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.

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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.

Featured Projects

St. John’s Episcopal Church

Yonkers, New York (1752) The Building: This historic church in the Getty Square neighborhood of Yonkers was originally constructed in 1752, with an addition in 1859 and modifications to the facade in 1874 by noted architect Edward Tuckerman. It is constructed of rough gray fieldstone with red brick on the corners. It is cruciform in plan, three bays wide, with a slate-covered gable roof. It was added to the National Register of Historic Places in 1982. Project Synopsis: An assessment of the plaster-on-wood-lath revealed severe deterioration typical in a building this old. HPCS USA was retained to consolidate the plaster in the…


HPCS Product Lineup

AD Adhesive HPCS product category badge

AD 25 Gel Injectable Dowel Setting Adhesive and AD Premixed Plain Face Plaster Lug and Key Replacement

CO Consolidant HPCS product category badge

CO R-100 BASE Plaster Consolidant Agent

GR Grout HPCS product category badge

GR Non-Shrink Premium Plain Face Plaster Grout and GR Premium Ultra-Fine Injectable Crack & Void Filler

EN Encapsulant HPCS product category badge

EN HazMat Gel Hazardous Material Encapsulant

RE Reinforcement HPCS product category badge

RE Aramid Gel Fiber Reinforced Plaster Rebuilder

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