at standard we have to install 4mm float glass. High-end acoustic glazing is found in buildings such as airport terminals.

In this article we’re going to look at all different glazing and window glass types.

Clear float glass

Clear float glass comes in a variety of thicknesses most commonly 3mm, 4 mm, 6mm, and 8 mm. This class is not toughened and easily breaks under any heavy impact. That said the 8 mm and 6 mm variant are far more durable than the fine float glass.

Typically this glass is installed in traditional sliding sash windows that are single glazed. Some old metal crittall Windows also have single glazed window glass.

Clear float glass is extremely cheap if bought in sheets directly from manufacturer. A pane of glass in a glass shop with markup may only cost you anywhere between £20 and £50.

Laminate safety glass

Laminate safety glass comes in 4.4mm, 6.4mm, and 8.4mm. The most common laminate safety glass is 6.4 mm and this is often found in doors, both internally and externally. This class typically costs anywhere between £35 and £70 per piece for a door.

The 4.4mm version has been designed for tight rebates and ideal for single glazed sash windows. The 8.4mm version is typically suited to more heavy-duty fixed window.

There is also a window glass called white laminate which is installed in two doors of bathrooms to obscure the view. This particular glass looks very nice and it cleans very easily. Typically this glass costs between 50 and £100 per piece for a door it’s a little bit expensive but looks beautiful.

Toughened glass

Toughened Glass has a variety of uses most notably for sash windows and casement of all varieties beer UPVC, aluminium, or timber. Toughened glass provides extra strength and durability as well as safety without increasing the weight of a double glazed unit. Toughened glass is simply 4mm glass tempered and heat treated. This class typically costs between 35 and £70 per piece if bought in bulk.

Acoustic laminate

Acoustic laminate comes in a whole variety of sizes from 6.8 mm all the way up to 28mm. Most typically in windows you’ll find 6.8 mm or 8.8 mm.
This glass is extremely effective at reducing noise pollution. Is combined in a double glazed unit with 4 mmm standard or toughened glass. Provides different glass thicknesses, change that stop the different sound wave frequencies. Assuming that the windows well sealed this Glass has incredible acoustic properties.

Typically a pane of acoustic laminate glass cost anywhere between £100 and £200. It’s unusual however, just one or two pieces of acoustic laminate glass. It’s more often that these are incorporated into casement windows and sash windows.

Glazing comparison example.

Let’s take a little look at these glass types incorporated into different windows. In this example we will look at the cost difference between standard float units and acoustic laminate units.

Table of price difference between casement and sash windows

Immediately you can see the difference in price is around about £300 per window in casements and £450 in sash windows. The reason sash windows are more expensive still is because they also attractive counterbalance mechanism cost. The weight of the sash needs to be adjusted according to the weight of the glass.

Casement windows do not suffer for this additional cost as all of the weight is on the hinges which are rated for acoustic laminate no problem at all.

Ultimately good value for money here lay in how much of an issue sound reduction is for you. Is a big deal if you’re suffering from low quality noise pollution. Railway lines, or neighbours dogs barking. For whatever reason you feel you need the protection, there is a glazing solution. Window glass has a come along last 100 years.