TECHNICAL LIBRARY
GLASS
SIZE LIMITS
MAX SIZE for 4mm GLASS
If glass exceeds 1300mm in both directions or one side exceeds 3000mm or the area is greater than 2.5m² then 6mm glass must be used.
MAX SIZE for 6mm GLASS
6mm glass can generally be used upto 4m sq or upto 120kg but this would need to be checked by the glass supplier.
MAX SIZE for PATTERNED GLASS
Max size for patterned glass is:-
1320mm wide x 2140mm high
SATIN glass is the only exception. This is limited by the same maximum sizes for 4mm glass.
TOUGHENED GLASS
WHERE TO USE TOUGHENED GLASS
-
In doors where it's within 1500mm of the floor level.
-
Next to doors where it's within 300mm of the edge of a door and within 1500mm of the floor level.
-
Glazing which is within 800mm of the floor level.
-
It's also recommended if it's within 800mm of a fixed structure that is above floor level (e.g. Window seat or bath)
Below is a visual guide to the areas requiring toughened.
(Laminate glass can also be used instead of toughened)
OTHER TOUGHENED REQUIREMENTS
Shaped units and units with holes (e.g. for extractor fans and cat flaps) should also be toughened.
This is not regulatory but a requirement by many sealed unit manufacturers to prevent the unit from breaking.
PATTERNED GLASS
GLASS WEIGHTS
SINGLE GLAZING
4mm Glass - 10 kg/m²
6mm Glass - 15 kg/m²
6.8mm Glass - 16 kg/m²
DOUBLE GLAZING
4mm + 4mm Unit - 20 kg/m²
4mm + 6mm Unit - 25 kg/m²
4mm + 6.8mm Unit - 26 kg/m²
6mm + 6mm Unit - 30 kg/m²
6mm + 6.8mm Unit - 31 kg/m²
TRIPLE GLAZING
4mm + 4mm + 4mm Unit - 30 kg/m²
4mm + 4mm + 6mm Unit - 35 kg/m²
6mm + 6mm + 6mm Unit - 45 kg/m²
THE MAXIMUM UNIT WEIGHT A 2 MAN TEAM CAN SAFELY HANDLE IS 75 kg
SOLAR CONTROL
Solar Control glass used in conservatory roofs in not suitable for use in windows and doors because the Easy Clean coating on the external surface can get damaged when cleaning the glass.
Solar Control glass without the Easy Clean must be used for windows and doors.
COOL-LITE 176 is a suitable solar control glass.