Plaster on Masonry - St. Ann School

Re-adhering plaster to concrete

Bronx, New York (1950)


To Remove or not to Remove? That was the Question

Widespread delimination of the gypsum plaster skim coat from the cast concrete ceiling presented a safety problem in this school built in the 1950s.
Two remedial options were considered: 1. Scrape off the existing plaster and then re-plaster; or 2. Re-adhere the existing plaster to the concrete. Option 2 was selected and Historic Plaster Conservation Services was retained to design a treatment program that was much more economic than Option 1. The treatment program involved the development of a system to inject HPCS AD 25 GelTMIndependent testing, designed by engineer, John Dilassio, and conducted by Ken Follet of Quality Restoration Works, confirmed the success of the treatment program.


Adhesive - AD 25 Gel    
AD 25 Gel™