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    Buyer's Guide

    How to Choose Window Glass

    The frame is what you see — the glass is what you feel. Here's how to spec glazing for warmth, quiet, safety and privacy on a room-by-room basis.

    1

    Low-E is the baseline

    Every modern window should have a low-emissivity (low-E) coating on one of the inner glass surfaces. It reflects long-wave heat back into the room in winter without reducing daylight. The coating adds a barely-visible tint. If a quote doesn't specify low-E, it's using outdated glazing units.

    2

    Solar-control glass for south-facing rooms

    South- and west-facing rooms benefit from solar-control glazing (Planitherm, SunGuard, Suncool). It reflects a portion of solar heat before it enters the room, cutting summer overheating in extensions and conservatories. The trade-off is a slight reduction in winter solar gain, so it's not worth specifying on north-facing windows.

    3

    Acoustic glazing for noisy locations

    Standard double glazing achieves 30–32 dB sound reduction. Acoustic glazing uses laminated inner panes with an acoustic PVB interlayer and asymmetric pane thicknesses (e.g. 6mm outer, 4mm inner) to reach 38–42 dB. On a main road or under a flight path, the difference is dramatic — worth specifying on bedrooms and living rooms.

    4

    Laminated glass for security and safety

    Building Regulations require toughened or laminated glass in any pane within 800mm of floor level (Approved Document K). Laminated glass is the better choice because it holds together when broken — a security benefit as well as a safety one. Specify it on ground-floor rear windows and any fully glazed doors.

    5

    Obscure glass for bathrooms and side elevations

    Obscure glazing patterns are rated 1 (least obscure) to 5 (fully obscure). Level 4 (Cotswold, Stippolyte) is the standard bathroom choice. Level 5 (Everglade, Warwick) is best for direct overlooking windows. Levels 1–3 give some texture without real privacy — decorative rather than functional.

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