Alderman Roofing Lead Valleys
Alderman Roofing recommend that lead for valleys and gulleys should be at least Code 5. All leadwork to these areas are carried out under strict LSA guidelines, as the main cause for lead failure here is incorrect installation using Code 4 lead cut into large sheets, which makes the job quicker for the contractor but ultimately leaves the client with an inadequate valley or gulley.
Alderman Roofing Pitched Valley - Key Dimensions
OPEN WIDTH
WITH UNBEDDED TILES OR SLATES
WITH BEDDED TILES
(mm)
Min. width of lead to line valley
(mm
Min. width of lead to line valley
(mm)
125
425
525
150
450
550
200
500
600
250
550
650
lead info | flashings | roofs | guidelines
The above picture shows a valley replaced in Code 6 lead without re-roofing the property.