Description Traditionally in applications such as lead lined gutters, lead sheet lengths are joined by overlapping them at drips that stand at least 50mm high. However, if the fall is suffifficient for this to be possible, a length of Lead Expansion Joint may be welded between the upper and lower sheets. A weather tight joint is thus effected that is sufficiently flexible to absorb the strains exerted by thermal expansion and contraction of the adjoining lead sheets.
