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Monday, 06 December 2021 14:32

My Double Glazing Windows Notes

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Minimum Glazing Specs you should have

As standard, most double glazing should be supplied with argon cavity gas, at least 1 low-e coating and a warm edge spacer.

  • Warm Heat Bar
  • Coated Float Pane : Low E (emissivity) Glass / Pilkington K glass (is Low E Glass) / Planitherm (is Low E Glass)
  • Argon filled (krypton is better)

My Choice

  • Planitherm Confort Glass
    • Planitherm Comfort Glass is the best glass choice for most houses
    • OuterPane: 6.8mm STADIP SILENCE (2 sheets of glass with laminate in the middle)
    • Inner Pane: 4mm PLANITHERM TOTAL+ (like K glass, this is also called the floating pane)
    • Cavity: 16mm | Argon gas filled | Warm edge spacer (cavity might be a bit wider on 28mm cassette 28 - 6.8 - 4 = 17.2mm)
    • Comfort | Planitherm
    • Planitherm Glass Technical Specs (PDF)
  • Frame
    • Profile 22 - 5 baffles ???
    • Rehow - 3 baffles ???
  • Windows
    • Full 90 degree openers
  • Furniture
    • Brushed Chrome or Satin Finish ???

This is the research I have done to decide what new type of windows I should put in my house.

  • Sound Reduction
    • 4mm+6mm: Domestic windows are typically 4-6mm thick. It follows that the thicker the glass, the better the noise insulation but it is also important to note that different glass thicknesses reduce different noise frequencies. So, if your double-glazed unit has one pane of glass at 4mm thick and one at 6mm thick, this will reduce noise across a wider frequency range than if they were the same thickness.
  • Gases
    • Argon (Krypton is better for price)
  • Correct Spacing
    • To get the maximum benefit from your double glazing, the gaps between the panes of glass should be 16mm and the gap between the two glass panes should be filled with argon gas, which adds another layer of heat insulation. If the gap is reduced then the thermal performance is reduced, unless you use a very expensive gas such as krypton.
    • In a 28mm cassette, triple glazing is worse than double glazing because the minimum gap between the panes is violated.
  • Triple Glazing:
    • is only really needed in extreme conditions.
    • is best in a 32mm cassette
    • is a lot more expensive

Triple Glazing Vs Double Glazing

  • Triple Glazing v Double Glazing – Regency Glass
    • The key to the differences in performance between double and triple glazing is the selection of glass types, cavity widths, gas filling and overall unit thickness.
    • Most double glazing in the UK consists of : 4mm clear glass / 20mm cavity / 4mm low e glass
    • This makes the overall unit thickness 28mm and this is pretty much standard for all UK uPVC window manufacturers and tends to mean that most manufacturers will put a triple glazed unit into this 28mm space. Depending how the glazing is made up, the window could actually have worse energy saving properties with a TGU than with the DGU it replaces:
    • Triple glazing in a 28mm cassette is worse than double glazing.
    • Triple glazing to be better has to be in a larger casssette such as a 36mm
  • Is bigger always better – triple better than double? - BRE Group
    • For years the domestic window market in the UK has developed on the premise that bigger is better. double glazing grew from an overall thickness of 20mm to 24mm and finally settled on 28mm even though thermally, with either air or argon cavities, 24mm is the optimum size. Frame depths grew from nominally 60mm to 70mm for no great technical improvement, just the misconception that bigger is better.
    • There are some technical thermal numbers here.
  • Triple Glazing - Is it really worth it?
    • Today’s standard double glazing units are generally 28mm in thickness with a configuration of 4-20-4mm, which represents, glass thickness, cavity depth and glass thickness.
    • As standard, most double glazing should be supplied with argon cavity gas, at least 1 low-e coating and a warm edge spacer.
    • Triple glazing is generally supplied with an overall thickness of 28 – 44mm.
    • A 28mm unit with 1 low-e coating will achieve a centre pane u-value of 1.3, in this configuration, triple glazing would not be more energy efficient than a double glazed unit.
    • If you are considering upgrading your new windows to triple glazing we would recommend a minimum overall unit thickness of 36mm (4-12-4-12-4) with 2 Low e coatings, Argon cavity gas and warm edge spaces used to join the glass panes together.
  • Triple glazing – Is it worth it? - TheGreenAge
  • Triple Glazing v Double Glazing – Regency Glass
    • Double Glazing versus Triple Glazing Is one really better than the other?Double glazing is better than single glazing: FACT Therefore triple glazing must be better than double glazing: FACT…..(well not always) The key to the differences in performance between double and triple glazing is the selection of glass types, cavity widths, gas

