What slope should a patio have for proper drainage?

A patio should have a minimum slope of 1/4 inch per linear foot (approximately a 2% grade) away from the house foundation. For smoother surfaces like stamped concrete, some contractors recommend 1/8 inch per foot as a minimum, though 1/4 inch is the safer standard for reliable water shedding.

How do you drain water from around an inground pool?

Inground pools typically use a combination of pool deck drains (channel drains or strip drains installed at the deck perimeter), proper deck slope directing water away from the pool and toward collection points, and a subsurface drainage system like a French drain around the pool's outer perimeter. The deck should slope away from the pool edge at a minimum of 1/4 inch per foot.

Can permeable pavers solve patio drainage problems?

Permeable pavers can significantly reduce surface runoff by allowing water to infiltrate through joints into a gravel base below. However, they are not a universal fix. They require a well-designed aggregate base, proper subgrade preparation, and soils with adequate permeability. In areas with heavy clay soils or high water tables, permeable pavers may still need supplemental underdrain systems.

Do I need a drain between my patio and house foundation?

If your patio slopes toward your house or if the junction between the patio and foundation creates a channel where water collects, a drain is strongly recommended. A channel drain or trench drain installed at the patio-foundation junction intercepts water before it can pool against the foundation wall, preventing moisture intrusion and structural damage.

How much does it cost to install patio drainage?

Basic patio drainage solutions like a single channel drain run $500–$1,500 installed. More comprehensive systems involving French drains, multiple catch basins, and underground piping typically cost $2,000–$6,000 depending on the length and complexity. Permeable paver installations cost $12–$30 per square foot, which is higher than conventional pavers but includes built-in drainage.

Why does water pool on my pool deck after rain?

Water pooling on a pool deck is usually caused by insufficient slope, settled or heaved deck sections that have created low spots, or clogged or undersized drains. Over time, concrete pool decks can also develop surface depressions from soil compaction underneath. A professional can identify low points using a level or laser and recommend re-grading, mudjacking, or adding supplemental drains.

Patio Drainage & Pool Deck Drainage: Complete Guide (2026)

Learn how to plan patio drainage and pool deck drainage around hardscaping. Expert guide covers slopes, drains, materials, and common mistakes to avoid.

By Low Point Labs

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