Flat Arch

[Rob Amaral]

http://www.treanorarchitects.com/static ... _fig76.jpg

I'm sure some of us have run into this.. There is a neighborhood in BOS near the former Cocoanut Grove fire area that has some of this...

[Marc]

Structural terra cotta?

I wonder if the 'fill' is gypsum?

Marc

[kurt]

What year would those have been built? 1880's-90's?

[Bill Kibbel]

What year would those have been built? 1880's-90's?

After 1900.

http://historicbldgs.com/terra_cotta.htm

[Tom Raymond]

There is a modern interpretation of that about 20 miles north of me. The owner of a concrete plant built 3 modest ranches out of concrete in the late 60s. Poured foundation, concrete tile floor platform, block walls with brick veneer. Wood ceiling joists and rafters..

[mjr6550]

No that uncommon in old commercial buildings in major cities. The fill is often cinders or slag.

[Jim Katen]

No that uncommon in old commercial buildings in major cities. The fill is often cinders or slag.

Really? I'm looking at the illustration and wondering what "f" is. Can't be cinders or slag. Wouldn't it be some kind of grout, like gypsum or cement? I think this is the same thing Marc was wondering.

[Rob Amaral]

There was no fill in units in the building I inspected...

[Jim Katen]

There was no fill in units in the building I inspected...

What formed the finished floor surface and how was it fastened in place?

[kurt]

My apartment building is a variation of this. Grout is a very rich Portland cement, then a slurry of not so rich on top of that, then sleepers or furring on the concrete, then t&g oak strip finish.