 |
 |
 |
 |
|
LEAD SHEETING & FLASHING. |
|
| CLICK HERE. | To visit the "Lead Flashing Theory Weights Chart" |
| CLICK HERE | . To visit "Lead Flashing Examples and Accessories". |
| CLICK HERE | To visit the page on " Lead Sheet Sealant". |
| CLICK HERE. | To visit the page on "Lead Patination Oil". |
|
Lead Sheet selection for Building Applications Lead sheet is manufactured to match the range of weights set out in BS EN 125888 199. It must be installed in accordance with the established industry practice, and in conformity with the current British Standard on the design and construction of fully supported lead sheet roof and wall coverings and the relevant sections of the BS code of practice for slating and tiling RECOMMENDED WEIGHTS FOR VARIOUS BUILDING APPLICATIONS |
| CODE | 3 | 4 | 5 | 6 | 7 | 8 |
| Nominal Thickness (mm) | 1.32 | 1.80 | 2.24 | 2.65 | 3.15 | 3.55 |
| Nominal Weight (Kg/m2 | 15.0 | 20.4 | 25.4 | 30.1 | 35.7 | 40.3 |
|
APPLICATION |
||||||
| Flat roofing/Pitched roofs | 4 | 5 | 6 | 7 | 8 | |
| Vertical cladding | 4 | 5 | ||||
| Soakers | 3 | 4 | ||||
| Parapet, box and tapered valley gutters | 6 | 7 | 8 | |||
| Hip and ridge flashings / Pitched valley gutters | ||||||
| Chimney flashings . Weatherings to parapets etc | 4 | 5 | ||||
| Apron and cover flashings | 4 | 5 | ||||
|
FLAT ROOFS. Up to 10% pitch |
||||||
| CODE | 4 | 5 | 6 | 7 | 8 | |
| Maximum spacing of joints with the fall | 500mm | 600mm | 675mm | 675mm | 750mm | |
| Maximum distance between drips | 1.5m | 2.0m | 2.25m | 2.5m | 3.0m | |
|
NOTE: a basic principle of all sheet leadwork is the thinner the sheet the smaller the piece: so the maximum dimensions shown here must not be exceeded. However, where the length of a bay is less than the permitted maximum, the width can be adjusted to give a bay having the same overall area. Wood rolls allow for thermal movement and are positioned to limit the possibility of wind lift. In exposed situations, to avoid the risk of wind lift in storm conditions, the width of bays should not be increased beyond the recommended widths. Bay lengths must never be longer than the maximum lengths set out above. Ridges can form across over-long bays and these may cause fatigue cracking |
||||||
|
PITCH ROOFS. Over 10% and up to and including 60% |
||||||
| CODE | 4 | 5 | 6 | 7 | 8 | |
| Maximum spacing of joints with the fall | 500mm | 600mm | 675mm | 675mm | 750mm | |
| Maximum distance between laps | 1.5m | 2.0m | 2.25m | 2.4m | 2.5m | |
|
PITCH ROOFS. Over 60% and up to and including 80% |
||||||
| CODE | 4 | 5 | 6 | 7 | 8 | |
| Maximum spacing of joints with the fall | 500mm | 600mm | 675mm | 675mm | 750mm | |
| Maximum distance between laps | 1.5m | 2.0m | 2.25m | 2.25 | 2.25m | |
|
CLADDING |
||||||
| CODE | 4 | 5 | 6 | 7 | 8 | |
| Maximum spacing of joints with the fall | 500mm | 600mm | 600mm | 650mm | 700mm | |
| Maximum distance between laps | 1.5m | 2.0m | 2.0m | 2.25 | 2.25m | |
|
GUTTER LINING |
||||||
| CODE | 4 | 5 | 6 | 7 | 8 | |
| Maximum spacing of joints with the fall | 55mm | 55mm | 55mm | 60mm | 60mm | |
| Maximum distance between laps | 1.5m | 2.0m | 2.25m | 2.5 | 3.00m | |
| Maximum overall girth | 750mm | 800mm | 850mm | 900mm | 1.0m | |
|
FLASHINGS AND SOAKERS. |
||||||
| CODE | 3 | 4 | 5 | 6 | 7 | 8 |
| Application | Soakers | Flashings | Flashings | |||
| Maximum length of piece | 1.0m | 1.5m | 1.5m | |||
|
Note: To avoid thermal expansion / contraction problems with flashings, due to temperature changes, regular spaced expansion joints must be provided. These joints are easily achieved by ensuring that individual flashing pieces do not exceed 1.5 metres in length. |
||||||
|
|
|
|
|
Copyright (c)1999 SLE Cladding Limited.