Seamless Gutter Installation Standards
Slope, Mounting Practices, and Warranty Considerations
Purpose
1. Installation Hardware and Mounting Systems
2. Hanger Spacing Standards
- Maximum hanger spacing should not exceed 30 inches.
- 24-inch spacing is recommended in temperate regions.
- In heavy snow regions, hanger spacing should be reduced to 12-16 inches, or a continuous hanger system may be used.
Half-Round Hanger Considerations
- Decorative cradle hangers may be spaced according to architectural preference.
- Supplemental hidden brackets should be installed internally to maintain structural spacing below 30 inches.
3. Fastener Selection Standards
- Fastener Diameter - Fasteners should be #10 - #12.
- Fastener Lengths - length must be sufficient to penetrate the hanger, gutter material, and structural substrate.
- Bare steel and bright zinc fasteners should be avoided.
- Coated steel fasteners are generally appropriate for aluminum and steel installations.
- Stainless steel fasteners are recommended for copper systems. (Coated Screws may be used in some cases)
- Fasteners should be selected to avoid galvanic corrosion between dissimilar metals.
- An example of coated installation fasteners commonly used in the industry includes Ruspert-coated fasteners manufactured by Senox.
Seal Washer Considerations
4. Structural Substrate Considerations
Wedge and Bumper Supports
- T-wedges
- Gutter Bumpers
- Full-length E-wedges
5. Drip Edge Interface Standards
- penetrating drip edge with fasteners
- installing gutters behind the drip edge
Half-Round Counter-Flashing
6. Gutter Slope Standards
1 inch of fall per 100 feet of gutter run
or
¼ inch of fall per 25 feet
Practical Slope Calculation
Example:
(Fig.1)
7. Thermal Expansion and Span Limitations
- 50-foot maximum spans recommended by Senox
- 40-foot maximum spans recommended by Norandex
Our professional standards:
- Maximum 60' span lengths before expansion joint on .027 gutters.
- Maximum 80' span lengths before expansion joint on .032 gutters.
- Joint installation must allow for lateral movement with a minimal amount of restriction.
Version
V.1.0 03.07.26
(v.1.1 04.12.26 - addition of dcGutterPRO as Reviewer)