New Technology ultraclear
Self-cleaning Double
Glazed Units
Light Transmission
(Vision Clarity) 85%
Self-cleaning Double
Glazed Units
Light Transmission
(Vision Clarity) 75%
Currently nearly all double glazed units are
constructed with Low E glass (low emissivity) which
has a noticeable tint. Our new Ultra Clear Low E
Units reduce the visible tint effect and increases the
Daylight/ Solar Factor and in appropriate conditions
may reduce the heating energy requirement.
SlimLite Standard

0131 551 2931
Slimlite Double Glazed Units
Certification - U Values
Sound Reduction & U-Values
Timber Windows
Sash & Case
Reproduction Crown Glass
Construction Guide

Further Information
Emissivity Glass
Glazing Method
Self Cleaning Double Glazing
Warm Edge Technology
Insulation U-Value
Heat Loss - Timber Windows
Building Regulations
Standard Double Glazed Units
Kevin McCloud - Period Drama
Solar Factor
Breakdown or Misting
Inert Gases
Glazing Bar & Astragal Detail


Condensation - Double Glazed Units
Condensation in the main is caused by drop in temperature usually at night. During the day a room with a reasonably warm temperature will absorb moisture created mainly from the kitchen and bathroom.

Depending on the amount of moisture contained in the air, condensation will occur if there is a significant drop in temperature and the air reaches its dew point, which happens when the temperature drops and the air is unable to hold the moisture and deposits it on the coldest object first, normally the window glass.

Opening a window is the easiest way to clear morning condensation.

For instance the single glazing in a window will be approximately the same temperature as it is outside. If the room is heated with an outside zero or cold temperature this causes a constant convection where the warm air contacting the cold glass will drop from the window at approximately two metres per second, causing a constant heating versus cooling or continual heat loss which is expensive, apart from the noticeable draught.

Any Slimlite Ultra Clear Self Cleaning Double Glazed Unit will effectively slow down the dew point being reached if at all. The inner pane of the double glazed unit is always warmer than the outside pane in normal conditions, therefore the internal drop in temperature is considerably slower with the insulation of the double glazed unit. Increased insulation is the answer to reducing expensive heating costs.

Condensation is the enemy of timber windows and continual condensation over the winter can seriously deteriorate the lower sections of a timber window reflected in the huge industry of replacing rotten cills, bottom sash rails and cases. If constant heating is maintained condensation should not occur unless extreme conditions occur.

Ventilation will significantly reduce high air moisture content and therefore reduce condensation. A balance between heating and ventilation is considered to be the best situation.

Anti Condensation Glass

This is a speciality Pilkington Glass for the external pane of a double glazed unit, which will delay or prevent condensation appearing on the outside face of a double glazed unit. This phenomena can occur in the Autumn or Spring when the external air is warm and drops in temperature and reaches the dew point which can cause condensation to appear on the colder outside pane of the unit.

The anti condensation glass keeps the outside face or glass of the unit warmer, which will delay or prevent the condensation appearing.