2mm lead sheet 50mm high
wood cored
roll, 25mm
wide at base
25mm rebate
for lead nailed
every 100mm
anti-capillary groove
smooth surface decking
or decking plus underlay
overcloak
40mm splashlap
undercloak nailed
every 150mm to top
of roll
Typical provision of wood cored rolls
and drips † detail at junction
40mm splashlap
drip 55mm min.
45
Lead is a soft and malleable material. A skilled craftsman
(traditionally a plumber) can manipulate lead sheet with hand tools
originally made from dense timber such as boxwood, but now
produced from high-density polythene. This practice is known as
`bossing' the lead to the profiles shown. Alternatively, the lead
sheet can be cut and welded to shape.
Timber Flat Roof Coverings -- Lead Sheet Details