Double Glazing Repairs

NO Call Out Charge

Domestic and Commercial Work accepted
50 years of excellent customer service
We are your local experts
Free Quotations
All areas covered

We are a well-established family-run company that has built up and enviable reputation over the last 50 years.
We pride ourselves on our commitment to provide a professional and friendly service at all times, whilst maintaining the highest quality workmanship.
We undertake both domestic and commercial work. Your complete satisfaction is our aim.

Misted Double Glazed Units

Northfield Glass Centre can also replace a misted unit. If you are not sure that the degraded appearance of your window is a damaged or blown sealed unit then check our Misted Double Glazing Units page.

Replacement Sealed Units

Repair of a broken window by replacing the individual sealed unit is a lot less involved and disruptive that a replacement window installation as well as cheaper than replacing the complete window.

Northfield Glass are specialists in the repair of all broken windows due to accidents or crime at home and at commercial premises. We provide an emergency service and specialise in shop-fronts.

Our Quality Standards

Northfield Glass Centre fits replacement double glazed units manufactured to the highest quality and latest environmental standards. You will be delighted with the visual quality of your replacement sealed units.

Visual Quality

Transparent glass used in the manufacture of insulating glass units is identical to that used traditionally for single glass and will, therefore, have a similar level of quality.

Both panes of the sealed unit shall be viewed at right angles to the glass from the room side standing at a distance of not less than 2 metres but for toughened, laminated or coated glasses (not less than a distance of 3 metres) in natural daylight and not in direct sunlight with no visible moisture on the surface of the glass. The area to be viewed is the normal vision area with the exception of a 50mm wide band around the perimeter of the unit.

Flat transparent glass, including laminated or toughened (tempered) glass, shall be deemed acceptable if the following phenomena are neither obtrusive nor bunched:

• Totally enclosed seeds, bubbles or blisters; hairlines or blobs; fine scratches not more than 25mm long, minute embedded particles.
• Obtrusiveness of blemishes shall be judged by looking through the glass, not at it, under lighting conditions as described above.

When thermally toughened glass is viewed by reflection, the effect of the toughening process may be seen under certain lighting conditions. The visibility of surface colouration or patterns does not indicate deterioration in the physical performance of the toughened glass. Because of the nature of the toughening process, distortion will be accentuated when the glass is viewed in reflection or incorporated in insulating glass units.

Visible double reflection can occur under certain lighting aspect conditions, especially when viewed from an angle. This is an optical phenomenon arising from multiple surface reflections in sealed units.

The manufacture of flat laminated glass does not usually affect the visual quality of the glass incorporated in insulating glass units. However, the faults generally accepted above may be increased in number if several glasses and interlayers are used in the production of laminated glass. When viewed under certain light conditions, insulating glass units incorporating clear or tinted flat laminated glass may show a distortion effect caused by reflection on the multiple surfaces of the components of the laminated glass.

Brewster’s Fringes

The appearance of the optical phenomenon known as Brewster’s Fringes is not a defect of the glass, and can occur with any glass of high optical and surface quality. This phenomenon is a result of the high quality now being achieved worldwide by modern methods of glass manufacture. Brewster’s Fringes occur if wavelengths of light meet up with each other when they are exactly 180º out of phase – an example of the phenomenon known to physicists as the interference of light. The effect is similar to, although usually much smaller than, the interference fringes which can sometimes be seen on toughened glass windscreens. Brewsters’ Fringes occur when the surfaces of the glass are flat and the two panes of glass are parallel to each other, i.e. when the light transmission properties of the installation are of a very high order.

This phenomenon is not a defect of the product, being dependent on the laws of physics and not on the quality of the insulating glass. In fact it arises because modern glass made by the float process is flat, therefore, free of the distortion inherent in sheet glass. The occurrence of Brewster’s Fringes is in its nature rather like (though very much more rare than) the fact that under certain conditions, the observer will see a reflection of himself in any window or door – and no-one could claim that this was a defect of glass.

Note: Patterned Glass

The above criteria do not apply to patterned glass, as due to the method of manufacture, imperfections such as seeds and bubbles are deemed to be acceptable. Visual quality standard for installed insulating glass units constructed from flat transparent glass

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