Cultured Marble & Granite Table Tops

Cultured Marble & Granite Table Tops

A simple cast product with more demand than most shops can fill.

New York City still has well over 1,700 coffee shops across the five boroughs. If each one averaged just 10 tables, that is 17,000 tops that stain, chip, fade, or simply look tired.

Coffee shops are only the easy example. Hot-dog stands, burger joints, taquerias, fast-food counters, and full restaurants outnumber cafés by a wide margin.

A factory that can turn out durable cultured stone tops does not have to hunt for work.

Proof of use, not just a pitch

Cultured granite tops in a high-traffic food court. Same mix, same stain resistant finish, repeated across round and square tables.

 

Close-up of a cultured granite top in service at high-traffic DFW airport — sealed face, eased edge, easy to clean.

Why this product turns cash quickly

Making cultured marble, granite, or onyx table tops is one of the simpler cast-polymer jobs. Setup and labor stay low. Material cost is predictable: measure the area, then run the mix through a material-cost spreadsheet.

Quick area math for a round top

Area of a circle: $A = \pi \times r^{2}$A=π×r2. Radius is half the diameter.

36-inch diameter mold
Radius = 18 inches
$3.14 \times 18 \times 18 = 1{,}017$3.14×18×18=1,017 square inches
$1{,}017 \div 144 = 7.06$1,017÷144=7.06 square feet

At 8 pounds of matrix per square foot: $7.06 \times 8 \approx 56.5$7.06×8≈56.5 pounds of mix.

What that mix actually costs

Matrix cost moves mostly with resin. In the U.S., resin often runs about $1.50–$1.75 per pound, which typically lands the finished matrix around $0.59–$0.66 per pound.

56.5 lb × $0.60 = $33.90 in raw materials for a 36-inch top.

That is the number that matters: a commercial top with a few tens of dollars in matrix, sold against a much larger replacement or new-build price.

For the full mix breakdown, see Determining Your Material Cost article.

The takeaway

Table tops are a high-volume, low-setup product. One city of cafés already implies thousands of worn surfaces. Add restaurants, diners and outdoor seating areas and a shop can stay busy on this SKU alone.

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Determining Your Material Cost

Material Costs for Cultured Marble Production

Material cost is one of the most important factors in evaluating the economics of a cultured marble manufacturing operation. In a properly formulated cultured marble matrix, polyester resin represents approximately 25% of the matrix by volume. Despite this relatively small percentage, resin is by far the largest single raw-material expense and should therefore be the starting point when establishing production costs.

Polyester resin pricing varies by market and purchase volume. Worldwide, typical resin pricing falls within the range of $2.00 to $3.50 USD per kilogram. In the United States and Canada, resin is customarily quoted by the pound, with normal market pricing generally ranging from $1.55 to $1.70 USD per pound. Most other international markets quote resin on a kilogram basis. Purchase volume has a significant effect on the final cost. A manufacturer purchasing a full 20-foot container directly from the resin producer will obtain a substantially lower unit cost than a manufacturer purchasing smaller quantities through a distributor.

The remaining approximately 75% of the matrix consists primarily of crushed limestone or calcium carbonate filler. Limestone is an abundant and widely available mineral, making it one of the least expensive components of the formulation in virtually every manufacturing market. Although filler represents the majority of the matrix by volume, its contribution to the overall material cost is relatively small. In a typical formulation, filler accounts for only approximately 10% of the total matrix material cost.

In addition to resin and filler, a complete material-cost calculation must include the various consumables required for production. These include gel coat, which provides the finished surface with a non-porous, stain-resistant barrier; mold-release waxes; tooling clay used to establish radii and transitions; tape used with divider bars; pigments; and other miscellaneous production consumables.

Actual consumable usage varies according to product design, production volume, and manufacturing practices. For estimating purposes, however, an allowance of 20% of the combined resin-and-filler cost provides a reliable and practical representation of these additional material expenses.

Once the current resin and filler unit costs have been established, the accompanying Excel workbooks provide a straightforward method for calculating the resulting matrix material cost. Calculations are provided in both kilograms and pounds, with all costs expressed in U.S. dollars.

Each workbook contains two worksheets. To access the second worksheet, simply select the appropriate tab located at the bottom of the Excel file.

