After looking at these images posted by others on voat of Pegasus, I am starting to believe Pegasus may actually have a large space below the building. Please refer to the photos below posted on Voat by other members.
Also, keep in mind. The park two houses down used to be a Trolley turn around. Any chance of stuff underground around here historically?
Where is this picture from in Pegasus ? https://i.sli.mg/twRY6g.jpg I don't see any other concrete ceilings in the building. This picture makes me think the first picture is a basement. (look at the white tube) https://i.sli.mg/Tg1EzT.jpg
Also, Here they are pouring cement. on the bottom level. Take note of the wire grid, usually used to reinforce. Why would you reinforce cement on the floor if there weren't a basement? Anybody here familiar with laying concrete flooring? is this normal?
https://i.sli.mg/dtHzNj.jpg
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Kwijibo ago
Yeah, you reinforce cement with or without a basement. But the fact that it looks like they are putting the cement on top of insulation board makes me think there is a basement. I would assume any large building in the D.C. area has a basement, it is very common in the northeast.
MyPresident ago
"under-slab insulation" or "below-grade insulation" -- both are most certainly a thing.
yabbadoody ago
if you don't put it UNDER the floor, then you don't get any R Value for the insulation - which means you're sacrificing strength (concrete) for almost zero R-value, unless you're adding a wood or wood-and-tile floor atop. Most would just place the insulation BELOW the pour, especially if the old floor was coming out, as this one is. That way, your doorway openings stay relatively the same... meaning, you can probably reuse the original, old antique doors As-Is.
Kwijibo ago
Yeah, that looks like you would put that under a basement floor. I am not sure if it would be used in a grade-level slab or not.