Standard gutters come in pre-set 10-foot lengths, which are cut to size for your roof and then attached. The seams between each length must be sealed, which creates many weak spots where leaks can occur. Seamless gutters don't have as many seams, making them a more effective and lower maintenance option. 

1. Eaves Measurement

Your installer will begin by measuring the eave length where the gutters will be installed. This measuring is usually done along the underside of the eaves, as this provides a more accurate measurement. Corners along with downspout locations are noted for each side of the roof so that these measurements can be transferred to the guttering during construction.

2. Trough Shaping

Gutters are custom formed onsite, using a machine your installer will have in their work van. First, the location of any cutouts for the downspouts are noted and the downspout outlets are cut. Long lengths of metal, usually aluminum or galvanized steel, are then formed to the gutter shape in the machine and then cut to the pre-measured length for each roof edge.

3. Gutter Hanging

Hanging the gutters is an art in itself. Guttering must be lined up properly under the roof eaves so that water flows into the trough, not over either edge. Gutters must also be hung on a grade that slopes down toward the nearest downspout; otherwise, water will simply pool inside a level gutter. Your installer will carefully measure the slope and alignment of the gutters, and then adjust the hardware as needed to make sure the troughs are installed properly for drainage.

4. Downspout Attachment

Downspouts are attached to the pre-cut holes in the guttering. Around the downspout is the main area where a seam is used on seamless gutters, as a silicone sealant must be applied so that the gutters don't leak around the downspout outlet. If the gutters do not end right after a corner downspout, then a corner piece may need to be installed to connect the next seamless length as it rounds the corner. Sealing of this piece will also be done at this time.

5. Accessories Install

If you opt for accessories, they will likely be stalled at the very end of the process. Gutter guards, which keep leaves and debris out of the gutter, pair well with seamless gutters to make gutter maintenance easier. Folding downspouts that lift out of the yard for mowing are another gutter accessory you may want to add on during installation. 

Contact a seamless gutter installation contractor to learn more about the process.