Stone sills – basic informations

Everything you need to know about stone sills

Different things are produced from natural stone: from worktops through stairs to wall linings. However, natural stone is also perfect for window sills. Why? Because it is extremely robust and resistant to high temperatures, moisture and mechanical damage. Adequate stone types for window sills, installation aspects and appropriate thickness of material, all of this is discussed later in this article. Have a nice reading!

Stone sills – useful information

  1. We recommend to make interior window sills from granite, which is a hard and robust stone. It is most resistant and at the same time least water absorbing from all stones available on the market. It is stain and streaks proof so it will look look perfect for a very long time. You can also use marble. You should remember however, that it is much more prone to staining and absorbs water so it will need prior impregnation. The same thing pertains to travertine. It is much more porous, so the water penetrates its structure with ease. Having said this, we also recommend protecting it with a impregnating agent.
  1. In case of narrow windows, the sill should be at least 2 cm thick. In case of wider windows, it should be at least 3 cm thick. Of course these are not fixed standards, the products may be much thicker, but you should consider the fact that the thicker they are, the more expensive they get.
  1. Usually, installation of stone sills does not require use of additional brackets. They are only used when 2/3 of the sill stick out beyond the window recess. In such case the brackets are necessary in order to ensure stability. Of course the product has to be slid under the window frame and wedged on both sides in the side openings of window recess. If need be, you may have to cut out holes or recesses in the wall.
  1. It is possible to stand on a properly installed window sill, for instance in order to hang the curtains. If 2/3 of sill’s width have an appropriate support, such as wall or brackets, nothing wrong will happen.
  1. You can put plant pots on stone sills, but you should make sure they do not have sharp edges that could leave scratches on perfectly smooth surface. Liquids should not be left on stone sills – they need to be removed immediately. Special pads or mats are a very good solution, because they minimize the risk of scratches, that may emerge when the pots are moved.


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