The old oven vent and plumbing pipe holes in the kitchen were long overdue for patching. Both holes were originally round, but the larger one needed to be cut square to patch it properly. Here it is with one replacement piece installed. Here with the wood pieces installed. At this point the backside has been filled with Great Stuff foam and 2" of solid foam for insulation, on both the large hole and the small one. In the image above you can see the first failed attempt to just use great stuff, but it would not stick and fill the area properly without the solid foam for support. And here it is with one coat of paint on it. There is some fresh paint on the beam, the rest of the beam will need a full coat as it's only had one coat on it.