According to Currie, the best metal rainwater gear is cast aluminum or cast iron. “But ‘seamless’ aluminum systems fabricated on-site are also available,” he says.

“Cast-metal systems are jointed with gaskets [or seals], whereas seamless systems are usually riveted together with a gasket material in the joint to provide a good seal.” Like cast metal, plastic gutters also have seals.

While gutters fixed to fascia and the like are sealed, downpipes are not. “Downpipes are loose-fitted, with a spigot above [which joins it to the gutter] and sockets joining the sections below,” says Currie. “This allows the downpipes to be dismantled for removing blockages, such as leaves.”

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