Retrofit Double Glazing



MagicSeal uses established double glazing principles with our unique magnetic sealing system to achieve cost effective acoustic and thermal insulation for existing windows.
The insulation benefits of double glazing are widely recognised:

  • Heat transfer is significantly reduced, saving money on heating or cooling costs.
  • Reduces incidence of ‘cold spots’ and draughts providing greater home living comfort.
  • Condensation problems are greatly reduced saving time on morning mop ups and preventing the growth of unhealthy mould and mildew on windows and drapes.
  • Noise annoyance from external sources can be significantly reduced providing peaceful home living conditions.
  • MagicSeal Secondary Glazing is fabricated and manufactured from premium quality, UV stabilised acrylic sheet and high performance plastics.

MagicSeal Secondary Glazing is fitted to the inside of the existing window, and held in place using MagicSeal’s magnetic system. This system traps a layer of still air between the pane of glass and the MagicSeal Secondary Glazing. This trapped airspace will reduce the rate of convective heat loss, and also act as a baffle to reduce sound transmission.

MagicSeal can double glaze your existing windows for a fraction of the cost when compared with replacement double glazed windows, and will still provide you with the benefits of standard double glazing.
Replacing windows can be a messy and invasive process involving the removal of window frames, re-fitting of architraves and window furnishings. A MagicSeal installation involves the fitting of a discreet second skin to your existing window frames.



Understanding the mechanics and science behind noise penetration can be complex. Below are some acoustic basics to consider:

  • The human ear perceives a 10dB reduction in noise as a halving of the volume.
  • Noise consists of level, frequency and duration of a sound source.
  • A given ‘noise’ may comprise many different levels and frequencies of individual sounds.
  • Different materials (such as bricks, timber, glass etc) transmit noise differently – some materials are better at reducing the passage of certain frequencies, due to the different densities of each material.
  • Differing annoyance levels and sensitivities occur for different individuals.


So when does noise become annoying?

Many studies have been undertaken to answer this question. A common conclusion is that noise typically starts to annoy people in a day-to-day situation when the sound levels exceed 63 decibels for more than 10% of the time; this is approximately 6 minutes in the hour. When this 63 dB level is sustained for more than 10% of the time or if it rises over 68 decibels, the number of people who will report annoyance increases rapidly.

The level of noise that is considered annoying varies greatly depending on each situation. For example a level above 35dB would be considered ‘annoying’ in a bedroom at night.

It is important to remember MagicSeal is aiming to achieve a reduction in both the volume and the amount of time that sound is at an annoying level. Any significant reduction is a welcome reduction.

As mentioned a 10dB reduction in noise, can be perceived by the human ear as a halving of volume. So the question arises…“Will my room be only half as loud after MagicSeal is installed?” Sadly the answer is probably not, because there are other sources of noise infiltration, such as eaves, ceilings, floors, and even walls.

However the weakest point in any house’s armour is the noise entering through windows, and that’s where fitting MagicSeal acoustic insulation panels can result in significant noise reductions to your living environment.

Heating and Cooling Benefits

To better understand the process of window insulation the following thermodynamic principles are relevant:

  1. Convection is the movement of air circulation caused when warm air rises and cool denser air falls.
  2. The convection process is reduced when a narrow airspace is put between the two air movements. The narrow airspace increases the drag between rising and falling air. The net result is that the air falling down the window is not cooled to the same extent, as it would be if it came in direct contact with the cold external glass.
  1. Conduction is the process by which heat is directly transmitted through a material when there is a difference of temperature. Glass is a very good conductor of heat and hence cold.
  2. Warm air can ‘hold’ more moisture as water vapour than cold air can.
  3. Dew point is the temperature, at which a given parcel of air must be cooled down (at constant barometric pressure) for water vapour to condense into water droplets. Often referred to as dew or condensation.



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