Selling Marble Window Sills: How to Repair Gaps and Cracks on a Window Sill

Top 5 Materials Used for Window Sills in South Florida



If you are looking for some good sound instructions on how to repair your existing window sill, chances are you have a wooden window sill that’s seen better days. It’s either faded or discolored, peeling paint, or rotting away. While there are many ways to repair your window sills, you have to take into consideration what the cost is and how often you are making these repairs. You’ll quickly discover that the upkeep of your window sills is costing quite a bit of money.

If you are a marble distributor, this is what you need to tell your builders and contractors who are looking to buy in bulk. While they’re shopping for marble floors, you can educate them on the benefits of installing marble window sills into their builds so that they can save the buyer hundreds of dollars—something that will make a great selling point for them.

Gap In Your Window? Fix Gaps and Cracks In Your Window Sill

Due to temperature changes and simple wear-and-tear, window sills can form gaps and holes over time. Fixing those gaps can be easy by following these tips.

Gaps and Cracks on a Window Sill: How Do They Form?

The first aspect to understand about sills is that they are subject to a lot of elements. Pressure, temperature, humidity, and many other aspects are constantly being exposed to the sill. Over time, that can make the sill start to move around. In cases where the sill is made of wood, the temperature alone can make it expand and shrink. This leaves gaps behind which warm and cool air can escape through to the outside. Instead of thinking about how to replace a window, all one may need to do is repair the sill by filling its gaps and cracks.

How to Repair Window Sills

Most often, when fixing window sills, a flexible and paintable caulk should be used. This seals up holes, gaps, and cracks. If it’s not flexible, it can actually cause the sill to crack more as it responds to the moisture and temperature of the house. The reason it needs to be paintable is so it can match the surrounding area. Another aspect to consider for the caulk is whether or not it’s waterproof. Should the window ever leak or be left open in the rain, the caulk will need to be waterproof in order to last through the exposure of the moisture. Otherwise, it can be eaten away by the water. The cracks will reform or worsen.

For larger cracks, one might want to consider using an auto body filler and a full overcoat of a joint compound of sheetrock. Should cracks form again, simply repeat the process. Window sill repairment needs a professional touch. If you are a handy person, that is great! You can repair those wooden window sills multiple times until you get bored looking for solutions for the gaps and cracks. On the other hand, unless you are handy you must hire a professional. There a possibility to hire that professional multiple times as well. But we have an offer for you to make your life happier with window sills. You can replace your wooden window sill with a marble one. You will see that they are everlasting. You will never have to repair them again for a long time.

1- Remove The Side Casings From Your Window

The casing comes off to clear the way for removing old sills. If they are rusted, replace them too! Peel back caulk between your house’s exterior and its trim; then carefully pry each piece of it away from you – save any leftover wood pieces as templates if needed (a perfect use!) Make sure there is no water coming behind where all this goes before continuing on with installation instructions below.

2- Cut Off The Old Sill

For cutting the rotten sills, use a circular saw with an oscillating blade. For most of it you can get by using just your hands but for those pesky ends where nothing will fit try out some multitools. Once smoothed out carefully remove all dust away from surfaces so they don’t crack when handled again later down the line.

3- Attach the New Sill

Repair any rot on the old sill with epoxy. Trim back so that it fits tightly against siding and securely into place, then drill pilot holes every 16 inches or so through both sides of new board for adhesive. Run a bead along each edge before applying pressure to completely seal in your repair job!

Press the new sill into place and immediately clamp it with a few 3½-inch deck screws. Stop when heads of each screw are about ¼ inch below surface level, then wipe up any adhesive that squeezes out before adding another layer for extra strength or filling gaps between old and new sills if necessary.

4- Put In The Side Casing

Squeeze a bead of caulk beside the ends of siding, and nail it in place. Use proper trim boards to match home’s exterior. Apply stainless steel ring-shank nails below surface for added safety against leaks or peeling away at any time during project completion (there are also plastic wall plugs available). After both parts have hardened overnight – sand edges flush!

