I saw one of these recently... "Flat Tile Arch"

[Rob Amaral]

Right here in Boston... You never know.. Makes the job interesting.. Pays to hit the old bookstores for old engineering books.. We have great bookstores in this area..

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[Bill Kibbel]

I have the pleasure of seeing them pretty regularly. Hollow tile floors are quite common here within the mansions built between the late teens to late 30's. They're standard in almost all the French Manor, Beaux Arts and Tudor Revivals over 7000 sq. ft.

Plumbers, HVAC techs and electricians seem to always leave behind evidence of their frustration when trying to retrofit systems.