How do I deal with a high water table when building a patio in Ottawa?

Question

Accepted Answer

A high water table is one of the more serious site challenges you can face when building a patio in Ottawa, and it requires a fundamentally different approach than a standard installation on well-drained soil. Ignoring it and proceeding with a conventional base will almost certainly result in a patio that heaves, settles unevenly, and deteriorates rapidly — often within the first two or three winters.

Understanding the Problem in Ottawa's Context

Ottawa's geology makes water table issues more

Drainage & Grading

How do I deal with a high water table when building a patio in Ottawa?