Frequently Asked Questions

I’ve never heard of “manufactured stone”. Is this a new product?

Actually, this product has been around for several decades. Despite this fact, it is surprising just how few people—even builders—realize that this product exists and that it makes a wonderful alternative to the real thing. Recent advances in the manufacturing process have improved both the quality and the appearance of manufactured stone, along with lowering the cost. It can be used in just about any sort of building project—commercial/residential, new construction/remodeling, interior/exterior, and landscaping.

What are some of the more common uses for manufactured stone?

Most people use it to enhance the exterior appearance of their home, office, or commercial building. But we provide stone for a lot of other kinds of projects too, like interior fireplaces, outdoor kitchens, retaining walls, wine cellars, and so forth.

Why is manufactured stone a good option?

Just about everybody loves the look of natural stone. But real stone is extremely heavy, expensive, and time consuming to build with. Our stone gets around all of these limitations… it’s kind of like 3-dimensional wallpaper, and any sturdy wall will do. Plus, since we make it custom to order in our Tulsa facility, you can get colors and styles that you’d be hard pressed to find anywhere else, including exclusive colors to fit your specific design needs. You can also use it in places where natural stone just won’t work, particularly in interior applications like kitchens or decorative walls.

What exactly is manufactured stone, and how do you make it?

Manufactured stone is a cast cement product that is designed to look and feel like the real thing. The process starts with the creation of a set of rubber molds. Our mold vendor carefully selects high-quality, representative natural stones with varying shapes and textures—the kind that will give lots of visual interest to the finished projects our customers wish to create. These natural stones are used as masters to create our molds. Once the molds are ready, we prepare a mixture of Portland cement, lightweight aggregate, water, and iron oxide color pigments, and then pour this mixture into the molds. We use a number of techniques to achieve the coloring and shade variations that each customer wants. Once the mixture dries, we remove the finished stone product from the mold. We then cure the finished product for a period of several days, and finally ship it to the customer.

What form does the finished product take—do I get individual stones or is it pre-formed into some sort of panel?

Most of our stone styles are delivered as individual stones, just as if you had purchased natural stone. Our QuickFit product is the only exception, as it features a “panelized” look that simulates Ledgestone through a series of rectangular pieces with multiple stone impressions per piece.

What about pattern repetition?

Our molds provide at least 100 square feet of finished product without repeating. This ensures that your project will achieve the look of natural stone with no noticeable pattern repetition. Of course, your installer must also strive to avoid grouping large numbers of similarly sized/shaped stones together to achieve the best results.

Where can I go to see how your stone is being used?

We suggest that your first stop should be our showroom where we can show you our stone samples and photos of projects we’ve done. When you come, please bring any items that you’ve already selected for your project, such as brick, tile, shingles, and so forth. Our personnel can help you identify the stone styles and colors that will best complement your selected project materials. If you have photos of stone projects that you like, bring them in as well so we can help you find or create a close match. Once we’ve narrowed down your options a bit, we can direct you to nearby homes, offices, or commercial buildings that have used the product(s) you are considering. And of course, you can check out our Gallery to see lots of finished projects.

What kind of cost am I looking at for a complete project—materials, labor, etc?

This question is rather difficult to answer, because we really have to fall back on the old “it depends” routine. But let’s start with the big picture… you basically have three choices when it comes to attractive, three-dimensional surfacing options: brick, natural stone, and manufactured stone.

Of these three options, brick is going to be the most cost-effective in virtually any circumstance. The only real exception might be an interior application where a suitable foundation does not already exist (a second floor fireplace, for instance). Brick is very heavy and it requires a solid foundation to support its weight. If a foundation needs to be built to support the project, the project cost can go up dramatically.

Next on the cost-effectiveness scale is manufactured stone. The product is classified as an “adhered veneer” due to its light weight (approximately 10 pounds per square foot). As such, it requires no footings, wall ties, or foundations and is therefore ideal for both interior and exterior applications. It can be applied to any properly prepared, structurally sound wall surface such as wood, wallboard, masonry, or metal. So there are almost never any “hidden costs” associated with installing the product. On the other hand, the product generally requires some surface preparation. It also calls for an installer with a fair amount of artistic skill to achieve a high-quality, visually appealing result.

Last is natural stone, which is extremely heavy (thus requiring a suitable foundation, as with brick) and requires a highly skilled installer (even more so than with manufactured stone). In addition, if the stone you want is not indigenous to your local area, you’ll pay premium shipping charges to get it to your work site. It also takes much more time to install than brick or manufactured stone—because of the weight, installers must lay a couple of feet, then allow the section to fully set up before continuing with the next section. A project that takes just a few days with brick or manufactured stone will take weeks with real stone. Thus, its only real advantage is the ephemeral satisfaction of knowing that it is indeed “natural”.

