Choose a suitable U-value
U-values might seem a pretty dull subject, however it is absolutely key to understand them so that you can insulate your home with the most appropriate material.
Thermal transmittance, also known as U-value, is the rate of transfer of heat through a structure (which can be a single material or a composite), divided by the difference in temperature across that structure. The units of measurement are W/m²K and indicates how much heat per unit of time that flows through an area of 1m² at a constant temperature difference of 1K (1°C) between warm and cold side of the structure. The better-insulated a structure is, the lower the U-value will be.
Both the glass and the frame are taken into consideration when calculating a product’s constructed U-value. We offer five U-values from 1.4 through to ‘Passive House’ compatible products in the low U-value of 0.7. Although a U value as low as 0.7 sounds very impressive, the additional energy saved is small. The key benefits are really to do with comfort. If the walls, roof and floor of a house are insulated, and the glazing ignored then there is a risk of cold spots surrounding the windows at night, which cause draughts, draw heat away, with resulting in the potential for condensation.
Choose a suitable U-value for your project by considering the overall energy efficiency of your home. A period property with little or no wall insulation is likely to leak more energy than a property built in the last 10 years, therefore, a U-value of 1.4 or 1.2 will be appropriate as the overall heat loss from the property can only be countered so far with energy efficient windows. Similarly, fitting 0.7 U-value windows in a standard new build project will cost up to 50% more but will only reduce overall house heat loss by around 5%.
Broxwood Windows & Doors product U-values
Standard, Broxwood’s entry level product, out performs the UK building standard requirement for new build projects.They are exceptional value and are suitable for new build and renovation projects.
|Our ThermaSave windows provide real savings and are ideal for new build or replacing windows in an older style property.|
|How well insulated is the rest of the building? Our ThermaPlus windows are suitable for replacing windows in a properly insulated property or for a new build project.|
|Broxwood’s technically advanced Ultra product is compatible for use in a Passive House project or a building where your overall intention is to be as carbon neutral as possible.|