Adding a Manufacturing System to an Existing Cultured Marble Factory

Adding a Manufacturing System to an Existing Cultured Marble Factory Will Pay for Itself Many Times Over

After visiting and evaluating cultured marble manufacturing facilities for many years, I have seen firsthand the difference that a properly engineered mold-handling and storage system can make.

I continue to encounter established manufacturers—some of which have been in business for decades—that still move and store their molds manually. In my experience, this is one of the most significant sources of unnecessary labor, wasted floor space, production congestion, and lost manufacturing capacity in a cultured marble plant.

A properly designed conveyor and mold-storage system changes the way the entire factory operates. It reduces unnecessary handling, creates a controlled production flow, makes better use of vertical space, and allows the same workforce to produce substantially more product.

The return on this type of investment is not theoretical. I have seen the results firsthand in operating cultured marble factories, and in the right application, the equipment can pay for itself remarkably quickly.

Labor Savings

The equipment shown in the accompanying photograph was installed at a cultured marble factory a little over a year ago.

The shop manager told me that the improvement was immediate. Before the system was installed, the factory was working until Friday to complete the same amount of production that they were subsequently able to complete by Wednesday.

That represents a remarkable reduction in the labor required to produce the same volume of product.

Consider the economics. If a manufacturer can produce the same amount of product with even one fewer employee, the resulting annual labor savings could be sufficient to recover the cost of the equipment within approximately one year.

The effect becomes even more significant in a larger operation. For example, if an eight-person production crew can achieve the same daily output with six employees, the savings in direct labor alone can be substantial.

The important point is that the equipment does not simply eliminate unnecessary movement—it makes the entire manufacturing process more efficient.

Increased Production Capacity

The same factory is now producing approximately 35% to 40% more cultured marble products than it was producing before the equipment was installed.

This is particularly important for established manufacturers that have reached their practical production capacity.

I frequently encounter cultured marble shops that have stopped accepting new customers because they simply cannot produce any additional product with their existing manufacturing process. In many cases, the limitation is not the size of the building or the number of molds. The problem is the inefficient movement and storage of those molds throughout the factory.

A properly designed mold-storage and conveyor system can substantially increase the number of molds that can be processed each day without requiring a corresponding increase in floor space or labor.

In some facilities, the increase in effective production capacity can be dramatic. Depending on the existing layout and manufacturing procedures, doubling production capacity is not an unrealistic objective when a poorly organized manual process is replaced with a properly engineered manufacturing system.

Even a 20% increase in annual production can have a profound effect on profitability and may, by itself, justify the investment in the equipment.

Space Savings

One of the most significant advantages of a properly engineered mold-storage system is the amount of production floor space it can recover.

The photograph below provides a good example. Instead of placing molds throughout the factory floor, the molds are stored vertically in a five-level rack system. This makes it possible to maintain a substantial mold inventory while using only a fraction of the floor space that conventional floor storage would require.

(Five-level mold-storage rack system. This system provides approximately 2,400 square feet of horizontal mold-storage capacity while maintaining a compact and organized production area. Molds are vertically stored, identified, and readily accessible for movement through the manufacturing process.)

Each level of a rack section provides approximately 96 square feet of horizontal mold-storage capacity. With five levels, each rack section provides approximately:

96 square feet × 5 levels = 480 square feet of mold-storage capacity

With five rack sections, the total storage capacity is approximately:

480 square feet × 5 rack sections = 2,400 square feet of mold-storage capacity

That represents approximately 2,400 square feet of horizontal mold-storage surface contained within a relatively compact rack footprint.

This is where vertical storage becomes particularly valuable. Without a rack system, these molds would have to be stored on the factory floor. As the mold inventory grows, the available production space quickly becomes congested.

The photograph illustrates the difference. Hundreds of molds can be organized, identified, and accessed without turning the production floor into a maze of molds stacked or positioned wherever space happens to be available.

More importantly, the storage racks are not simply a place to put molds. They become an integral part of the manufacturing system. Molds can be stored in an organized sequence and then moved into the production process as required.

The objective is not simply to store more molds—it is to make the entire factory work more efficiently.

Reduced Insurance and Workplace Risk

Another important consideration is workplace safety.