Restore a Wooden Window Sill

In some cases, the sill is too damaged to be fixed properly. A silicone caulk won’t do the job. Instead, one might need to restore the window sill by using wood fillers. First, one needs to cut the sill until enough of the damaged area is removed. Then use the fillers and a fresh bit of sill to replace the damaged area. One can use either silicone caulk or wood adhesive to seal up the new sill. This can fix damaged wooden window sill without needing to replace them entirely. As you see, restoring wooden window sills is not easy. Also, wooden window sills are not durable either. This is why we provide marble sills. Marble sills are enduring as well as they are attractive. In this case, you can consider replacing your wooden window sills with marbles.

Why Buy Marble When You Can Easily Repair a Window Sill?

If you install marble window sills into your build, your potential buyers can save themselves hundreds of dollars as well as the time spent researching YouTube for the best tutorial on how to fix your window sills.


If you invest in a better product, your window sills won’t crack, and if they don’t crack, there’s nothing to repair, leaving your expense account a little healthier. You’ll be able to spend your household budget on other things that can improve the value of your home. 

This is the kind of selling point that contractors need to present to any potential buyer, but they need to be able to see that it’s a better product. That means as a business owner, you need to take the risk in investing in marble quality window sills and installing them into your build. 

It’s only a risk because marble window sills generally run a little higher in cost than wooden window sills, or synthetic stones, which is why the latter is considered the standard material. So if you choose to build your windows with a material that is above standard, chances are highly likely that you’ll get a good return on investment.

Here’s Why Marble Won’t Crack Like Wood 

Marble is a durable substance that’s primarily made of limestone. It’s formed deep within the earth through a metamorphic process that actually melts the limestone along with surrounding fossils and other minerals into one molten and viscous liquid when it gets too close to the earth’s core. It eventually crystallizes as it cools. With the fossil material now embedded in the limestone, its surface now glossy and it’s the actual mass shows evidence of the metamorphosing process creating swirls and patterns of different colors that are really quite extraordinary. Through years of tectonic plates colliding due to earthquakes, this new rock called marble eventually makes its way up towards the surface where it’s close enough to mine from the earth.

Taking Labor Costs Into Consideration

Mining for stone isn’t a cheap hobby. It takes plenty of resources to extract marble. Furthermore, most marble quarries are mined overseas. That means that not only does it cost to mine the product, it also costs to import it into the country. Good, raw, quality marble is not as easy to get as one might think. While many contractors prefer to go to local home improvement stores to stock their marble inventory, keep in mind that they are most likely getting their supply from a wholesale distributor with a quarry. 

Fix Your Window Sill By Replacing Them with Something Better

Stonexchange, a natural stone manufacturer of marble window sills and thresholds supplies thousands of marble distributors around the country. Based in Miami near the shipyards, Stonexchange is strategically positioned to keep our warehouses full at all times as we import marble window sills directly from our quarry on an on-going basis.

We carry 5 specific kinds of marble that our clients have found are well received by buyers. White Carrara, Crema Sahara Marfil, Black Granite, Pure White Thazoz, Bardiglio Gray, and Emperador Brown are the most common types of marble window sills that will complement any type of décor whether you choose to install carpet, hardwood, or even vinyl.


Marble window sills are just a smart choice. When repairing a window sill yourself, if you’re not a licensed contractor, you could be compromising the structure of your dwelling, a “repair” that could cost you more money than originally intended, and quite possibly increasing your insurance premium.

A Little Can Do A Lot

It’s amazing what a small difference like upgrading your window sills with quality marble stone can do for the overall value of a dwelling.

Marble window sills are slightly different than the standard material because the likelihood of ever needing to replace it is slim. Marble is built to last. It will withstand the elements and is critter-proof. The marble window sill may very well last longer than the dwelling itself!

If you want to learn more about marble window sills and how you can be a distributor, call Stonexchange today at 305-731-2400 or contact us online. Teach your customers how to avoid repairing gaps and cracks on their window sill for good!

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