Milled Lead Sheet ~ produced from refined lead to an initial
thickness of about 125 mm. Thereafter it is rolled and cut to
12.000 m lengths, 2.400 m wide into the following thicknesses and
categories:Other Dimensions ~ cut widths between 75 mm and 600 mm in coils.Density ~ approximately 11,325 kg/m^3.Application (colour marking) ~Green and yellow † soakers.Blue, red and black † flat roof covering in small, medium and large
areas respectively (see table on page 455).White and orange † lead lining to walls as protection from X-rays
or for sound insulation, but can be used for relatively large areas
of roof covering.BS 1178* BS EN 12588/standard Weight (kg/m^2 ) Colour
Code No. milled thickness (mm) BS EN/milled marking
3 1.25/1.32 14.17/14.97 Green- 1.50/1.59 17.00/18.03 Yellow
4 1.75/1.80 19.84/20.41 Blue
5 2.00/2.24 22.67/25.40 Red
6 2.50/2.65 28.34/30.05 Black
7 3.00/3.15 34.02/35.72 White
8 3.50/3.55 39.69/40.26 Orange
*BS 1178: Specification for milled sheet lead and strip for building
purposes. This BS has been superseded by BS EN 12588: Lead
and lead alloys. Rolled lead sheet for building purposes. The former
BS codes are replaced with lead sheet thicknesses between 1.25 and
3.50 millimetres. They are included here, as these codes remain
common industry reference. Codes originated before metrication
as the approximate weight of lead sheet in pounds per square foot
(lb/ft^2 ). eg. 3 lb/ft^2 became Code 3.Timber Flat Roof Coverings -- Lead Sheet Specification