When molds are moved manually, employees are repeatedly exposed to lifting, carrying, pushing, pulling, and repositioning heavy molds. Eliminating these unnecessary manual-handling operations can significantly reduce the risk of employee injuries.

Once the conveyor and storage system is installed, molds can be moved through the manufacturing process with minimal physical effort. In many applications, one person can move a mold using one hand.

Reducing manual handling reduces the opportunity for strains, lifting injuries, and other workplace accidents. A safer manufacturing process can also have a positive effect on workers' compensation and liability exposure.

I recommend that manufacturers discuss the installation with their insurance carrier. Any reduction in workplace risk should be evaluated with the insurer, as the actual effect on premiums will depend on the company's underwriting and claims history.

Employee Attitude and Productivity

There is another benefit that is often overlooked when evaluating manufacturing equipment: the effect it has on the people who work in the factory.

A manufacturing facility without an organized material-handling system can become frustrating and chaotic. Molds are constantly being moved out of the way, production areas become congested, and employees spend valuable time performing work that adds nothing to the finished product.

A properly designed cultured marble manufacturing system changes that environment.

The molds follow a logical, systematic path through the manufacturing process. Employees know where the molds belong and where they need to go next. Instead of repeatedly lifting and maneuvering molds, employees can move them smoothly through the production process with very little physical effort.

The difference is immediately apparent.

When people have the proper equipment to perform their jobs efficiently, the work becomes easier, the factory becomes more organized, and employee morale generally improves. In my experience, you can see the difference in the attitude of the people working on the production floor.

The Bottom Line

Whether your cultured marble factory occupies 3,000 square feet or 20,000 square feet, a properly designed manufacturing system can produce significant financial and operational benefits.

The potential benefits include:

• Lower direct labor costs
• Higher production capacity
• Better utilization of existing floor space
• Reduced manual handling
• Lower workplace risk
• Reduced production congestion
• Improved manufacturing flow
• Better employee productivity and morale
• Lower overall manufacturing overhead

Most importantly, the equipment should not be viewed simply as an expense. It should be viewed as a productivity investment.

When the system is properly designed around the building, the production volume, and the manufacturer's specific workflow, the resulting labor savings and increase in production capacity can recover the initial investment surprisingly quickly. In many operations, the financial return continues long after the original equipment investment has been recovered.

Determining the Cost of a System for Your Factory

If you are considering adding a manufacturing system to an existing cultured marble factory, I can provide an approximate system cost based on a hand-drawn floor plan of your facility.

The following information is required:

A. Building width, length, and approximate height

B. Location and dimensions of all doors, including overhead and personnel doors

C. Location of columns, posts, or other structural obstructions within the production area

D. Any changes in floor elevation or irregularities, including ramps, different floor levels, floor drains, or other obstacles

E. Location of office and restroom areas

F. Location of the gel-coat spray booth

With this information, the manufacturing system can be designed around the existing building rather than forcing the building to conform to the equipment.

A well-designed system should work with your existing facility, improve the flow of your production, and provide a measurable return on your investment.

 

Pouring Your Cultured Marble Molds Four Times a Day

I am often asked if I can turn my cultured marble molds four times per day. Of course the molds are capable of being used four times per day but the question is, is it humanly possible or even likely. The answer is no, it’s not. Even if you could, it has nothing to do with the molds but everything to do with the raw materials and equipment you use in manufacturing. A mold’s lifespan is determined by how many cycles you turn the mold and how hot you pour them.Cultured marble is made using a polyester resin with a promoter, and various kind of fillers such as limestone, granite and onyx. A catalyst is added to the mixture which reacts with the promoter in the resin, making the cultured marble cure.Several factors determine how fast your cultured marble hardens and how many times per day you can turn your molds.Promoters: Promoters are generally added to the resins by the resin manufacturers. There are different kinds of promoters, so not only the amount of promoter but what type of promoter they add will affect the cure time. The more promoter that is added, the faster the cure time will be.

Catalyst: The more catalyst you add the faster your marble will cure. There are also several different brands of catalyst and some of these are designed to give you a faster cure time. There are some products, such as bathtubs, where you don’t want to catalyze too much because over calalyzing can generate too much heat.

