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How to Retrofit Foundation Footings

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Construction

How to Retrofit Foundation Footings

To make a low-height basement a more comfortable living space, this remodeler digs deeper but needs to add support to do so


April 11, 2024
foundation footings
To direct water into the drainage trench, the OA Design Build team covers the foundation wall with a dimple sheet. | Graphic courtesy ProTradeCraft

This Minneapolis home remodel required several major structural changes to meet the needs of the client: new foundation footings and a new slab. 

To ensure comfort, a resilient home, and top notch performance, the OA Design + Build + Architecture team plans to insulate under the slab, add radon mitigation, throw in some floor heat, and a capillary break. 

(This entire project and all the nitty gritty construction details that follow can be followed through Pro Remodeler’s sister publication, ProTradeCraft and its Building Resilience season three.)

Watch the process below, or continue reading.

 

Why Retrofit Foundation Footings?

It’s a result of the work on the home’s first floor that impacts the lower level. As it stands, the basement is barely tall enough for people to comfortably walk through. 

So, the OA team plans to remove 19 inches of soil to drop the basement floor. This gives them the opportunity to transform the space into a comfortable living area with insulation and added heat.

But before any of that can happen, the remodeling team needs to retrofit footings to the existing foundation.

In ProTradeCraft’s first episode of Building Resilience season 3, “Basement Living Space Solution: Footing Retrofit and Structural Slab,” it’s outlined that the retrofit footing necessity comes from the lack of footings to begin with when the concrete foundation was poured 100 years ago. 

 

protradecraft
Step one is to dig into the sandy soil at a 45-degree angle. | Graphic courtesy ProTradeCraft

 

Retrofitting the Foundation Footings

Step 1: The team digs (quickly) at a 45-degree angle away from the bottom of the foundation wall without disrupting the bearing capacity of the soil and dig an interior trench for drain tile

Step 2: To direct water into the drainage trench, the OA team covers the foundation wall with a dimple sheet.

Step 3: Styrofoam insulation is added under the spot where the interior footing curb will be, and then the OA team throws in some rebar in two directions.

 

retrofit

 

Step 4: The concrete curb is poured. (Note from ProTradeCraft: In the real world, you need to build a form. And then strip it after the pour.)

Step 5: Prepare for styrofoam insulation under the soon-to-come slab by taping seams. Then the team lays down hydronic tubing for in-floor heat, which sits on top of the insulation.

Step 6: The slab is poured between the curbs.

 

retrofit footings
Styrofoam is installed, seams are taped using construction tape, in-floor heat is placed on top. | Graphic courtesy ProTradeCraft

 

Want to see this in real time? Check out ProTradeCraft’s Building Resilience season three, episode two where Michael Anschel, principal of OA, shows the project in detail and each step for insulating and why.

 


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