FAQs

In general, on what surfaces can AirStone be applied?

Please refer to the instructions for a list of approved interior and exterior substrates. Although we cannot list every possible surface, as a general rule the substrate must be completely rigid so that it will not expand, contract, flex or bow over time due to environment or humidity. (Note: wood is not recommended as an exterior substrate.)

Is it OK to adhere AirStone directly to existing tile or brick (for example, on a fireplace)?

Yes, you can adhere AirStone directly to tile, brick, stone, or marble, but it’s important that these substrates are in good condition (not chipped, cracked, crumbling or loose) and clean/free of dust before you begin your AirStone project.  If substrate is painted, the paint must be in good condition (peeling, chipping paint will need to be scraped/sanded and cleaned).

What adhesive do I use for exterior projects?

We recommend Loctite PL Premium Construction Adhesive, available at many hardware retailers.  You can also use an ANSI A118.4 polymer modified mortar, which requires mixing.

Are there any temperature limitations when installing AirStone?

Yes, for interior projects, using AirStone Interior Adhesive, it should be at least 60 degrees F inside the room for 24 hours prior and 48 hours following installation.  It should not be used where temperatures will exceed 120 degrees F or fall below 32 degrees F.

For exterior projects, using Loctite PL Premium Construction Adhesive, it should be at least 40 degrees F outside during installation, and for 24 hours following installation.  It should not be used where temperatures will exceed 160 degrees F.

Is AirStone safe to use around fireplaces?

AirStone is non-flammable, non-combustible and safe to use around wood stoves and fireplaces. It has a Class A rating in accordance with ASTM E-84 standards.  AirStone Interior Adhesive is rated up to a temperature of 120˚F, and Loctite PL Premium Construction Adhesive is rated up to a temperature of 160˚F.

Is it OK to use AirStone on a hearth?

We do not recommend using AirStone on floors, ceilings, hearths, counter-tops, or any horizontal surface.

Is it OK to use AirStone INSIDE a shower?

Technically, it’s fine if AirStone gets wet (of course! It’s approved for outdoor use!). HOWEVER, we probably would not recommend it for INSIDE a shower considering that you shouldn’t use harsh cleansers and stiff scrub brushes that are commonly used to clean shower areas. The constant build-up of soap residue and all the nooks and crannies on AirStone could make it difficult to keep it clean. Plus mold could build up behind the stone, which isn’t a problem when it’s outside.

What are the dimensions of each piece of AirStone?

AirStone is 2” or 4” in height, with lengths of 4”, 6”, 8”, 10” and 12”. The depth of the stone averages about 3/4” (the stone molds are cast from real stone, so the depth can vary anywhere from 1/2” to 1-1/4”, even on the same piece).

In my AirStone project, the corners are not 90˚, so your corner pieces will not work for me. What should I do?

When a corner is not 90˚, two pieces may be mitered to form the proper angle. Simply mark the angle with a pencil and cut the ends accordingly, so that the two pieces butt up to form a corner.  This can also be done using a finished end piece paired with its matching primary stone mate.

I see you offer outside corners but not inside corners. What is the best way to install an inside corner?

AirStone is designed to replicate real stone. Since there is no such thing as a real stone inside corner, simply end the stone at the end of the first wall and then begin installing the second wall (so that the end of the stone on the second wall overlaps/butts up against the face of the stone on the first wall).

I want to use a power saw to cut the AirStone. What type of blade do you recommend?

You should use a masonry blade (no teeth). When using a dry power saw, wear an approved dust mask and be sure that the back of the stone is free of dust before adhering to the wall. If using a wet saw, be sure that the stone is dry before applying AirStone Adhesive.  Rinse the piece with clean water after cutting, and dry it face down.

How much AirStone will I need for my project?

The AirStone “primary wall stone” comes eight square feet to a carton.  Our “corner/finished end stone” can be used for corners AND/OR finished ends.  One carton contains 6 linear feet of edging and 7.5 square feet of coverage.  Also, one tub of AirStone Interior Adhesive (one gallon) will cover approximately 30 sq. feet.  One 28 oz. tube of Loctite PL Premium Construction Adhesive will cover 10 approximately sq. feet.

How do I clean AirStone?

AirStone can be easily cleaned with warm water and a soft-bristled brush. Do not power-wash AirStone.  Acid cleaners, bleach, paint remover or concrete cleaners should never be used on AirStone.

How do I get dried AirStone Adhesive off the face of the stone?

First, you should always try to clean AirStone Interior Adhesive off the face of the stone BEFORE it dries. If it’s too late, try dampening the adhesive with a washcloth or mister (this will only work on AirStone INTERIOR Adhesive).  Try to keep it very damp for at least 30 minutes or longer until it starts to loosen up.  You should then be able to scrub the adhesive off using more water and a soft toothbrush.

Is it possible to paint or stain AirStone?

We have had customers who have painted and stained AirStone and were very happy with the results. Feel free to experiment if you wish, but we cannot recommend one particular brand of stain or paint over another.

Can I use a sealant over AirStone?

Yes, in fact we recommend this for areas where AirStone may be subject to food splatter or grease, such as a kitchen backsplash or an outdoor grill. Use a high-quality stone or concrete sealer.  Follow the manufacturers directions carefully.

Where can I buy AirStone?

AirStone is currently available through hundreds of Lowe’s (U.S. only), and also on lowes.com.  AirStone is currently not available directly from the manufacturer.

Can I use common mortar when applying AirStone?

No, but you can use an ANSI AII8.4 polymer-modified thin-set mortar.

I have an exterior project and will be applying AirStone to cement board. Do I need to do anything to prepare the surface before I begin?

Cement board should only be used for exterior projects that are detached from the home, such as mailboxes, planters, outdoor kitchens, etc. (see next question if adhering AirStone directly to the exterior of a home).  Make sure your backer board is rated for exterior use, and is free of all factory dust.

I would like to apply AirStone to the outside of my home over the existing brick veneer. What do I need to know?

As long as you are working with an existing, exposed outdoor structure (assuming it has been designed to meet applicable building codes), AirStone can be applied directly onto weatherproof substrates, such as brick, concrete, ceramic tile, stone, stucco or concrete block.  We recommend using Loctite PL Premium Construction Adhesive for any exterior project.