1. Sheet Weathering Lead sheet Step flashings Feature tops
Ornamental roof tops
Roof canopies and bay tops
Flat roofs
Side cladding
Parapet gutters
From Plumbing (3rd edition), R.D. Treloar, page 353
Copyright Blackwell Publishing Ltd, all rights reserved:
Lead sheet

2. Sheet Weathering Bossed corner
Picture shows the excess lead that has been worked
up as the corner was moulded and bossed
From Plumbing (3rd edition), R.D. Treloar, page 354
Copyright Blackwell Publishing Ltd, all rights reserved:

3. Sheet Weathering Lead bossing Internal corner External corner
surplus lead cut off
‘setting in the corner’
blows directed into the
base of the corner
crease line
lead dummy
to give support
bossing
stick
bossing
mallet
pull up sides to
the required angle
boss
lead
in and up
finished
detail
surplus lead
trimmed off
stiffening
crease
bossing mallet
to give support
Internal corner
lead bossed
round corner
surplus lead
cut off
bend lead to
the required angle
drip plate
finished detail
lead bossed
into new corner
External corner
From Plumbing (3rd edition), R.D. Treloar, page 355
Copyright Blackwell Publishing Ltd, all rights reserved:
Lead bossing

4. Sheet Weathering Sheet fixing secret tack welded dot lead dot
wedge
20–25 mm
300–500 mm
cover
flashing
clip hooked over top of
batten; alternatively the
clip can be screwed to
the wall face
3 layer
roof felt
continuous fixing
clip at drip edge
welded cover patch
plumbers
black
tack welded to
back of sheet
solder
lead
secret tack
dot mould
alternative fixing
clip to above
welded dot
lead dot
soldered dot
From Plumbing (3rd edition), R.D. Treloar, page 357
Copyright Blackwell Publishing Ltd, all rights reserved:
Sheet fixing

5. Sheet Weathering Lead roof coverings and wall cladding
Example maximum bay size
for code 6 lead, as illustrated
would be:
2.25 x = 1.5 m2
50 mm
25 mm
2.25 m
0.6 m
150 mm
code 6
1/3 length
of bay
0.675 m
Bay detail of flat roof
2.0 m
lead weathering
junction
timber support
fixing
bracket
plywood
backing
panel
1/3 max
galvanised or
stainless steel bar
lead weld
at corners
Preformed cladding
Lead roof coverings and wall cladding
From Plumbing (3rd edition), R.D. Treloar, page 359
Copyright Blackwell Publishing Ltd, all rights reserved:

6. Sheet Weathering Expansion joints for lead roofs lead drip up
45 mm
drip
40 mm
45 mm
25 mm
standard
size drip
wood
cored roll
55–60 mm
splash lap
overcloak
roll
incorporating
additional clip
thus omitting the
splash lap
25 mm
75 mm
50 mm
lead drip up
to 3°
hollow roll
used on pitched roofs
undercloak
75 mm
vertical
cover
nail heads sealed
with lead welded dots
lap
35 mm
25 mm
standing seam
75 mm
welt
fixing clip
lead drip
3–10°
Expansion joints for lead roofs
From Plumbing (3rd edition), R.D. Treloar, page 361
Copyright Blackwell Publishing Ltd, all rights reserved:

7. step and cover flashing Abutment flashings in lead
Sheet Weathering
lead wedge
100–150 mm
soaker
fixing
clip
75 mm
25 mm
100 mm
cover flashing
450 mm
75 mm
min
1.5 m
25 mm
150 mm
min
75 mm
1.5 m
max
150 mm
apron flashing
25 mm
continuous
step flashing
and soakers
offcut
setting out of
steps to stepped
flashing
85 mm
150–200 mm
step and cover flashing
water line
65 mm
From Plumbing (3rd edition), R.D. Treloar, page 363
Copyright Blackwell Publishing Ltd, all rights reserved:
Abutment flashings in lead

8. Sheet Weathering Chimney flashings
From Plumbing (3rd edition), R.D. Treloar, page 364
Copyright Blackwell Publishing Ltd, all rights reserved:

9. Sheet Weathering Chimney flashings in lead Lead welded back gutter
cover flashing
saddle piece
(for use where the
chimney passes
through the ridge)
back gutter
tilting fillet
gutter sole
soakers
lead welds
Lead welded back gutter
cut
lines
step
flashing
front apron
fold
lines
gussets
150 mm
gusset
45°
150 mm
width of
stack
200–250 mm
width of
stack
25 mm (turn in at
brick joint)
150 mm
150 mm sole
Lead welded front apron
100 mm
upstand
150 mm
100–150 mm
roof pitch
150–200 mm
From Plumbing (3rd edition), R.D. Treloar, page 365
Copyright Blackwell Publishing Ltd, all rights reserved:
Chimney flashings in lead

10. Sheet Weathering Lead slates and pitched gutters lead slate
collar
solvent welded
to pipe
vent pipe
flat butt weld
roof
pitch
150 mm
flange
slate in
position
150 mm
lead slate
overflow
pipe
150 mm
150 mm
saddle
valley
lead sleeve
75 mm
Lead welded slate
tilting
fillet
225 mm
150 mm
pitched valley
gutter
Lead slates and pitched gutters
From Plumbing (3rd edition), R.D. Treloar, page 367
Copyright Blackwell Publishing Ltd, all rights reserved:
150 mm
min
eaves

11. Sheet Weathering Gutter linings Drip design Box gutter Tapered gutter
code 5 lead
2 m
2 m
2 m
sole of gutter
gets
progressively
wider
code 8 lead
3 m
pitched roof
3 m
Drip design
by using thicker lead, longer
bays can be achieved
gutter
sole
Box gutter
100 mm
cover flashing
Tapered gutter
chute
catchpit
hopper
overflow
downpipe
Gutter linings
From Plumbing (3rd edition), R.D. Treloar, page 369
Copyright Blackwell Publishing Ltd, all rights reserved:

12. Sheet Weathering Dormer windows Lead covered dormer windows dormer top
welted vertical joint incorporating
fixing clip
return welt
soaker
weathering
bead
side
cheek
tray and apron
flashing
Lead covered dormer windows
From Plumbing (3rd edition), R.D. Treloar, page 371
Copyright Blackwell Publishing Ltd, all rights reserved:
Dormer windows

13. Sheet Weathering Aluminium and copper sheet weathering
9 mm
16 mm
32 mm
8 mm
Single lock welt
14 mm
45-50 mm
32 mm
22 mm
fixing
clip
Double lock welt
Batten roll
overcloak
45 mm
undercloak
38 mm
32 mm
25 mm
Standing seam
50–65 mm
Vertical drip
Dog ear corner
Aluminium and copper sheet weathering
From Plumbing (3rd edition), R.D. Treloar, page 373
Copyright Blackwell Publishing Ltd, all rights reserved: