GenStone Common Questions (FAQ)

We've gathered the most commonly asked questions about GenStone Faux Brick & Stone Siding. If you have a question that isn't listed here, please contact us and we will be happy to help answer it.

Common Questions

What is GenStone made out of?

GenStone faux stone and brick veneer is made of a closed-cell high-density polyurethane. This material is what makes GenStone so lightweight and easy to install without making a mess. Each panel is cast from 4-5 unique molds made from real stone or brick and hand-painted with 12 coats of paint to avoid repetition and give a more random, authentic appearance.

How much does GenStone weigh?

GenStone weighs approximately 1 to 1.5 pounds per square foot, making it easy for one person to handle and install which then eliminates the need for lift equipment and extra labor. It’s made of high-density closed-cell polyurethane, which is what makes it so light.

What is the height and length per panel?

GenStone panels are 42" long by 12" tall with a coverage area of 41" long by 11" tall. The stacked stone panel features a 1″ shiplap edge along the top and right side of the panel, making attaching the next panel not only seamless but also watertight. Each panel covers roughly 3.13 square feet of space.

How thick is GenStone?

The surface of GenStone varies due to the nature of the rock, but the thickness at the lip and the joint is a minimum of ½” to a maximum of 2”.

Does GenStone have an insulation value?

GenStone has an R-Value of 3.6 per inch. R-Value refers to the material’s thermal resistance, or, in other words, the material’s ability to keep hot or cold air inside or outside of the structure. Below is an infographic that explains R-Value in more depth.

What is GenStone’s warranty?

GenStone has a 25-Year Limited Warranty. It warrants that the Trim, Panels, Corner, and Ledger Pieces will not blister, peel, corrode, rust, rot, delaminate, flake, or excessively fade due to defects in materials or manufacture when used for its intended purpose, is properly installed, and is maintained according to GenStone’s installation instructions for a period of 25 years from the date of purchase. If you have a claim you need to submit for your warranty, GenStone needs to be notified promptly so we can validate the claim. We will repair, replace, or refund the purchase price of the product. The warranty also offers limited hail damage protection if your homeowner's insurance (or other insurance sources) does not cover the entire damages. We may cover up to the replacement of the damaged product.

Where can I get a sample?

Faux Brick and Faux Stacked Stone Samples can be purchased through DIY Home Center. If you purchase a sample and end up placing an order for GenStone, you will be credited for the cost of the sample you paid for. Each sample is 12” x 12”, but if you’re wanting a better depiction of the color profile, it’s recommended to purchase a full panel.

What applications are best suited for GenStone?

GenStone faux stone and brick veneer is perfect for a variety of interior and exterior residential, commercial, or industrial applications, such as accent walls, fireplaces, patio enclosures, window trims, foundation, porch pillars, and more.

What kind of maintenance does GenStone require?

While GenStone is virtually maintenance-free, there is some recommended maintenance to keep your GenStone looking as new as the day it was installed. The GenStone Use & Care Guide addresses that in more detail.

How do I measure the area I want to cover in order to purchase the right amount of product?

When you are trying to determine how many GenStone panels and accessories you need, there are two ways to go about it. One way is to start by measuring the total linear feet in your improvement area. A linear foot is simply a measurement of how many feet make up the area horizontally. The other way is to determine how many square feet your area is composed of and divide that number by the coverage area of the stacked stone or brick veneer panel. We typically recommend using the linear foot method because you will need the linear feet measurement to figure out how many ledgers and trim you may want to incorporate into the project. Check out GenStone's How To Measure Guide for more information and helpful tips.

How easy is it to install GenStone?

GenStone can easily be installed by one or two people with very basic carpentry skills in a surprisingly short amount of time.

What tools and materials do I need to install GenStone?

View the GenStone Installation Checklist for a breakdown of what tools and materials you will need for your project.

How do I know how much caulk I will need?

GenStone recommends 1 tube of Big Stretch White Caulk for every 100 square feet installed and 1 eXact Color Caulk Kit for every 400 square feet installed. See the GenStone Caulk & Paint Overview for additional information.

What’s the difference between GenStone's Big Stretch White Caulk and their eXact Color Caulking?

Both caulking products have the same properties and will perform the same no matter where the caulk is applied. Big Stretch White Caulk is recommended for areas where you will not see it, simply because it’s less expensive. The eXact Color Match Caulk is meant to be used in visible areas.

What kind of adhesive is recommended?

It’s recommended to use a polyurethane-safe adhesive such as PL-200 or PL-300. Both are great adhesives for construction and are good for both indoor and outdoor use. They’re environmentally friendly, water-based adhesives that can bond to most building materials and are intended to give an easy cleanup.

Do I still use adhesive on the panels when there is a vapor barrier?

When installing GenStone over a vapor barrier, adhesive is not required.

What do you cut the panels with?

GenStone is a faux rock that is made of a lightweight durable substance that can be cut with any wood cutting blade, but most will use a circular saw. Because the inside of the panel is flat, you always want to cut on that side.

Are strapping or starter strips needed when installing GenStone panels?

GenStone artificial siding only requires a clean, dry substrate such as OSB, plywood, concrete, or existing siding provided the surface is flat such as RB&B, Textured 1-11, or any hardboard panel siding. The panels are easily applied to almost any flat surface. There are no strapping or starter strips required unless you are installing or purchasing the product in Canada. Simply use a polyurethane-safe adhesive (PL200 or PL300) and attach it with concrete screws (Tapcons).

