We all know windows are essential parts of our homes, offices, farmhouses, and almost all industrial units. Without windows, our buildings might be devoid of natural daylights, air, and get the opportunity to see outside world from the interior of the building.

Whenever we go to construct a building or restoration of existing one, we used to face several questions from the contractors, masons, civil engineer or your architect regarding the windows.

It naturally triggers curiosity to know terminologies for various windows, styles, and their essential components. The window has several components, and among those, some are illustrated in the following image.

illustrated windows sills

What Is The Window Sill?

The window sill is a part of the window frame. The window frame surrounds & supports the entire window framework using different components in different directions. For instance, window head – on the top, window jambs – both sides of the window, and window sill – protect the bottom of the window frame.

In masonry or civil engineering, we cannot place the window directly on masonry construction. We need to place it over 50mm to 75mm thick cushion made from wood, stone, or RCC structure, and we call it window sill in general terminology of the construction industry.

Windows Sills

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What Is The Function of Window Sill?

The main and common function of window sill in civil engineering and architecture are protecting window frame at the bottom from weather extremity and holding the frame in place at a structural point of view.

Now, the modern buildings are using different materials to construct the window sills, such as

  • Classic style building architecture has wooden window sills with wooden window frames.
  • Classic yet decorative building constructions have a natural stone as luxurious material with several advantages.
  • Modern buildings prefer RCC slabs as window sills. However, many high-end buildings use thinner natural stone slabs laid over the RCC slab as a mix of window sill material.

Ten Benefits of Natural Stone Window Sills in Your Buildings

Today, we will discuss natural stones as window sill construction material and know ultimate ten (10) benefits of it in the current post.

Benefit No. 1 – Natural Stone Window Sill Keeps Moisture Out

Weather always is not soothing throughout the year. It may harsh in rainy and snowy days. Water and snow try to penetrate the interiors of the building. Heat waves in summer can make your home interior hot.

Benefit No. 1 Keeps Moisture Out

Now, the window is a kind of opening, which is equipped to prevent adversity of weather. Window framework consisting of a header, Jambs, and a sill can prevent intrusion of water, humidity (dampness), and hot/cold air currents.

In short, we have recognized the significance of window sill to cope with water and moisture intrusion.

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Benefit No. 2 – Natural Stone Window Sill Keeps Drywall Safe

If you don’t use window sill at all in window construction, the rainwater will seepage through pores/sews into mortar and brick construction. If you have applied Drywall, it will breakdown and leads to a growth of molds over time.

Benefit No. 2 Keeps Drywall Safe

Long-term dampness inside the wall structure might be resulting in swelling of material/components and shredding of paint layer or display rotted areas on the wall surfaces.

If the window were designed properly and with right materials like natural stones, it would prevent the passage of moisture. Of course, you need to design a drip groove beneath the exterior of window sill to drain the rainwater directly.

Natural stones have inherent capacities to prevent seepage of moisture inside, as well as let dry the window sill stone rapidly without retaining water into the mass of rock.

In short, natural stone window sills are preventing drywalls beneath the window sill from adverse impacts like rot, swells, and cracks. 

Benefit No. 3 – Natural Stone Window Sill Holds Window Frame In-place

Have you looked at the anatomy of the window closely at the bottom of the window frame? If not so, let me introduce the window sill as a sturdy structural component that can bear the load of the entire window frame at the bottom.

Benefit No. 3 Holds Window Frame In-place

Thus, the window sill is a load-bearing element in the building construction where openings have carved. Moreover, the window frame has interior and exterior framing structure with a gap in between to allow the wall to get a grip.

Here, window sill provides a common structure to lay the window on the top of vertical wall fragments. Slopped sill at the exterior of wall and stool, as well as an apron at interior side, provide a firm grip to stay window frame firmly on the wall layers.

In short, window sill prevents window from swaying & shifting if foundation settles due to wear & tear impacts or earthquake-like natural hazards.

Natural stone when used in the construction of window sills, it proves the sturdiest material to bear the load of window frame and structure above it. If you select right size and thickness of sturdy stones, you might alleviate even the construction of RCC slab beneath the window sill stone.

Benefit No. 4 – Natural Stone Window Sill Is Durable

We know that since centuries, wood and stones are naturally available material to use in window sill construction. Unfortunately, wood proves a weak material to resist weathering impacts like moisture, rot, mold, and cracks over time.

When we look at the natural stones, particularly marbles, which are highly used stones in the construction of window sills today, you will find stones the most durable material based on its physical properties.

Marbles are hard, dense, and with good compressive strength. Most of Siliceous & Calcareous Stones have minimum water absorption capacity thanks to low porosity. Stones also are heat and frost resistant compared to rests of the modern material used in window construction.