What about numbers? Each project is different and will require a quote from a qualified installer. That said, here are some broad price ranges:

Material Basic Material Cost Installed Cost
Brick $2.00 - $3.00 per sq ft $5.00 - $6.00 per sq ft
Manufactured Stone $3.85 - $4.50 per sq ft $8.50 - $11.50 per sq ft
Natural Stone $2.50 - ??? per sq ft $12.00 - $20.00+ per sq ft

I like the “stacked stone” look. Do I have to use a grout line with your products?

Using a grout line produces a traditional, more formal look, while the drystack (i.e., no grout line) technique produces a more rustic look that is very popular these days. Our Cobblestone, Hackett, and Ledgestone styles can be installed with or without a grout line according to your aesthetic preference. Our QuickFit product can only be drystacked. Our Fieldstone and River Rock styles cannot be drystacked due to the shape irregularities inherent in these styles.

Do I have to put on a scratch coat before I start installing the stone?

A scratch coat is a thin layer of masonry mortar that is applied to the lath wire and allowed to dry overnight. This creates a hard, flat, smooth surface to attach the stones to. While there is no universal agreement on the necessity of a scratch coat, most professional installers use one. A good reason for this is that sometimes the lath can buckle if it is not secured very snugly to the wall surface, and if it does buckle, the movement can cause a newly placed stone to fall off the wall. Another reason is that it can be difficult to place stones—especially the Ledgestone style units—in those areas where two pieces of lath overlap. So the scratch coat can make the installation process go a bit more smoothly, but as far as the structural soundness of your project is concerned, a scratch coat is really optional.

How long does it take to install?

Manufactured stone installation requires a bit more time than brick, but substantially less time than natural stone. As a general guideline, a seasoned installation professional can cover about 100 to 150 square feet of surface area per day.

How far out from the substrate does the completed stone surface extend?

Our stones average about 1¼ inches in thickness, plus or minus about ¼ inch. By the time you get the felt paper, the lath, the mortar, and the stones attached, the total thickness of the completed stone surface is about 1¾ to 2 inches deep.

How does manufactured stone hold up over time?

The product is just about as durable as any surfacing product you can buy. Our stone products are designed to provide many years of service with no noticeable discoloration or surface texture degradation. We are so confident in the quality and soundness of our products that we offer a 50-Year Limited Warranty.

Are there any special maintenance requirements?

No, our products are designed to be essentially maintenance-free. You would maintain them the same way you maintain brick or stone—with an occasional wash to remove surface dust and debris.

Do I have to apply a sealer to your products?

Because our product is made of concrete, it will absorb water just like any other concrete surface. Over time, the repeated absorption of water in a freeze/thaw cycle may potentially cause permanent damage to the stone. A sealer generally helps to close the pores in the concrete, thereby repelling the water rather than allowing it to be absorbed.

Since manufactured stone is reserved for use in vertical (wall) applications, water and ice usually don’t have the chance to sit on the surface long enough to cause a problem. Stone laid at ground level, however, may be at greater risk.

Is a sealer an absolute must? Our experience leads us to believe that it is not. Is it a good idea? In implementations where standing water could potentially cause a problem, it may be a good idea. However, our research indicates that certain impregnating, hydrophobic sealers may actually LEAD to damage from freeze/thaw cycles, so you must be very careful when reviewing your options.

If you elect to use a sealer, industry standards recommend that you always use a high-quality, breathable (i.e., non-filming) masonry sealer in strict accordance with the manufacturer’s instructions. And be sure to test your sealer on a small portion of our stone to ensure that the final appearance is what you’re looking for.

Can I use your products on wall areas adjacent to swimming pools?

Our products will hold up at least as well as any other high quality, lightweight concrete material in this application. If you wish to use our products in this type of application, we recommend that you apply a breathable masonry sealer to the finished surface. However, please remember that any material—concrete or natural—will eventually fade due to continued exposure to chlorine and other chemicals. We do not recommend using our products in salt-water pools, as the salt has been known to wear away the surface of manufactured stone.

If I bring you a mold, will you make a custom piece for me?

