Miters are not needed, they are simply used to make installation much faster. However, mitering the actual ends of gutter lengths, and making them meet, creates a nicer looking miter, since instead of 3 visible seams, only one would exist. Most don't opt to miter the lengths of a gutter because it takes much longer, and if a mistake is made, it can effectively ruin a length of gutter.

Box Gutters | Custom Metal Gutter Systems

Q: What are the available lengths for box gutters?

Reverse Bead gutters are roll formed (5" and 6"), which means they are made from coil stock fed through a machine. This allows for essentially "infinite lengths". However, for shipping purposes, we only offer 10' and 20', unless picked up. 7" and 8" are manually formed, and available in 10' or 19.5'. Euro Bead gutters and Double Bead Gutters are manually formed as well, and available in 10' and 19.5'.

Q: What is the best material for box gutters?

The one that achieves the look you're going for. Soldered seams are better, and create a longer lasting system, especially in areas with lots of rain and snow. Those are, copper, lead coated copper, freedom gray and zinc. Galvanized and bonderized can be soldered but rust quicker than Galvalume metals.

Q: What size downspout should I use with my Box Gutter?

The typical, but not necessarily a rule, is to use 2x3 with 5", 3x4 with 6", 4x5 with 7", 4x6 or 5x5 with 8" and 5x6 or 6x6 with 10" wide box gutter.

Box Gutters

Heavy Duty Box Gutters

Choose from our extensive line of Box Gutters styles and accessories

Box Gutters get their name because of their shape. There are many different styles, and since box gutters are manually formed, standard profiles can be customized, and new profiles can be crated for special orders.

Commercial vs. Industrial vs. Residential

These are just labels/names. They refer to slightly different profiles. Whether you need a heavy-duty industrial gutter for a warehouse or a sleek residential box gutter for a modern home we have the perfect box gutter for you.

At K&M Sheet Metal and Gutter Supply, we offer our box gutters in 10′ and 20′ lengths.
Box gutters are offered in colored Kynar material (0.032″ aluminum and 24 gauge Galvalume steel), 24 gauge Galvalume plus, 0.027″ regular standard aluminum colors and in copper, lead coated copper and freedom gray in both 16 oz. and 20 oz. as well as galvanized steel and bonderized steel
Custom box gutters with different profiles are also available as special order.

We also offer custom lengths, colors and materials along with downspouts , elbows , hangers , end caps , outlets and any other gutter accessories needed.

Have a picture or drawing of something else you'd like for us to manufacture? Let us know. We may be able to custom manufacture it for you.
Just email us photos, drawings, material specs and K&M will let you know if it's something we can help you with.

Box Gutter Submittals & Technical Drawings

PDF - 5" A Style Commercial Box Gutter
PDF - 6" A Style Commercial Box Gutter
PDF - 7" A Style Commercial Box Gutter
PDF - 8" A Style Commercial Box Gutter
PDF - 10" A Style Commercial Box Gutter

PDF - 5" D Style Residential Box Gutter
PDF - 6" D Style Residential Box Gutter
PDF - 7" D Style Residential Box Gutter
PDF - 8" D Style Residential Box Gutter
PDF - 10" D Style Residential Box Gutter

PDF - 5" F Style Industrial Box Gutter
PDF - 6" F Style Industrial Box Gutter
PDF - 7" F Style Industrial Box Gutter
PDF - 8" F Style Industrial Box Gutter
PDF - 10" F Style Industrial Box Gutter

PDF - 5" Style U Box Gutter (U Shaped)
PDF - 6" Style U Box Gutter (U Shaped)
PDF - 7" Style U Box Gutter (U Shaped)
PDF - 8" Style U Box Gutter (U Shaped)
PDF - 10" Style U Box Gutter (U Shaped)

Color and Material Options

0.027" Aluminum Gutter Color Options

Black

Dark Bronze

Musket Brown

Royal Brown

Almond

Linen

Low Gloss White (30°)

High Gloss White (80°)

The most popular gutter colors in 0.027" aluminum are Dark Bronze and Low Gloss White
Click here for a full list of 0.027" aluminum colors

Pac Clad Standard 0.032" Kynar Aluminum and 24 Gauge Galvalume Steel Common Half Round Gutter Color Options

Black

Matte Black

Charcoal

Dark Bronze

Medium Bronze

Copper Penny

Almond

Bone White

The most popular half round gutter colors in Galvalume Steel and Aluminum Kynar are Black and Dark Bronze
Click here for a full list of Kynar metal colors

Common Material Options for Reverse Bead Gutters

Copper

Pre Patina Copper

Freedom Gray

Galvalume Plus

Lead Coated Copper

Zinc

Bonderized Steel: Also known as Paint Grip. Offered in 26 gauge G90. 24 gauge available as special order.
Copper is the most popular metal for chimney tops. It is offered in 16 oz. and 20 oz.
Freedom Gray (zinc / tin coated copper) is offered in 16 oz. and 20 oz.
Galvalume Plus is offered in 24 gauge.
Galvanized Steel: Offered in 26 gauge G90. 24 gauge available as special order.
Lead Coated Copper is offered in 16 oz. and 20 oz.
Stainless steel is offered in 24 gauge 304 2B.
Zinc is offered in 0.7 mm and 0.8 mm with a raw finish.

