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Differences between PVCu Bay & Bow Windows
PVCu bay windows
A PVCu bay window is generally one where the windows follow the shape of the supporting brickwork below and the space created by the curved or rectangular shape of the bay is part of the internal room. Curved bay windows, generally in five sections, were originally built on Victorian properties as a sign of wealth.
PVCu bay windows are normally replacements of original wooden bay windows and the use of round bay poles allows several individual windows to be fixed together to form the bay. One point for homeowners to be aware of is offers made by window companies for, say 5 windows for £????. A curved PVCu bay window with five sections will always count as five separate windows for the purposes of a quotation.
PVCu bow windows
A bow window or a plant-on bow window as it is properly referred to, projects beyond the external brickwork without being supported by it. A bow window generally provides a deep internal window sill whereas a bay window does not. PVCu bay windows are often conversions from original flat windows, where the householder has decided to convert a flat window into something more visually appealing. If a flat window is converted to a bow window, the width of the original flat window will normally determine the number of sections the new bow window will have.
A flat window at 1.8 metres wide would normally be converted into a three part bow window and a flat window at 2.4 metres wide would normally be converted into a four part bow window. When removing a flat window and installing a PVCu bay window it is important that the new roof and base of the bow window is properly insulated to conform with Building Regulations with regard to heat loss.
PVCu bay & bow windows – structural support
Curved and rectangular PVCu bay & bow windows have reinforced poles between each individual window for strength and support. A curved PVCu bay or bow window would normally have round bay poles between the sections and a square or rectangular PVCu bay or bow would have a square bay post on the corners.
FENSA and Building Regulations rules apply to all replacement windows but in the case of PVCu bay & bow windows additional rules apply to the structural support which they must be fitted with and the way in which old bays and bows are removed to be replaced with new PVCu bay & bow windows.
Square or rectangular PVCu bay & bow windows are usually in three sections but they also can be made up of just a front and one side; this is referred to as a dog-leg bay.