Is Triple Glazing Better Than Double Glazing?

Is Triple Glazing Better Than Double Glazing?

A better question is which of these two very different options is the better product for you and your property? Nowadays, although they do cost more, triple glazed UPVC windows, residential doors and French doors are not massively more expensive than double glazed products, but nevertheless do cost a fair bit more. The extra up-front investment aside, properly installed UPVC triple glazing offers unrivalled value for money when household energy savings are taken into account over a 20 year period.

There are some genuine pros and cons to consider when comparing double and triple glazing. Triple glazing obviously has an extra pane of glass, so each triple glazed sealed unit is thicker and heavier than double glazing, putting more strain over time on window hinges. So not only does the extra glass cost at least 50% more, each window and/or door costs more to transport as is much heavier.

Top quality UPVC triple glazing should have a combined U-value of around 1.0 W/m²k, and is usually around 40% more thermally efficient that standard “A” rated double glazing and 60% more thermally efficient than standard “C” rated double glazing. This is a massive potential beneficial energy saving for home owners, bearing in mind that between gas and electricity prices seem to shoot up more and more every year.

The extra investment cost of triple glazing as opposed to double glazing has to be weighed up. Some pros of choosing triple glazing:

  • Triple glazing is approximately 40% more thermally efficient than “A” rated UPVC double glazing so energy savings are far higher.
  • Triple glazed windows and doors will further reduce draughts and cold spots in a room that currently has less thermally efficient windows and doors.
  • Triple glazed windows and doors can reduce the impact of exterior noise.
  • A third pane of glass, by definition, makes a triple glazed sealed unit much harder to break than a double glazed sealed unit – especially when the middle pane is made of toughened glass. What’s more, all Hazlemere’s “A++” rated UPVC triple glazed windows are internally beaded and the glass unit can only be removed from the frame by a person who is inside the premises.

Some cons of going for A++ triple glazing as opposed to A+ double glazing:

  • Triple glazing costs more at the outset.
  • Triple glazing sealed units tend to break down more often than double glazed sealed units.
  • Triple glazed sealed units cost more to replace than double glazed sealed units once out of guarantee, something worth thinking about.
  • Triple glazing is only about 2 decibels quitter than double glazing, and if there are trickle vents required in the windows, there is no real difference.
  • The extra weight of triple glazing puts more strain on the frames, hinges and opening window and door sashes.
  • If the middle pane of a triple glazed sealed unit is float glass, this middle pane can be prone to cracking due to the temperature differences between inner and outer panes, so better installers will always use toughened safety glass to reduce the chances of this occurring.

The vast majority of UK home owners end up opting for double glazed windows and doors instead of triple glazing, so their actions are a strong indication that they believe double glazing offers them the best value for money and less to go wrong!

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