Fountainbridge  Windows  Ltd

Unit 7, Forth Ind Estate, Sealcarr St, Granton, Edinburgh, EH5 1RF

Tel. 0131 551 2959    Fax. 0131 551 2947
Free Phone: 0800 316 6031



"Everything You Need To Know About Windows With Glass"

  Slimlite Double Glazed Units for Timber Sash &
Case and Casement Windows

Slimlite Double Glazed Units encompass the latest Warm Edge Technology, Low E Glass and
Insulating Inert Gasses.

They feature small perimeter seals and small cavities which can be fitted into most single glazing rebates.

Most importantly the low emmisivity glass and inert gas provides a very high insulation U Value of 2.00 or 1.6, depending on construction. As a guide, a U Value of 2.00 offers a 170% insulation improvement over single glazing and a U Value of 1.6 offers a 240% improvement. The thickness of glass has little or no effect on insulation values.

These units carry a Home Pro 10 Year Guarantee underwritten by Pinnacle plc who are members of the Association of British Insurers. The scheme is also authorised by the DTI.

Although originally designed for sash and case windows with
astragals, they will fit into any suitable single glazing window rebate.
Standard Cavity Widths  -  3.2mm  -  4mm  - 5mm - 6.5mm
Standard Seal Depth for all cavity widths  -  5mm
Minimum timber rebate depth  -  7mm
Minimum timber rebate width  -  19mm
The Advantages of Slimlite Double Glazed Units
They will Comply with Building Regulations Document J Scotland and Document L England for improved
thermal insulation.
The 5mm perimeter seal of Slimlite Double Glazed Units enables them to be glazed into 7mm deep glazing
The smaller cavities between the glass reduce the required glazing width rebates and enables slimmer
sections to be used.
They are the only double glazed units that can be glazed into most standard astragals.
They can be glazed into most existing single glazing glass rebates.
Crown Sheet Glass
This type of glass was manufactured in the early Nineteenth Century and was made by basically spinning
molten glass on the end of a rod to form a flattened circular shape which was cut into rectangles when cooled.
The glass varied in thickness from I to 2 millimetres and had the visual distortions evident today in many
windows in old buildings.
Reproduction Crown Sheet Single or Double Glazed
Whilst it is not possible to carry out the process mentioned today, we can produce a very similar product by
a heat process on any glass to effect similar distortions and bulges creating the visual appeal of the Old
Crown Glass. However, in addition to the Reproduction Crown Glass for single glazing, we have achieved a
first by manufacturing Reproduction Crown Glass with visual distortions and flat perimeter margins thereby
enabling Reproduction Crown Glass to be used in the construction of a Slimlite Double Glazed Unit. This
breakthrough now makes it possible to achieve the old world visual aspect to windows much preferred by
Heritage Associations but, most importantly, the double glazing helps to reduce Carbon Dioxide emissions.
Carbon Dioxide
Double Glazed Units constructed with Low E are often referred to as advanced double glazing because of their increased insulating effect and lowering effect of carbon dioxide emissions.

In 2005 published claims considered that the use of advanced Low E double glazing replacing single glazing will have a pay back time in investment of 3 years, and perhaps less considering the current increasing cost of energy.

There are recommendations being made to authorities to change the Building Regulations to ensure that Low E advanced double glazing is installed in new buildings and existing single glazing when being replaced to reduce emissions.

The replacement of one square metre of single glazing by one square metre of advanced Low E double glazing will provide a saving of approximately 90Kg per year of carbon dioxide emission.

The average small house single glazed with around 15m2 of glazing will save 1350 Kg of emissions per year, by installing Low E advanced double glazing or Slimlite.

There are thousands of listed buildings mostly single glazed in the UK today, where the amount of carbon dioxide emission is very substantial.

It is estimated that total emissions from residential buildings in the UK amount to 86 million tonnes
Single Glazing - Condensation - Double Glazing
Condensation is the enemy of timber windows and the main cause of astragal and bottom sash decay. The
warm air in a house during the day absorbs moisture from various sources, mainly in the kitchen and
bathroom. If the temperature in the house drops sufficiently during the night, the air can no longer hold the
moisture absorbed at the warmer temperatures, so deposits the surplus on the coldest surfaces - single
glazed windows which are practically the same temperature as the air outside.
Double glazing effectively has an inner pane which is warmer than the outer pane and therefore helps to
maintain the room temperature when the heating is switched off at night. The inner pane being warm but not
as warm as the walls, will still cause convection where air against the glass will flow downwards, but at a
much slower rate than a single glass thereby helping to reduce condensation and heat loss.
Single glazing in a house can only keep out the wind and rain, provide daylight and provide vision to the
outside. It has no insulation value, and is a major contribution to temperature drops when heating is not
maintained. Condensation is a fairly complex problem and apart from heating variables can be reduced by
ventilation and air changes, forced or natural.


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    © Fountainbridge Windows Ltd, 2008