In your average house the windows and doors will have U Values which are 2 to 3 times worse than an uninsulated wall and single glazed windows have a U Value, sometimes as bad as 6.0W/M2/K.  If we then go to the trouble of insulating the walls to a U Value of 0.2W/M2/K and don’t address the windows and doors then the heat loss through your typical double glazing will be 10 to 15 times greater per M2 (2.0 to 3.0W/M2/K).  The very best window and door U Values that are available today go as low as 0.5W/M2/K but the cost of purchasing them is prohibitively expensive and therefore we set ourselves a standard of only fitting windows and doors which had a U Value less than 1.0W/M2/K but typically we achieved just less than 0.8W/M2/K.  Although these products are still more expensive than the average products, they are much more affordable than the very best ones.  It is also worth noting at this point that even with U Values as low as 0.8W/M2/K the heat loss would still be nearly 4 times greater than the heat loss through a well insulated wall.


If you are considering an energy up-grade of your home or business premises, why not call FloElen Construction on 087 7542450 and we will be delighted to call out to discuss your plans.  Our expert team provides a full service beginning with a free energy consultation, a full planning service and a team of very experienced construction professionals dedicated to completing your project to the highest standards.  We are an SEAI/NSAI registered contractor for all grant schemes and we guarantee a very a competitive quotation for your works.

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