If I’m installing this product on an existing concrete wall, can I just use glue and not screws?

When installing GenStone to concrete, it is recommended to use both concrete screws (Tapcons) and a polyurethane-safe adhesive (PL200 or PL300) for a long-lasting, secure installation. The glue may be effective on its own for a period of time, but there’s no guarantee it will stay securely for as long as it will with screws.

Can I use GenStone on a curved surface?

No, because there is no flex in the GenStone panels, they require a flat substrate surface.

Can GenStone be installed in a bathroom around a tub or shower?

Although the moisture created in a bathroom is not a problem for GenStone, there is no testing on how the soap scum and household cleaners will affect the products. For this reason, it is not recommended to use GenStone around a tub or shower.

Can GenStone be installed over stucco?

Yes. It is recommended to use deck screws to install the faux stone panels, however, if it’s too difficult to get them into the stucco, Tapcon screws may be used (similar to applying to a concrete substrate). In either case, it’s recommended to use Tyvek paper on the substrate and a polyurethane-safe adhesive (PL200 or PL300). The Tyvek paper protects the stucco from the adhesive should you, or any other person ever wants to remove the stone.

Can GenStone be installed over existing brick?

Yes. GenStone artificial siding only requires a clean, dry substrate, such as OSB, plywood, concrete, or existing siding, provided the surface is flat such as RB&B, Textured 1-11, or any hardboard panel siding. We recommend Tapcon screws to fasten your GenStone to existing brick. Tapcon screws can be drilled into the brick as well as the mortar lines.

Can I install GenStone over cinderblock for an outdoor barbeque area?

Yes, however, if any of the areas get too hot to touch, it is not recommended to place GenStone in those areas. Installing stone veneer panels over poured concrete or cinderblock requires at least 8 mechanical fasteners – 3 into top shiplap, 3 into the face (field) at bottom 1-4” of the panel, and 2 on right edge shiplap. (Please use Tapcon, Calburn, or equivalent hardened masonry screws) and generous glue pattern (PL300, Franklin General Purpose, or equivalent) on the back of panels to help hold the panels. Housewrap is not required over cement applications or ICFs).

Can GenStone be installed around a fireplace?

Yes and no. GenStone cannot be installed in areas that are exposed to sparks or flame. If you have a zero clearance or gas fireplace, GenStone can typically be placed next to the unit. However, if the area around the fireplace gets hot to the touch (too hot to touch for longer than 10 seconds), please contact the fireplace manufacturer for the specific distances necessary to safely install GenStone products.

What width do my porch columns have to be to wrap in GenStone?

GenStone offers two options. The first option is four 90° corners that are designed to fit a 16” column, giving a finished measurement of about 19”. These corner pieces are 2' tall. The second option is the pillar panel system. Pillar panels are made to fit around an 8” post with an outside dimension of 11”. Each pillar panel is 48”. Four panels would be needed to wrap your post. With either option, you may stack GenStone to reach your desired height.

Do the pillar kits come with trim pieces for the top and bottom to give the pillars a finished look?

The pillar kits do not come with trim pieces, but GenStone does have accessories that are available to purchase separately. GenStone offers a peaked-style and a flat-style cap to finish off the top of pillars and columns. Other than for aesthetic purposes, the caps also help to shed water. For the base, you can either cut out the center of a cap so that your piece maintains its paired fit to the kit you are using, or custom cut pieces of ledger to fit around the desired area. The latter option will require a bit more carpentry skill.

Is there a specialized trim plate for installing onto metal buildings?

There are specialized strips known as ‘furring strips’ that are designed for this type of installation and are available at your local hardware store. You will also need closure strips to close the area between the backer board and the building. These closure strips can be purchased from the manufacturer of your metal building.

How do I install GenStone over a corrugated metal building?

To apply GenStone to a metal building, a backer board must be used to provide a buffer between the building and the panels. This is necessary because of the properties of the building. This backer board should be plywood or OSB of at least ½” thick and should be attached securely to the building using construction adhesive and screws. Once the board is attached, you can follow the same procedure as installing to wood.

What color are the ends once the pieces are cut?

When GenStone is custom cut, the polyurethane foam will be exposed and should be painted using one of GenStone’s color-matched paint kits. The area where the factory panels terminate are a flat cut surface, which makes painting simple.

Do the raw edge of panels need to be painted?

The edges of GenStone’s panels are smooth painted surfaces. However, anywhere a custom cut is made, you will need to cover over the exposed foam with a color-matched paint kit.

How do you miter the pieces so that the rough edge is maintained on the end?

Mitering GenStone’s panels can be a great way to customize any project. All of the detailed and rough surfaces are on the face of the products, and the seams where the panels meet are smooth surfaces. This helps to keep that unified look throughout your project.

How do you handle the end of a wall?

The end of a wall can be finished by 1) using the corner panel lefts and rights, remembering to stagger your seams; 2) by cutting the panels to butt up against a piece of our trim; or 3) cutting panels flush with the end of your wall. In all cases, custom cuts will need to be painted with a corresponding color-matched paint kit.

How do you terminate the ledger at a window or door?

GenStone products have a smooth edge for a uniformed connection to the adjoining piece. To terminate at a custom length, cut the product to the desired length and then cover any exposed foam with a color-matched paint.

Is it okay to spray an insect pesticide preventative on the surface of GenStone?

If the pesticide is water-based, there should be no harm in spraying it on GenStone.