                      Physical Properties of Marbles
Hardness 3 to 4 on Moh’s scale
Density 2.5 to 2.65 kg/m3
Compressive strength 1800 to 2100 kg/cm3
Water absorption capacity Less than 1%
Porosity Low
Weather impact


Therefore, natural stone window sill provides safe space for damp plant pots, heavy ornamental components, and even seating space for a kid or an adult with adequate size & shape.

Benefit No. 5 – Natural Stone Window Sill Decorating the Exterior of Window

You have the freedom to select colors of shades like white, cream, black, brown, green, gray, and a lot more. You can set window sill with a color theme or scheme of the window and surrounding colors. Natural stones have natural beauty. It has a range of color shades. Natural grains, veins, and rock patterns are making each piece unique, alluring, and decorative.

Benefit No. 5 Decorating the Exterior of Window Benefit Exterior of Window Exterior of Window sills

You can go to pick stone types of your choice like granite, sandstone, limestone, bluestone, slate, and most importantly marbles. Crafting on stones is a known art since ancient eras. Therefore, turning imagination into reality through elegant designing is easy.

Attractive designs of stone sills are making façade of building engaging and grabbing eyes immediately.

Benefit No. 6 – Natural Stone Window Sill Decorating the Interior of Window

Interior of window sill exerts natural beauty inside the house. Today, we have enough choices to select stone slabs from a variety of stone types.

Benefit No. 6 Decorating the Interior of Window Benefit Decorating the Interior of Window Decorating the Interior of Window

Conglomerate stone slabs look the most natural. Finished granite when polishing well, it outshines the interior and bestows dazzling effects.

Marbles are an excellent choice when you think of matching the style, color, pattern, and design-based theme during interior designing.

Sturdy stone slabs give an opportunity to stone edge coping in innovative styles and designs.

Benefit No. 7 – Natural Stone Window Sill Is Easy to Maintain

Natural stones hardly get stains, retain dirt, and fade with wear & tear. Siliceous stones are tough variety so hardly get stains from liquids or grease.

Benefit No. 7 Easy to Maintain Benefit Easy to Maintain

Regular washing is easy on almost all stones. Of course, you cannot use acidic solutions on calcareous stones, but vinegar or baking soda are sober chemicals to wash stones and remove stains quickly.

Plain water washing or simple washing detergents work for regular cleaning and maintenance practices well. Natural stones never shrink, buckle, or fade in color due to weathering effects, so window sills with stones last longer than any material used.

Benefit No. 8 – Natural Stone Window Sills Are Easily Available

Today, stone quarrying technologies get advancements and suppliers, as well as endpoint consumers, are getting high-quality custom orders easily.

Benefit No. 8 Are Easily Available Are Easily Available

Moreover, improved shipment facilities have made export-import quick and cheaper than in previous decades.

Suppliers and curating units have adequate infrastructure to provide window sills of a wide range and types of stones, sizes, shapes, styles, and patterns.

Benefit No. 9 – Natural Stone Window Sill Improve Reselling Value of Property

We know well that natural stones always are increasing reselling values of property thanks to the superb attributes of stones.

Benefit No. 9 Improve Reselling Value of Property Improve Reselling Value of Property

Durability, strength, natural look-n-feel, minimal wear & tear, easy maintenance, fast restoration, and most importantly long-lasting attributes of natural stones helps to win the market and customers, even lapse of years between construction/restoration and selling.

Natural stone window sills are improving curbing impacts of the property at the exterior side while enhancing interior when chosen carefully to match with the interior design theme.

Natural stones are giving excellent impressions to the onlookers at first glance and help in winning the deals of the property.

Benefit No. 10 – Get Natural Stone Window Sill at a Budget

With the advent of shipping technologies, import-export is easy, rapid, and cheaper for natural stones. Stiff competitions and advanced services like custom order supply have made natural stone budget friendly for all economic class of people.

Online shops display tons of stone varieties for window sills in a wide range of design options as per the regional and global preferences. If you consider durability and long lifespan of natural stone window sills, you will find it quite cheaper among other alternatives including wood and RCC slabs.

Where Will You Get Reliable Supply of Natural Stone Window Sills?

World of Stones, Maryland is an ideal destination to get a huge inventory of natural stones for various exterior applications including window sills. World of Stones USA is a leading manufacturer, supplier, and importer company with extensive experiences and expertise in fulfilling custom orders at a budget.

Eco-friendly and advanced cutting, finishing, polishing, and coating of various kinds of natural stones make World of Stones a favorite place to visit online as well as in-person to get complete guidance, consultations, and high-quality material at the competitive rates.

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