Patio separating from the rest of your house is cause for an investigation. Is the patio separating from the house, or is the house moving away from the foundation?
A Granite Foundation Repair evaluator will look at both sides of the problem. What is moving and what is stationary? Most likely the separation of the two structures is occurring because one of them is moving down a slope.
Two common effects of slope failure are:
- A hillside is slowly moving. Sometimes the base slides out away from the hill.
- A retainer wall is moving and the soil behind it is sliding.
Retainer wall movement can be slow, or sudden. The picture below is an example of sudden retainer wall failure that led to slope failure under the patio, exposing plumbing. Left unattended, the whole house would soon fall.