I had a geothermal furnace put in recently, and with that, the old heat pump was removed. The electric from the heat pump was run through a hole through the foundation to the panel. The hole is about 3 inches in diameter. The foundation is cinder block, there is a gap between the exterior and interior portion of the block. How do I patch this hole?
If I use the hydraulic cement or spray foam, won't it just fall into the cinder block gap? Do I get some wire mesh and slather concrete over it?
I like to pretend to be a DIY person, but really I don't really know what I'm doing most of the time. So any resources/products/ideas would be greatly appreciated!