Deck Assessment and Retaining Wall Strategy

What happens here

Before constructing the retaining wall, thoroughly inspect the adjacent deck for structural damage such as rot in the posts, and assess the foundation of the house. In Minnesota, any structure technically connected to a house requires frost footings. Since the existing deck posts are not confirmed to have frost footings and show signs of rot, the decision is made to build a freestanding 'gravity wall' that is not directly connected to the deck or house foundation, to avoid extensive and costly deck reconstruction and permitting complexities. A gravity wall is generally suitable for heights under 4 feet and conditions without significant 'surcharge' (additional weight or force from structures, hills, or temporary loads like parked cars) behind it, thus avoiding the need for geogrid or engineering. Measure the existing structure and plan for the placement of the gravity wall, ensuring a gap between the wall and the house foundation.

Goal: Determine the appropriate retaining wall design based on structural conditions and local building codes.