Over the years, many of our customers have asked us to make “specialty” pieces by pouring our concrete into custom molds that they provide. We are a bit reluctant to do this, because we don’t have the expertise needed to guarantee a desirable outcome for the customer. But we don’t like to tell our customers “No” without even trying, so we generally accept the assignment with the understanding that the customer is 100% responsible for the outcome. This means we will not process a refund of the purchase price if the customer is dissatisfied in any way. If you’re thinking of asking us to make a special piece for you, here are some things to keep in mind:

  1. We cannot provide guidance to you on how to make your mold, because we simply don’t know how to make molds. Further, we will not modify your mold in any way once we receive it.
  2. Your molds should not be very large or very thin. Our concrete weighs about 10lbs per square foot, so large pieces will be extremely heavy, and are far more likely to break in transport or handling.
  3. We cannot provide any special ingredients or processes to enhance our standard concrete mix, because we have no expertise in mix design. If you want us to fortify your piece, you must provide the materials and instructions.
  4. Our concrete mix is relatively wet, but little air pockets (i.e., “bug eyes”) may form on the top of the piece anyway. We try to jiggle the mold as best we can while we are pouring the concrete, but we can’t guarantee a flawless finish.
  5. We will not de-mold your piece once the concrete has set up. You may de-mold your piece at our shop if you like. You may also wish to leave the piece in the mold to guard against breakage during transit.
  6. You must allow the piece to dry completely before making any assessments with regard to coloration. The curing process may take several days.
  7. We can’t guarantee your satisfaction. If you don’t like the piece, or it breaks, or it’s not just exactly right for whatever reason, there is nothing we can do about it other than assure you that we did our best.

If all this sounds like more risk than you’re willing to take, we don’t blame you one bit! That said, we have had many excellent outcomes where the customer was thrilled with the finished piece. So, if you’re game, we’ll give it a shot.

What is your color matching service all about?

While Impressions in Stone offers about 4 dozen standard color schemes, customers often have their own ideas when it comes to the perfect assortment of colors. In fact, about half of our orders feature some sort of color customization. Being able to provide this level of service is a hallmark of our business.

Before we get started, please note that the ONLY characteristic we can attempt to match is color. We cannot alter our molds in any way. So if your target features sizes, shapes, and/or surface textures that aren’t close enough to those provided by our standard Stone Styles, then you should look elsewhere.

The simplest customization is where you work with us in our showroom to select existing color elements from our standard color schemes into a new combination. This works very well for the vast majority of cases, and it costs you nothing unless you want us to prepare a sample run of that combination for you.

But if you need color elements that we don’t happen to have in our showroom, then it gets tricky. Matching colors is not as easy for us as it is for the paint guys at Lowe’s or Home Depot. We don’t have computers that can analyze color densities and automatically prescribe a perfect recipe. Instead, we have to go through a “trial and error” process, and of course we have to charge you for it. So, if you need something special, be prepared for a lengthy—and possibly expensive—process:

  1. You must provide us with an adequate “target” for the match. The best target is a physical sample of each color element you want in your custom grouping. A physical target greatly speeds up our process and ensures a much closer match. Photographs are lousy targets. If the lighting is off, or you use an inadequate camera or resolution setting, or you aren’t a very skilled photographer, then the picture will almost certainly not present the colors properly. For example, if the photo is taken in bright sunlight, all of the color elements will take on a “sunlit” hue that completely obscures the true colors. Consequently, we are extremely hesitant to accept the challenge of matching a photograph.
  2. If you can’t provide an actual physical target, then you may be able to provide a “proxy” instead. For example, customers have brought us paint chips that they believe closely resemble the color elements they are trying to achieve. So you don’t necessarily need to bring us pieces of stone or brick.
  3. Unless your project is extremely large, we will not travel to a “location” that represents your target.
  4. We will only accept a custom color matching opportunity if we believe we can achieve a close match. However, getting an EXACT match is highly unlikely. If subtle shade variations are too imprecise for your requirements, then you should look elsewhere.
  5. Once we accept, the minimum order for each color element you wish to match is 15 square feet. So if your custom grouping includes 4 color elements, you will have to purchase at least 60 square feet of finished product. We cannot guarantee that we will hit the target on the first try, and we will have to charge you for each iteration that is relatively close to the target. But the good news is that you can incorporate everything you pay for into your completed project.
  6. Each color element that we make must be allowed to dry completely before it is ready for you to review. Please plan on several days drying time for each color element in your grouping.
  7. Custom groupings, including both sample and full production runs, are non-refundable. Why? Because we can’t present custom color groupings in such a way that prospective customers fully understand what they are buying. This makes it all but impossible to sell your custom grouping out of stock. So you must bear all of the risk on your own shoulders.

If all this sounds like a big headache, well, it is! But we have had many excellent outcomes where the customer was thrilled with the finished product. So, if you’re game, let’s talk.

