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NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

The area of window, door and rooflight openings in a wall or roof is measured internally between reveals and from head to sill.

NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

Where a new dwelling incorporates a conservatory or similar highly glazed space which does not have thermal separation from the rest of the dwelling, it should be regarded as an integral part of the d

NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

Where a conservatory, constructed as part of a new dwelling, has thermal separation from the dwelling, the TER and DER for the dwelling may be calculated as if the conservatory is not present and the

NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

The U-values should be calculated using the methods and conventions given in BRE Report BR 443 Conventions for U-value calculations, and should be based on the whole unit (e.g. in the case of a window

NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

To reduce heat losses and help limit excessive heat gain, the limiting extent of external doors and glazed openings in a dwelling should be no greater than 25% of the floor area of the dwelling.

NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

The U-values for roof windows and rooflights given in this Technical Booklet are based on the U-value having been assessed with the roof window or rooflight in the vertical position. Where a unit has

NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

SAP 2009 Table 6e gives U-values for different window configurations that may be used in the absence of test data or calculated values.

NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

When seeking to limit solar gains consideration should be given to the provision of adequate levels of daylight. BS 8206-2 gives guidance on maintaining adequate levels of daylight. The Building Regul

NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

The term "controlled fitting" in relation to a window, roof window, rooflight or door means the unit as a whole (i.e. it includes the frame). Consequently, the replacement of a broken window pane is n

NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

The Window Energy Rating (WER) is given by the following equation – WER = 196.7 x {(1 – f) x gglass} – 68.5 x {U + (0.0165 x AL)} where – f is the frame factor (i.e. the percentage of the window obscu

NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

The following window rating bands define the window energy rating label – Band A WER ≥ 0 Band B 0 > WER ≥ -10 Band C -10 > WER ≥ -20 Band D -20 > WER ≥ -30 Band E -30 > WER ≥ -50 Band F -50 > WER ≥ -7

NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

As evidence of compliance, a WER declaration from a certification scheme that provides a quality assured process and supporting audit trail from calculating the performance of the window to installati

NI-wide·Technical Booklet F1 Conservation of Fuel and Power in Dwellings

Where a window is enlarged or a new window opening is created, the total area of windows, roof windows, rooflights and doors should not exceed 25% of the total floor area of the dwelling unless compen