Today I went and picked up some free drywall (I love freecycle.org!), and rented a jackhammer to remove the old front porch, which will be enclosed and become part of the kitchen. It was covered in flat pieces of sandstone with bricks around the inside edges. I figured it was a good day to do it because Katarina was at work, and our neighbors on that side of the house were out of town today.
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He was entombed in a space in the porch, with no obvious entrance (and clearly for him, no exit.) What was more odd (though not as startling a discovery) was that the space also had some insulation in it. Not the 1940s-era cellulose stuff that was near the main DWV vent stack, but some more modern fiberglass batt insulation. Besides the weird cellulose stuff, and some incorrectly installed stuff under the living room floor, the house had zero insulation when I moved in. So what the heck were they doing insulating the front porch??
Anyways, after slow progress on the front of it, the rest went quickly. It was two layers of concrete, and a layer of sandstone or brick on top. Between the multiple layers and the flex of the wood underneath, it came out pretty quickly. I've still got a lot of work to do to remove and replace the rotted wood, but I was able to get the jackhammer back in under 4 hours. Yay!