Climate: Heat is your friend in manufacturing cultured marble. Your cure time can be shortened a great deal with some heat. The warmer your climate is the faster your cure time will be. The faster the cure time, the sooner you can get your part off the mold and start the process over. Under ideal conditions (like a hot summer day) you may be able to get a marble product cured sufficiently to demold in a couple hours but in the wintertime, you may have to let the product sit on the mold four hours or more to cure enough to remove it from the mold.

Equipment: A heat tunnel (Equipment) is an important factor in turning your molds more times per day. You have to spray gel coat on your mold prior to pouring your cultured marble matrix on it. This gel coat has to be cured prior to pouring your cultured marble. Running this gel coated mold through a heat tunnel as you see in the photo below, drastically shortens this gel coat cure time. Heating this gel coat can cut the gel coat curing time by half or more, especially in a cold climate. In a cold climate, it is not uncommon to have a gel coat cure time of 45 minutes to one hour, and a heat tunnel can cut this time down by 50 to 60%. Having the mold warmed up during this process will also cut down your cultured marble gel and curing time considerably.

Now that you have learned some tips on how to ‘work towards’ turning your molds four times per day, let me say that it is unlikely that you will ever turn your molds four times per day regardless whose molds you use or how much experience you’ve gained working with the raw materials. It’s just not realistic to expect that in an eight hour day, you can setup a mold (divider bars), wax it, wipe off the wax, spray your gel coat, let the gel coat cure, pour your cultured marble, let the marble cure, de mold your part, and go through this process three more times in a regular eight hour day. Pouring your molds two times a day is feasible, so when you’re putting together your business plan, figure the maximum times you turn your molds will be two times per day. When you have all the facts and details, you will find that you can put together a very attractive P/L statement by planning on turning your molds only once per day, as most cultured marble factories do. If you have more questions on this, give me a call at (408) 230-3616 or e-mail me at doyle@culturedmarblemolds.com.

There is also a lot of facts on the Frequently Asked Questions (F.A.Q.) page at:http://www.culturedmarblemolds.com/cmmfaqs.html.

Using Templates for Installing Cultured Marble

The other day a new marble factory asked me the best way to go about making a rather complicated cultured granite bathroom countertop. It was going to be a large ‘L’ shaped, corner vanity top, and it would have a couple of inside and outside radius on each back wall. The customer wanted a 45 degree angle on the front inside corner, and they would have to use a Hexagon Floating Bowl on each side of the ‘L’.

The solution was simple enough and one that many take for granted and use every day. But, if you’ve never seen it done, this trick may never have occurred to you. I’ve seen cultured marble shops try to lay out parts on their wall panel mold using cardboard, paper, etc., with some pretty disastrous results.

I went through my files of photos and found a couple of reasonably clear photos of a template. I e-mailed that to him with directions on how I make a simple template and how to use it, and he found making that unilav countertop was a ‘piece of cake’.

To make the template, go to your local Home Depot kind of store and buy some ‘door skin’. It is a 1/8" thick veneer type of material that comes in sheets about 4' X 8'. Cut them into 3" or 4" wide strips on a table saw.

You will need to make a template on the job site where the actual part will be installed. I use a template most often when I need to pour an irregular shaped piece of cultured marble on the Wall Panel Mold and occasionally on the All Purpose Mold. The most common uses are probably going to be to produce irregular shaped bathroom vanity tops, bathtub decks, or pieces around a shower pan, but once you realize how much time you can save and how much more accurate you can produce your parts, you will start using them all the time.

For example, let’s say you need to make a fairly simple ‘L’ shaped corner unilav countertop like the picture here that I took at Angel Marble. When the cabinets are in place, lay a strip of your template material horizontally along the back, left wall, making sure it is fitting into the corner. Take another strip of your template material and lay it on the cabinet along the right hand wall. Where those two template pieces overlapped in the corner, staple them together.

I like to use a T-50 Arrow staple gun with 3/8" long T-50 Arrow Staples. The 3/8" long staples are perfect because the total thickness of the two overlapped veneer pieces will total of 2/8", and the extra 1/8" is long enough to enter into the cabinet to hold your template in place. And, only going into the cabinet 1/8" is not so deep and you can’t easily lift your template off the cabinet when you’re finished.

