Building Construction Handbook, Eighth Edition

Spacing of wood cored rolls and drips varies with the thickness
specification of lead sheet. The following is a guide ~

Typical flat roof plan (page 417)

100mm min.

abutment upstand

to wall with

apron flashing

wood cored

roll

see previous

page

drip

verge

fascia downstand

into gutter

B

A

BS EN 12588

thickness (mm)

Maximum distance

between drips (mm) [A]

Maximum distance

between rolls (mm) [B]

1.25 and 1.50 Use for soakers only

1.75 1500 500

2.00 2000 600

2.50 2250 675

3.00 2500 675

3.50 3000 750

Timber Flat Roof Coverings -- Lead Sheet Application