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About StonePly Curtain Walls

StonePly Curtain Walls

StonePly Cladding

StonePly Success Stories

When it came to making sure their first impressions were unforgettable ones, countless businesses have called upon StonePly to provide legendary curtain walls and storefronts.

Businesses that have found success with StonePly include:

At StonePly, we are proud of the company we keep. We look forward to bringing our experience and first class quality stone panel cladding to your project.

StonePly Cladding vs Traditional Stone Cladding

Blast Load
The curtain wall is the protective envelope of a building and as such becomes the first line of defense in a bomb blast or accident. Currently, all new federal buildings in the United States and all United States Embassies built on foreign soil must have resistance to bomb blasts.

StonePly panels are flexible by nature thanks to their aluminum honeycomb backing. This flexibility allows the panels to deform and absorb the blast energy, without shattering.

Traditional stone cladding is extremely dangerous when shattered. Chunks of heavy stone raining down is, needless to say, a safety hazard. In the event that the stone face of a StonePly cladding panel is shattered or fractured, the stone remains adhered to the aluminum backing, keeping safe the civilians, first-responders, and remaining structure below.

Dead Load
With a low weight compared to thick stone slabs, StonePly reduces the dead load on the curtain wall structure. Weighing just 3.5 lbs. per square foot, about the same as 3/8" glass, StonePly greatly reduces the gravity load on the curtain wall assembly compared to common stone cladding.

Due to its rigid nature, thick building stone panels are not able to flex the same way as aluminum. This causes difficulties in stone curtain wall design and detailing. Unlike thick stone cladding, StonePly is ductile and flexible. It can sway and move with the curtain wall without cracking.

Fire Safety
In a fire, solid stone cladding can shatter and break from the intense heat, jeopardizing the lives of firefighters and others below.

Thanks to its lighter weight and aluminum reinforcing, StonePly limits the risk posed in a fire. In fact, StonePly has an ASTM E-84 flame spread index of 5 and a smoke contribution index of 5. The "smoke contribution" of StonePly is primarily water vapor and can vary by stone type. This gives StonePly a Class A per the NFPA standard or Class 1 per the UBC standard.

Read more about StonePly fire testing and ratings.

There does not exist a natural building stone that is 100% air and water tight. While some granites can require hours of soaking rains to allow moisture to penetrate, travertines will allow moisture to practically flow through them like a sponge.

However, the aluminum honeycomb backing of StonePly is impermeable, which keeps the structure behind mold and rust free.

Read more about StonePly's backing options.

Seismic Load
Lightweight StonePly panels offer a resilient, flexible and inherently safer cladding material than common stone cladding.

Thermal Insulation
StonePly is thinner than common stone curtain wall cladding. This allows the use of more insulation in the curtain wall and translates into real energy savings.

Wind Load
StonePly is tested up to a 200psf wind pressure! Large missile testing has proven its ability to survive hurricane force winds and wind blown debris that normal stone cladding cannot.

Comparison Matrix

Property Common Stone cladding (1 3/4" granite) StonePly HC StonePly ACM
Impact Resistance 60 ft lbs 3,200 ft lbs 1500 ft lbs over backup
Weight (approximate weight, varies by stone type) 27 lbs/sqft 3.3 lbs/sqft 2.5 lbs/sqft
Large Missile Impact Test   Passed Passed when adhered to solid substrate
Install Method Kerfs or slots in stone and steel anchors Z clips, concealed screws or structural silicone adhesive Adhesive
Install Speed Very slow Fast Fast
Weight per 4' × 4' Panel (approximate weight, varies by stone type) 432 lbs 54 lbs 40 lbs
Thickness of Assembly 4" to 6" 3/4" to 2" 1/4"
Fire Ratings Class A (NFPA Standard)
Class I (UBC Standard)
Class A (NFPA Standard)
Class I (UBC Standard)
Class A (NFPA Standard)
Class I (UBC Standard)


Installation with StonePly is a snap. 

  • Renovating? StonePly can be installed over existing cladding to renovate the property without the need for disruptive and expensive demolition.
  • Able to accept a screw anywhere on the back of the panel thanks to a continuous aluminum back plate. No more slow and messy epoxy set nuts and epoxy anchors.
  • StonePly stone panels are made of thin stone and aluminum, which can be cut by a carpenter on-site to fit if necessary.
  • Using a Z-clip system, StonePly panels are quickly and easily attached, meaning construction moves fast and without error.
  • Large assemblies can be fabricated in the factory to form natural stone column covers, cornices, etc. The assemblies are then shipped to the job site for quick installation.
  • Can be installed over simple steel stud framing.

Get detailed instructions for installing StonePly cladding.


Get detailed attachment drawings for StonePly curtain walls.


Preview Summary Date URL
StonePly at Tommy Hilfiger Store StonePly at Tommy Hilfiger Store
Designed by the Tommy Hilfiger creative team in partnership with Callison Architects, the designers selected Stoneply panels for the stone cladding of the 22,000 sq ft store. Five stories tall, the store opened to celebrities and rave reviews.
Sep 09, 2021 URL
StonePly at  Delnor Hospital StonePly at Delnor Hospital
StonePly Exterior Cladding was Delnor Hospital’s solution to all the challenges they faced. StonePly panels are simple to install, affordable, and can accommodate for future expansions.
Jun 14, 2021 URL
Stoneply Mocha Cream Limestone at Delnor Hospital Stoneply Mocha Cream Limestone at Delnor Hospital
Delnor Hospital had a specific budget and construction demands.They needed an affordable alternative to solid stone that could be installed while part of the hospital was still operating and would not obstruct future renovations or expansions.
Mar 10, 2021 URL
Case Study: Queens Hospital Center in Jamaica, NY Case Study: Queens Hospital Center in Jamaica, NY
Included in the exterior design of the Queens Hospital Center is polished Stony Creek granite which spans the first and second floors of the building. StonePly was chosen to supply the granite panels because of our proven track record, with extensive e...
Dec 03, 2020 URL

Brochures | 3-Part CSI specifications | CAD details

Brochures for StonePly Curtain Walls

Brochures for StonePly Curtain Walls
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Featured Projects
Featured Projects

3-Part CSI specifications for StonePly Curtain Walls

3-Part CSI specifications for StonePly Curtain Walls
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Quickly review and print specifications for various applications.
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CAD details for StonePly Curtain Walls

CAD details for StonePly Curtain Walls
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News archive:
StonePly Panels at NASA Deep Space Human Exploration Center (Jun 12, 2020)
StonePly at the US Nuclear Regulatory Commission building (Mar 11, 2020)
Stoneply Mocha Cream Limestone at Delnor Hospital (Apr 05, 2019)

04 40 00 - Stone Assemblies
04 42 13 - Masonry-Supported Stone Cladding
04 42 43 - Stone Panels for Curtain Walls
08 40 00 - Entrances, Storefronts, and Curtain Walls
08 44 00 - Curtain Wall and Glazed Assemblies