Can you alter your molds so that the stones look just the way I want them to?

Customers often ask this question when they want us to match an existing natural stone project. While we have a lot of flexibility with regard to coloration, our stone molds cannot be altered in any way. So please make sure that you are completely satisfied with the shape, size, and surface texture of the Stone Style you select before you make your purchase with us.

Also, we cannot provide a limited selection of the size, shape, or surface texture range provided within our mold sets. For example, there is no way can only provide only the “Large” sizes from our Cobblestone set. If you want only a limited selection of stones within a given stone style, then you may separate out those items prior to installing them at the job site.

When will my order be ready?

Until we fully schedule your order, we don’t know when it is likely to be ready. However, we use historical facts to help us make a pretty good guess. For example, if your order is fairly simple, then there is about an 80% chance that it will be ready within 2 weeks.

But please remember, this is only a guess. If your order is large, or if it features a lot of accessory products, it could take longer. Also, if the molds for your Stone Style are already being used, we may not be able to start producing your order right away.

If you have a specific target date in mind, please let us know. We will do everything we can in the scheduling process to meet that date.

Ordinarily, our Production Manager will fully schedule your order the day after you place it with us. We schedule orders on a “First In, First Out” basis, and we will not “bump” your order to satisfy another customer without your permission.

If you’re curious about the status of your order, you can call us back the next day to see when we think it will be ready. But please understand, we can’t guarantee that any order will actually be ready on a specific future date. We sometimes make mistakes that may cause your ready date to slip, so please don’t make any “hard and fast” plans around our prediction.

If your project is so time sensitive that we MUST complete your order by a specific date, we will need to proceed cautiously. Go ahead and place your order with us by making a 50% down-payment, and we will get back to you as soon as we know the projected completion date. As long as we have not begun making your stone, you will receive a 100% refund if we can’t meet your deadline.

What is this white stuff on the top of my stone?

This is known as “efflorescence”. It is basically salt that migrates out of the cement matrix to the surface when certain ambient conditions are present. We have noticed that efflorescence is much more likely to occur on exterior projects in cool, moist conditions during the fall and winter months.

Efflorescence is a common occurrence in the masonry trade. Cinder block, brick, and natural stone surfaces can all effloresce, as demonstrated in the photos below. Since all masonry surfaces are susceptible, the phenomenon may have more to do with the implementation methodology—namely, the use of mortar—than with the manufactured stone product itself. Most mortars contain a fair amount of Portland cement. This increases the likelihood that the mortar itself may effloresce, with deposits accumulating on masonry unit surfaces.

That said, the problem is particularly noteworthy within the manufactured stone industry. We’ve seen efflorescence on many projects, including those featuring stone made by our higher-priced competitors. Based on this observation, we conclude that the problem is not related to a lack of quality control in the manufacturing process. We do use both primary and secondary efflorescence control chemical admixtures in our concrete mix, but these cannot eliminate the problem entirely. To our knowledge, there is no sure-fire method of eliminating it during manufacture or after the fact. We do not recommend “treating” it with any sort of chemical, sealer, or harsh cleaning process in an attempt to permanently eliminate it.

We have observed that the problem seems to be exacerbated in projects that feature cinderblock underlayments, such as retaining walls and outdoor fireplaces. As the photo below demonstrates, large quantities of efflorescence can occur on bare cinderblock wall structures. Consequently, we can’t know with certainty to what degree the problem may be attributed to the manufactured stone itself or to the underlayment.

Compounding the mystery is the fact that the scope of the problem varies greatly from project to project. While many manufactured stone projects don’t seem to effloresce at all, others may show fairly heavy concentrations. We frankly cannot pinpoint why the range of outcomes is so broad.

While it is aesthetically undesirable, efflorescence does not affect the structural integrity or the coloration of the stone units. In addition, efflorescence is not permanent, as eventually all of the salt will migrate out of the stone units. In the meantime, the next good rain shower will usually wash away the salt. Of course, if the rain shower is heavy enough, it may also loosen other pockets of salt within the cement matrices, which may bring a new layer of efflorescence to the surface.

If it doesn’t go away on its own, we recommend that you take action. Salt of any kind is caustic to all concrete products, including manufactured stone. It is not a good idea to allow the salt to stay on the surface of the stone units for extended periods of time. If you see a persistent and/or particularly heavy build-up on your stone units, use a garden hose to rinse the salt away from the surface.

Here is a link to Wikipedia’s insights on this phenomenon: http://en.wikipedia.org/wiki/Efflorescence

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