The Global Standard for Conserving Historic Plaster
Historic Plaster Conservation Services (HPCS) was founded in 1988 to pursue opportunities in the very specific field of architectural plaster conservation. We address and repair the structural problems of fragile plaster in historic buildings.
Over the years, we have developed and patented an array of specialty products, techniques and tools, designed to strengthen and re-attach existing plaster on ceilings and walls. We address the problem at its root – where the plaster meets its substrate.
Our specialty products and techniques are effective on the most elaborately embellished plaster and on the simplest plain face vernacular plaster. Traditional lime plaster on wood lath, cementitious plaster on expanded metal lath, plaster on masonry and even cast fibrous plaster suspended ceilings respond well to our conservation treatment programs.
Consolidating and Securing Failing Plaster in Historic Buildings
We specialize in addressing the systemic deterioration of plaster. Applied as a preventive maintenance procedure, our products economically extend the safe and maintenance-free service life of historic plaster ceilings – avoiding the tragedy of collapse and the huge expense of reconstruction. In short, we preserve original plaster.
Leading preservation architects and heritage consultants specify the HPCS approach in restorations where important plaster is at risk.
Our goal is to work with clients who value the original building fabric for which they are responsible and who wish to retain this fabric with the lowest possible level of disruption and cost.
Toronto, Ontario (1899) The Building:The Richardsonian Romanesque former City Hall is one of the largest buildings in Toronto and was the largest civic building in North America upon completion in 1899. Consolidating Plaster from a Remote Location in 150 RoomsThe collapse of a section of office ceiling in 2006 precipitated an investigation by HPCS that revealed widespread delamination of wood lath and plaster ceilings in more than 300 rooms, many with elaborate plaster cornices and other details. Interestingly, the architect, E.J. Lennox had chosen to use plaster on wood lath in offices and secondary spaces, and the more modern expanded…
HPCS Product Lineup
AD 25 Gel Injectable Dowel Setting Adhesive and AD Premixed Plain Face Plaster Lug and Key Replacement
CO R-100 BASE Plaster Consolidant Agent
GR Non-Shrink Premium Plain Face Plaster Grout and GR Premium Ultra-Fine Injectable Crack & Void Filler
EN HazMat Gel Hazardous Material Encapsulant
RE Aramid Gel Fiber Reinforced Plaster Rebuilder