Gutter Miters

Choose the Miter That Matches Your Gutter

Half-Round Miters: Reverse Bead and Euro Bead

Half-round gutters can have different bead shapes even when their nominal widths match. Select a miter for the exact gutter profile; a reverse-bead fitting should not be substituted for a traditional Euro-bead fitting without confirming compatibility.

K-Style Gutter Miters

K-style miters continue the gutter’s shaped front, flat bottom and back through a corner. Match the gutter size, inside or outside orientation, angle and material. A nominal size alone does not confirm fit with an unfamiliar manufacturer’s gutter profile.

K&M’s K-Style miters include 5-, 6-, 7- and 8-inch sizes, 16- or 20-ounce copper, and 45-degree, 90-degree and custom angles. The fabricated corner is tabbed and soldered. That factory-assembled joint is separate from the field connections to the straight gutter runs.

Selected Galvalume and painted-metal miters use mechanical assembly. The K-style Galvalume Plus listing states that the miter is not supplied pre-sealed, so plan to seal the applicable corner and connecting seams during installation.

Box Gutter and Custom-Profile Miters

Box gutters are a family of profiles rather than one universal shape. K&M lists miters for A-style commercial, D-style residential and F-style industrial box gutters. Match the named style as well as its dimensions; a residential box miter should not be assumed to fit an industrial box gutter of the same nominal width. We offer our box gutters in 5-, 6-, 7-, 8- and 10-inch sizes depending on the selected materials.  Check our product listings to verify sizes.

For Brownstone, custom ogee styles or other custom profiles, send a dimensioned cross-section and corner layout. Include the front and back heights, bottom width, bead or hem details, required angle and material. K&M can review whether the requested shape can be fabricated.

Inside vs. Outside Corners and Bay Angles

An outside miter is the projecting corner of a building and typically marks the beginning of a roofline hip. An inside miter follows a recessed corner, usually at the start of a roofline valley. Be sure to check the direction when assembling your order, and if you are unsure, refer to our product listing images to ensure you select the correct miter.

Our Standard product miter options include 90-degree and 45-degree corners, the latter commonly referred to as a bay miter. As bay-window rooflines can differ, it is important to get the actual degree rather than selecting a corner based solely on its nominal description.  K&M can custom fabricate any degree miters as a custom order.

Coordinate the Metal, Finish and Joint Method

Common options include copper, 0.027-inch painted aluminum, 0.032-inch Kynar-finished aluminum, and selected 24-gauge steel or Galvalume products. Coated copper, zinc and other materials depend on the product or custom request. One-piece copper miters may use a different copper weight from fabricated models.

Match the base metal and finish specification, not just the color name. A copper-colored painted miter is not copper metal. Compare samples when coordinating with an existing gutter because weathering and different coating systems can affect the match.

Stamped, riveted and soldered construction have different installation requirements. A tabbed or riveted fitting is not necessarily sealed, and a soldered factory corner does not complete its connections to the gutter runs.

Before You Order or Cut the Gutter

• Identify the profile: Include half-round bead style or the specific box gutter model.
• Confirm size: Compare the actual cross-section, particularly for replacement parts.
• Mark every corner: Record inside or outside orientation, angle and quantity.
• Check leg lengths: Use the selected drawing or request dimensions. Do not assume all miters have the same short-side length.
• Plan the joints: Allow for the specified overlap, fasteners, sealant or soldered connection.
• Check nearby components: Coordinate hangers, outlets, end caps and gutter guards.

Dry-fit the miter before cutting and fastening the adjoining runs. Support the gutter near the corner according to the hanger and project requirements. Use compatible sealing materials and check the completed connections for leaks.

For a custom quote, include the drawing, material and finish, quantities, delivery location and requested schedule. Confirm preparation time separately from shipping transit time.