Follow the same steps around the cabinet. Make sure you make your templates to allow for the over-hang you will want on your finished edges. Add a few cross pieces to stabilize your template. Nothing is worse than getting your template back to the factory in two or more pieces. When you’ve finished making your template, make some notes on the template to show which sides are finished edges and which will fit against the wall. Whether you’ll be using floating bowls to make a unilav or making a hole to accommodate an undermount bowl or dropin bowl, make a mark on the template where the bowls will be located.

When you get it back to the shop, place your template ‘upside down’ on your mold, staple points facing ‘up’. You can use some double sided tape to hold it in place, and using double sided tape again, tape your divider bars on the mold, against the template.

Another great use for a template is when you’re installing a shower surround. I like the idea of sellingthe inside corner trim molding for shower surrounds for two reasons. You make money selling the trim,plus, it makes installations much easier and faster. But for the time being, let’s say the customer doesn’t want the inside corner trim.

I always say ‘there is no such thing as a square wall’, (but don’t ask a framer) so the marble wall panel will have to be cut to fit the un-square wall. (This is why you’ll always make the wall panel an inch oversize, and expect to cut it to fit.) Since in this case your customer doesn’t want to use an inside corner trim mold, you’ll want no more than 1/8" gap in the corners, and the template is a perfect way to achieve that.

Let’s say you’re installing wall panels for a simple bathtub shower surround. Since the back wall should go on first, let’s do that wall. Take one piece of template and place it vertically in the corner, flat against the back wall. Put a staple in it to hold it to the wall. Place another piece of template across the bottom, resting it on the top of the bathtub. Where these two templates overlap, put in 4 or 5 staples to staple them together. Do the same on all four sides, and you’ll end up with a square template frame. Now, do the same thing to the other two ends of the bathtub where the wall paneling will be installed. When you are making the templates make sure you use a leveling tool to assure they are perfectly horizontal on the top, and make sure the end panels they are going to be exactly the same height as the back panel as well. Also, use the leveling tool to make sure the finished edges of the end wall panels are vertical. Again, put a couple extra pieces of template material across the middle of your rectangle shaped template to give them more strength and assure they won’t come apart.

Hopefully, you’ll be installing a recessed soap dish or soap/shampoo combo in the shower surround too.

You can use your templates to locate where you will cut the hole in the wall panel as well. First, make the cutout in the wall where the soap dish or soap/shampoo combo will go. Then, staple one piece of template horizontally across your template frame at the top edge of this cutout. Staple another one at the bottom of this cutout. Now, staple a template strip vertically on each side of the soap dish cutout, to the two horizontal pieces you just installed prior. You should now have the exact location where your soap dish or soap/shampoo combo will go. Make sure you identify which side of your shower surround requires the finished edge and which side will go in the corner. Obviously you will be cutting on the side that will fit into the corner and not your finished edge. (Ouch!)

Lay your wall panel on a saw horse, unfinished side ‘up’. Lay your template on top the panel making sure your staples are point ‘up’. Align your template on the edge of your two finished edges. Take a pencil and draw a line on the other two edges. These two sides are where you will cut your cultured marble wall panel to fit Mr. Framer’s un-square wall. Follow the same steps whether you’re installing a shower surround over a bathtub or on a shower pan.

When it comes to tools, I’m picky. The best saw you can buy (my opinion) to cut cultured marble or onyx or granite, is the Skil Brand Model HD77, which is a 7” Worm Drive Circular Saw like the one you see in the picture. Using a carborundum blade like the one you see on the Skil saw, cut both ends off that you marked with your pencil. A really good installer can cut the panel perfectly along the pencil line and slap the panel on the wall. I don’t pretend to be a installer, so I’d make my cut about 1/16th from the line, then take a sander with a 36 grit disc, and sand up to the pencil line. I’d rather take the extra time and sand off that 1/16th of an inch all the way up the panel than to try to make a perfect cut with the circular saw and cut in past that line. That would be a bummer.

Anyway, I hope you got the gist of it. I thought I was going to do a short couple of paragraphs here, but that didn’t happen.

If anybody has any other template ideas, let me know. This is the best and most simple way to make a template that I have found.