old lintel, masonry: what's it made of?
We think our house was built in the 1920's. The walls are solid (not
cored) cement block. Replacing a cellar window, I got looking at the
lintel over the opening. The surface is cementitious, but smooth, like
a casting. (The wall blocks have a pronounced raised texture.) When I
drilled into the bottom for a (Tapcon) screw, it seemed to be at least
partly hollow.
I'd appreciate any information (or even informed speculation) on what a
lintel from that period might be made of.
Thanks,
George
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