Seamless vs sectional eavestroughs: what's the difference?

Seamless eavestroughs are roll-formed on site from a coil of aluminum into one continuous piece per wall, so the only joints are at corners and end caps. Sectional gutters join standard lengths with slip joints every few metres. Fewer joints means fewer leaks, which is why seamless aluminum is the usual choice on GTA homes.

How are seamless eavestroughs made?

An installer brings a portable roll-forming machine to the house. A flat coil of pre-painted aluminum feeds through rollers that shape it into the gutter profile, usually 5- or 6-inch K-style, and the machine cuts it to the exact length of each wall. The run goes up in one piece, so the only joints are where runs meet at corners, where the downspout outlet is cut in, and at the end caps.

What are sectional gutters?

Sectional gutters come in standard lengths, commonly around three metres, in vinyl, aluminum or steel. They are joined on site with connectors or overlapping slip joints, each one sealed. They are the kind you can buy at a hardware store and install yourself, which is their main appeal.

How do they compare?

Why do joints matter so much?

Because that is where gutters leak. Every joint relies on sealant, and sealant has a hard life in Ontario: summer heat, UV, winter cold and the constant flexing as metal expands and contracts. Why gutters leak at the seams covers how and why those seals fail. A 12-metre wall on a sectional system carries several joints before you even reach the corners; the same wall in seamless has none.

Are vinyl sectional gutters OK in Ontario winters?

They work, with caveats. Vinyl can become brittle in deep cold, so a ladder leaned against it or a heavy ice load in January is more likely to crack it than it would aluminum. Vinyl also expands and contracts a lot with temperature, which stresses the joints. On a garage, shed or small addition it can be perfectly sensible; on the main house, most GTA homeowners choose seamless aluminum. Gutter materials compared goes deeper.

Which one is right for your house?

• Main roofline of a house you plan to keep: seamless aluminum, sized for the roof.
• Garage, shed or small addition: sectional can be fine, especially if you are installing it yourself.
• Matching an existing system for a short repair: whatever is already there, so profiles line up.
• Heavily treed lot: seamless with fewer joints, and consider 6-inch gutters or 3-by-4 downspouts.

How are seamless gutters repaired?

Most seamless repairs are the same as any gutter's: re-fastening hangers, resealing a corner, re-levelling a sag. Where a section is dented or crushed, the run can often be spliced with a matching piece, though the splice adds a joint. When a long run is badly damaged, it is usually replaced as a whole wall, formed again on site. Repair or replace lays out where that line sits.

What about Vaughan's long rooflines?

Vaughan's large two-storey detached homes, from Woodbridge to Vellore Village, often have long uninterrupted walls, which is where seamless shines. The longer the wall, the more joints a sectional system would need and the bigger the seamless advantage. Long aluminum runs do expand and contract noticeably between summer and winter, so good installs use hangers that let the gutter move slightly without working the end caps loose.

We clean and make minor repairs on both seamless and sectional systems; full replacement is a job for an eavestrough installer. Gutter repair in Vaughan covers refastening, resealing joints and re-levelling short runs, from $89, priced on site and approved by you before work starts.