Other colors, materials and thickness may be available upon request. Colors displayed for reference only.
Please click here for a full selection of colors and materials offered.

Choosing the Right Material

Steel vs. Galvalume Plus vs. Aluminum vs. Copper vs. Zinc, so many choices!

Aluminum Gutters: The most cost effective all around best option. Normally offered in 0.027" thickness, which is an industry standard. It is also offered in 0.032" with Kynar colored materials, 0.040" and even thicker for custom applications. Lengths are put together via rivets / screws.
Galvalume Plus Gutters: A solid approach for looks and durability. Galvalume metals are more rigid than aluminum and can withstand more abuse while being highly resistant to rusting.
Galvalume/Steel Gutters: Same as above, offered in Kynar coated colors.
Galvanized Steel Gutters: A special order item. Galvanized does rust quicker than Galvalume, but lengths/miters/end caps can be soldered.
Bonderized Steel/Paint Grip Gutters: Galvanized material that's prepped for painting, for those customers looking for an specific color.
Copper Gutters: The classic choice. Although not the cheapest, copper gutters look great and allow for a much more robust gutter system. The main advantage of putting up a copper gutter system is that all joints can and should be soldered. This allows for a long lasting product/system that can withstand the most harsh environments. It is one of the most commonly used system in areas of heavy rain and snow.
Zinc Gutters: Offering the same advantages as copper, zinc also patinas is a less dramatic way than copper. It is a malleable metal that can also be soldered.
Freedom Gray Gutters: Zinc/Tin coated copper. Offer the same advantages as copper, in a silver-ish coating that develops a patina over time.
Lead Coated Copper: Lcc gutters are as effective as copper and freedom gray with the advantage of already having lead on them, which means that any soldered joins are much less visible. LCC is a copper based product with a coating of lead applied.

FAQs

What is the appeal of box gutters?

A more modern look.

Are Box Gutters better?

They can carry more than similar size half round gutters for example but are not necessarily better or worse in any way.

How do I join two pieces of gutter?

To put 2 lengths of gutter together, simply cut back the front bead / lip of one of the gutter lengths by 1" or more depending on your needs. Do the same for the hem in the back if present. Cut where needed to create tabs. Overlap the 2 lengths of the gutter and join them by soldering if possible, or with zip screws / rivets and sealer if not. Coupling pieces can be manufactured if needed. Keep in mind that using a coupling piece like a cover plate gives the appearance of 2 seams. Splice plates can also be manufactured. Unlike cover plates, these sit on the inside of the gutter, giving the appearance of one seam, like overlapping 2 gutter lengths. Both are special order items.

How are miters attached?

Same as attaching 2 lengths of gutter.

Are miters needed?

Miters aren’t essential, but they do make installation much faster. Mitering the ends of gutter lengths and joining them creates a cleaner look, with just one visible seam instead of three. However, most people skip mitering the gutter lengths because it takes more time and requires precise measurements, and a single mistake can potentially ruin an entire section.

What are the available lengths for box gutters?

Box gutters are manually formed in a sheet metal brake; we only offer 10' and 20' lengths.

What is the best material for box gutters?

Choose the option that matches the look you want. Soldered seams are more durable and create a longer-lasting system, especially in areas with heavy rain and snow. Materials like copper, lead-coated copper, freedom gray, and zinc work best. Galvanized and bonderized metals can also be soldered but tend to rust faster than Galvalume.

What size downspout should I use with my Box Gutter?

Typically, though not as a strict rule, you would use 2x3 with a 5" box gutter, 3x4 with 6", 4x5 with 7", 4x6 or 5x5 with 8", and 5x6 or 6x6 with a 10" wide box gutter.

How are Box Gutters measured?

By measuring the horizontal depth from the back vertical leg of the gutter to the outer edge of the nose.

K&M Sheet Metal offers nationwide shipping. We supply Box Gutters of all types and sizes to Contractors and Homeowners all over the country, as well as our local North Carolina Market (Raleigh, Charlotte, Durham).

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Box Gutters