Glass Types & Weights

Glass Options for Secondary Glazing

Clearview secondary glazing is available with a range of glass options, including toughened, laminated and a choice of obscure finishes. There are choices for thermal, security, acoustic and privacy. Our standard option is 4mm toughened glass, giving enhanced safety and security – and, of course, meeting Building Regulations.

Given the range of glass choice it is understandably a confusing area as to which is the right glass for you. It is also very common for the glass to be considered as critical to the performance, whilst it is important it may not be as significant as you may think. You may end up paying more than you need or be put off purchasing when comparing prices without a full grasp of the facts.

At Clearview, we want you to get the best advice for your specific and individual needs maximising the best performance within an affordable budget.

The number one insulation performance enhancement is simply installing Clearview Secondary Glazing, the glass is then just fine tuning to optimise the final benefit. to get the best outcome, we recommend:

  • For sound proofing: maximise the glass to glass air-gap, if you can achieve 100mm or greater, 150mm to 200mm is the best. Then subject to your individual sensitivity to the noise problem and budget, choose a thicker glass. If your window design is such that a reasonable gap is not possible, then a thicker or acoustic glass can offset some of this distance limitation. If you compromise the air-gap you will compromise performance.
  • For Thermal Insulation: The air-gap is less critical and we recommend 50mm to 80mm as a reasonable distance. Glass thickness is also far less important for thermal insulation and will do little to keep more heat in or cold out. Using a Low-E (low emissivity glass) gan offer a 5% to 10% enhancement over standard glass but is affected by the condition of the primary window. 
  • Condensation: following the above thermal principle is the same for tackling condensation, whilst secondary glazing cannot guarantee complete eradication of the problem, it does have a very good track record of significantly reducing the problem and enabling a far more effective management option.
  • Security: Both toughened and laminated glass are very good security enhancements, laminates in particular , just by secondary glazing being installed, would be intruders are often put off attempting a break-in as they see a second layer of defence and a further obstacle to tackle, they usually move on to a less challenging window. 

 

4mm Toughened 2-4 times stronger than ordinary glass (float/annealed glass) of the same thickness. This safety glass is a minimum requirement where building regulations demand health and safety considerations, including the distance from floor and doors.

6mm Toughened 2-4 times stronger than ordinary glass (float/annealed glass) of the same thickness, with enhanced sound insulation. This safety glass is a minimum requirement where building regulations demand health and safety considerations, including the distance from floor and doors. 

Obscure Toughened Patterned glass, used in bathroom windows where privacy is required, available in 4mm and 6mm thicknesses, and a range of finishes. 2-4 stronger than ordinary glass of the same thickness. 6mm has enhanced sound properties. This safety glass is a minimum requirement where building regulations demand health and safety considerations, including the distance from floor and doors. See download for options.

Satin Toughened Frosted effect glass. 2-4 times stronger than ordinary glass of the same thickness. This safety glass is a minimum requirement where building regulations demand health and safety considerations, including the distance from floor and doors.

Low E (emissivity) toughened Glass With special thin-film metallic or oxide coating allowing short-wavelength solar energy to be transmitted into a building, but preventing long-wavelength energy of the heating systems within a building from escaping; so conserving heat. 2-4 times stronger than ordinary glass. This safety glass is a minimum requirement where building regulations demand health and safety considerations, including the distance from floor and doors. See download for options.

Low E (emissivity) toughened Glass With special thin-film metallic or oxide coating allowing short-wavelength solar energy to be transmitted into a building, but preventing long-wavelength energy of the heating systems within a building from escaping; so conserving heat. 2-4 times stronger than ordinary glass. This safety glass is a minimum requirement where building regulations demand health and safety considerations, including the distance from floor and doors. See download for options.

6.4mm Clear Laminate 2 sheets of 3mm plate glass with a sheet of 0.4mm transparent PolyVinyl Butyral between. Moulded together under heat and pressure. The glass will crack without shattering. Also known as shatterproof glass.This thickness is considered a Class B safety glass. Enhanced sound proofing properties.  

6.8mm Clear Laminate 2 sheets of 3mm plate glass with a sheet of 0.8mm transparent PolyVinyl Butyral between. Moulded together under heat and pressure. The glass will crack without shattering. Also known as shatterproof glass.This thickness is considered to be a Class A safety glass. Enhanced sound proofing properties.

6.4mm Stadip Silence Specially developed acoustic glass comprising an interlayer which acts as a dampening core to prevent sound frequencies from vibrating from one pane of glass to the other. This absorbs and weakens sound energy, helping to act as a barrier to noise. This plastic interlayer also has the additional safety and security properties of laminated glass. This thickness is considered a Class B safety glass. See download for options.

Stadip Silence acoustic glass offers optimum sound reduction performance. However, it is a premium product and priced accordingly. Please note that with an air-gap of 150mm-200mm between primary and secondary glass, similar sound proofing performance can be achieved using a 6mm glass without the added expense.

6.8mm Stadip Silence Specially developed acoustic glass comprises of an interlayer which acts as a dampening core to prevent sound frequencies from vibrating from one pane of glass to the other. This absorbs and weakens sound energy, helping to act as a barrier to noise. The slightly thicker structure does not give an overall enhancement to sound proofing when compared to 6.4mm Stadip in general terms, but does have a slightly high performance on high frequency sound waves. This plastic interlayer also has the additional safety and security properties of laminated glass. This thickness is considered a Class A safety glass. See download for options.
Stadip Silence acoustic glass offers optimum sound reduction performance. However, it is a premium product and priced accordingly. Please note that with an air-gap of 150mm-200mm between primary and secondary glass, similar sound proofing performance can be achieved using a 6mm glass without the added expense.

Other glass options available on request

 

 

Obscure Glass Design Options

4mm Standard (A): Arctic, Autumn, Contora, Cotswold, Everglade, Flemish, Minster, Stippolyte (default), Sycamore.

Level 5 Arctic_CU

Arctic

Level 3 Autumn_CU

Autumn

Contora_CU

Contora

Level 5 Cotswold_CU

Cotswold

Level 5 Everglade

Everglade

Level 1 Flemish_CU

Flemish

Level 2 Minster_CU

Minster

Level 4 Stippolyte_CU

Stippolyte

Level-2-Sycamore_CU

Sycamore

4mm Extra cost (B) : Charcoal, Chantilly, Digital, Florielle, Mayflower, Oak, Pelerine, Reeded, Taffeta.

Charcoal_Sticks_CU

Charcoal

Chantilly_CU_2

Chantilly

Digital_CU

Digitial

Florielle_CU

Florielle

Mayflower_CU

Mayflower

Oak_CU

Oak

Pelerine_CU_2

Pelerine

Reeded_CU

Reeded

Level 3Taffeta_CU

Taffeta

6mm Only available in Autumn, Cotswold, Flemish, Stippolyte

Level 3 Autumn_CU

Autumn

Level 5 Cotswold_CU

Cotswold

Level 1 Flemish_CU

Flemish

Level 4 Stippolyte_CU

Stippolyte

Satin glass – frosted plain design only

Satin-Example

Satin

Help with Calculating Glass Weight

Below is the glass weight calculation formula, to help you choose the correct glass weight for your secondary glazing. See the size guide page and the download on this page, for minimum and maximum unit sizes for all products in Clearview’s Classic and Forte ranges.

Minimum and maximum suggested unit sizes >>

If you need any more assistance, email us with sizes of the required unit.

 Glass weight = 2.5kg/mm/m²

secondary-glazing-glass-options

GET A FREE QUOTE CALL 0114 294 5018
Get a QuoteContact UsShare on TwitterShare on Facebook