Measure roof perimeter for gutter length. Plan one downspout per 30-40 feet of gutter. Standard downspouts are 10 ft sections. 5 inch gutters standard, 6 inch for steep roofs or heavy rain. Slope 1/4 inch per 10 feet toward downspouts.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
One downspout per 30-40 feet of gutter for proper drainage.
5 inch standard for most homes. 6 inch for steep roofs or heavy rainfall areas.
Slope 1/4 inch per 10 feet toward downspouts for proper drainage.