Thermal Insulation

Granadas' Secondary Double Glazing products provide Excellent Thermal Insulation.

They are Suitable for Installation into Windows & Doors of all types in both Commercial & Residential Properties.


The Facts

Around 20% of a Homes Heat Loss is via Single Glazed Windows

http://www.gozero.org.uk/files/A_Guide_to_Home_Energy_Saving.pdf

Standard Double Glazing will about halve that heat loss

http://www.energysavingtrust.org.uk/home_improvements/home_insulation_glazing/glazing


The Figures

U Values Explained

Thermal transmittance is a measure of how much heat will pass through one square metre of a structure (door or window) when the air temperatures on either side differ by one degree.

This measurement is known as the U-value. The lower the U-value, the better the level of insulation, and vice versa.

• Domestic Dwellings - Under Building Regulations Part "L" Replacement Windows & Doors must have a U-value of 2.0 or less.
  
  
• Buildings Other than Dwellings - Under Building Regulations Part "L" Replacement Windows & Doors must have a U-value of 2.2 or less.

Typical U Values By Primary Window & Glazing Type

* U Value Range
The Range is determined by the Cavity Gap & the Type & Thickness of the Low E Glass Coating.
The bigger the gap the better up to approximately 13.2mm for Air Filled units after which air circulation within the Sealed Unit cancels out any gain from reduced conductivity.

Low E glass is available in Hard Coat & Soft Coat versions with different thickness coatings. Coating thickness makes a negligible difference to the Insulation Value - Soft Coat is more effective than Hard Coat but NB that it is less durable & quite easily damaged or marked during handling and processing.

This is the Current Standard for over 90% of the Replacement Windows being installed in the UK today.

Amongst other sources you will find a Table of U Values on the following Link, Page 65:

http://projects.bre.co.uk/SAP2005/pdf/SAP2005.pdf

The Solutions

Obviously you can fit Replacement Double Glazing, however, if your existing windows have not reached the end of their useful life but are Draughty & Inefficient, then Replacements are not the Most Economical or Environmentally Friendly Solution.

In this Scenario, Secondary Glazing will provide an Equally Effective solution, at less Cost to Both You & The Environment.

Standard Secondary Glazing using Float Glass over a typical primary window will achieve a U Value of about 2.5.

Granadas' Secondary Glazing with a 4mm Low E Hard Coat glass will achieve a U Value of 1.868 - equal to the majority of Replacement Double Glazing!

Please see the Independent Testing Report carried out by Interver Special Glass.



Change of Use (Building Regulations L1)

Granada can supply Rated Secondary Glazing that Complies with the Requirements for Change of Use.

For more Information or Specific Enquiries please call or Contact Us



Useful Links

• There are a few ways to improve the performance of old windows without going to the expense of double glazing. A simpler, cheaper alternative is to fit secondary glazing, which can be an additional window fitted on the inside of the existing frame
  http://www.cat.org.uk/information/catinfo.tmpl?command=search&db=catinfo.db&eqSKUdatarq=InfoSheet_Glazing
  
  
• Secondary glazing is much cheaper than full double-glazing and is the option to go for if you do not need to replace your current single glazed windows.
  http://www.kentenergycentre.org.uk/How_save/secondary_glazing.asp
  
  
• Find out what to think about when considering the installation of a secondary window
  http://www.portsmouth.gov.uk/living/737.html
  
  
• Secondary glazing is a cheaper alternative to replacement double-glazing but is nevertheless effective in reducing energy loss.
  http://www.burnley.gov.uk/site/scripts/documents_info.php?documentID=204&pageNumber=11
  
  
• If you're on a budget, fitting secondary glazing could be the answer. It's less expensive than replacement double-glazing and will still save money by cutting heat loss and draughts.
  http://www.ukenergy.co.uk/pages/double-glazing.html