4mm / 6mm

  • Double Glazing thickness | Screfix
  • How Thick is Double Glazed Glass for Windows? [Full Guide]
    • You can also use thicker glass, which can achieve slightly better thermal insulation benefits and significantly improved acoustic benefits.
    • It’s possible to use two different glass thicknesses in one IGU, such as 6mm for the inner pane and 10mm for the outer pane. In fact, using varying thickness can be effective for blocking low frequencies of sound, like traffic noise.
    • How thick is the gap in a double glazing unit?
      • The space in between will usually range from 6mm to 20mm.
      • For greater energy efficiency, 10 to 20mm is a good idea, with at least 12mm being effective for both thermal and acoustic insulation concerns.
      • In situations where a bigger air gap is not able to be used due to frame thickness restrictions this is where a high performance Low E Glass and Argon Gas installed inside the IGU will pick up the performance of a thinner IGU helping it perform like a thicker air space.
  • Double Glazing Experts In Brighton | Top Notch Sash
    • Describes the different gasses: Argon, Krypton, Xenon
  • Best Practise Specifying for Noise Reduction | Secondary Glazing London
    • noise reduction is better with 6mm
  • Insulating Glass Units and Acoustics (pdf)(Dual Seal Glass)
    • Detail write up on how the glass can affect the sound
    • Cavity widths in the normal range of 6mm to 20mm, between the panes in double glazing units, provide similar performances, with no significant variation in sound reduction.
    • The inclusion of argon gas within the cavity of  an  insulating  glass  unit  will  exhibit  a similar  acoustic  performance  as  units  with the  same  glass  combination and air in the cavity.
    • To maximise the acoustic benefits, the laminated  pane  of  an  insulating  glass  unit may be glazed to the warmer side, usually inside of the building.
    • Triple  glazing  units  do  not  always  improve the noise reduction in comparison to double glazing, i.e. test data should be considered prior to selection of any glazing.
  • Window acoustics and noise control | BUILD
  • 24mm Double glazing... — MoneySavingExpert Forum
    • They can be made really narrow and maintain their thermal efficiency if they are krypton filled and made with low iron glass, and warm-edge spacers, and even lower-e glass - there are endless options.
    • If you want to improve accoustic insulation without shelling out for the fanciest glass or ugly secondary glazing then have the units made with different thickness panes of glass (say 4mm/14mm spacer/6mm for a 24mm unit), or with different materials (have one of the panes made with laminated glass, say) or both.
    • "My understanding of document L is that 16mm is considered the optimum air gap."
  • Why choose double glazing? | EW Grace Glass
    • Correct installation of good quality double glazing units can lead to a noticeable reduction in noise levels inside the home. There are two vital components to this, however: the thickness of the glass and the air gap between the glass.
    • Domestic windows are typically 4-6mm thick. It follows that the thicker the glass, the better the noise insulation but it is also important to note that different glass thicknesses reduce different noise frequencies. So, if your double-glazed unit has one pane of glass at 4mm thick and one at 6mm thick, this will reduce noise across a wider frequency range than if they were the same thickness.
    • To get the maximum benefit from your double glazing, the gaps between the panes of glass should be 16mm and the gap between the two glass panes should be filled with argon gas, which adds another layer of heat insulation. If the gap is reduced then the thermal performance is reduced, unless you use a very expensive gas such as krypton.

Different Types of Glass

General

Gas Types

Warm Edge / Warm Heat Bar

Suppliers

Double Glazing Trim

  • Profile 22 - 5 baffles
  • Rehow - 3 baffles
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Published in House
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