Historic buildings embody the artistry, craftsmanship, and character of their time. Preserving them requires a delicate balance between modern performance and respect for original materials. In this effort, sealants play an essential role, protecting architectural envelopes from water intrusion, air leakage, and environmental degradation while ensuring long-term structural integrity.
The Importance of Sealants in Preserving Historic Envelopes
Water, air, and movement are constant threats to historic buildings. Expansion and contraction due to temperature fluctuations, wind loads, seismic shifts, and settlement can stress joints and create pathways for moisture infiltration. Over time, this leads to deterioration of original materials such as limestone, marble, granite, and terra cotta.
Sealants act as the first line of defense, bridging gaps and accommodating building movement while preventing water from reaching vulnerable substrates. However, many conventional silicone products release low-molecular-weight silicone fluids that migrate into porous surfaces, leaving stains that are nearly impossible to remove. In addition, residue runoff from these fluids can streak glass, metal, and surrounding finishes, detracting from the building’s visual integrity.
For restoration professionals, preventing these issues is not optional, it is critical to maintaining both the aesthetics and structural performance of historic architecture.
Pecora’s Non-Staining Technology: Protecting Beauty Without Compromise
In historic preservation and restoration projects, the wrong sealant can leave lasting damage. Porous stones, aged brickwork, and delicate metals are particularly vulnerable to staining and residue buildup caused by traditional silicone formulations. That is why Pecora’s Non-Staining Technology™ (NST) has become a trusted solution for restoration professionals across the country. Designed specifically to protect sensitive substrates, Pecora’s NST sealants provide high-performance weatherproofing without compromising the appearance or authenticity of historic structures.
Pecora’s Non-Staining Technology™ was developed to address these exact challenges. Unlike traditional silicones, NST formulations are engineered without free silicone fluids, which eliminates the risk of substrate staining and residue rundown. This innovation makes Pecora’s sealants especially valuable for restoration projects where visual continuity and material preservation are paramount.
Whether the project involves limestone cladding, aged masonry, historic bronze framing, or original glass details, NST ensures the sealant does its job unnoticeably. The result is a seamless blend of performance and preservation, allowing restoration teams to protect historic facades while maintaining their original appearance.
Applications in Historic Preservation
Pecora offers a comprehensive portfolio of NST products tailored to a variety of historic applications. Pecora 890NST is ideal for high-movement expansion joints on stone and masonry facades, providing maximum flexibility without risking stains. For sensitive restoration projects requiring subtle aesthetics, Pecora 864NST delivers low-modulus performance while preserving delicate substrates.
Glazing retrofits and window perimeter restorations often call for Pecora 895NST, a structural and weatherproofing silicone designed to maintain clean sightlines while safeguarding historic frames. For projects requiring seamless visual integration, Pecora 890FTS is a field-tintable, non-staining silicone that can be color-matched to any substrate on-site. Pecora 890FTS-TXTR offers the same properties but in a textured option that can replicate original mortar, stone, or paint finishes. This textured sealant is particularly effective when recreating the look and feel of historic grout joints, ensuring repairs remain visually unobtrusive.
Proven Performance in Historic Projects
Pecora’s NST solutions have been trusted on numerous high-profile restoration projects. At the Empire State Plaza in Albany, New York, Pecora 890NST was selected for vertical façade joints across multiple marble-clad structures, while 890FTS provided weatherproofing for window perimeters. The decision to specify NST sealants was driven by their proven ability to perform without staining the sensitive marble surfaces.
At the Masonic Temple in Philadelphia, a designated National Historic Landmark, preservation teams used Pecora 890FTS to re-seal window perimeters. The project demanded both high-performance sealing and aesthetic precision, and Pecora delivered a custom “Masonic Gray” color match that blended seamlessly with the existing façade. Because of the NST formulation, the team avoided staining risks and achieved a finish that respected the building’s historic character.
Preserving the Past with Confidence
Historic preservation demands materials that deliver reliable protection without compromising authenticity. Pecora’s Non-Staining Technology offers restoration professionals the performance they need and the sensitivity these projects deserve. From movement joints to window perimeters and delicate stone facades, Pecora’s NST portfolio, including 890NST, 864NST, 895NST, 890FTS, and 890FTS-TXTR, provides solutions that safeguard history while maintaining the timeless beauty of our most treasured landmarks.
Pecora’s track record on projects like the Empire State Plaza and Masonic Temple demonstrates why preservation architects and contractors nationwide trust NST sealants to protect the past for generations to come.
