This article is about how to install a marble window sill. Generally speaking, a marble window sill will add character and personality to any window as compared to a blunt PVC window sill, but it comes at a higher price. In addition, a marble window sill will be durable, so you don’t have to change it for many years in a row, provided you clean it regularly with appropriate products. Nevertheless, the installation process is not simple, as there are a few tricks and tips you have to know before starting the project by yourself. If you read our step by step guide, you will get all the information on how to cut the marble sill and how to install it into place.
1. If the walls are made of concrete or bricks, you have to make sure the base surface is perfectly level. If necessary, poor an auto-leveling mortar to create a proper bed for the marble window sill. In order to secure the window sill, you have to use a good cement-based adhesive.
2. If the walls are made of timber frames, you have to use different materials. Therefore clean both the marble sill and the wooden base, as to remove dust particles and other residues and lock the sill into position, by using glue (adhesive designed to bond together wood and marble).
3. If you have to adjust the dimensions of your marble sill, you could use a wet saw or a grinder with a diamond blade. Irrespective of your choice, you have to work with great care as to avoid possible injuries. If you don’t have experience in working with power tools, you’d better leave this to qualified professionals.
In order to install a marble window sill, you need the following:
- marble window sill
- adhesive (glue or cement-based)
- safety gloves, glasses
- measuring tape, carpentry pencil, l-square, spirit level
- wet saw / grinder with diamond blade – to cut marble window sill
- construction bucket
- drill with mixing paddle
- use a spirit level to make sure the window sill is installed properly
- one hour, one diy-er
Preparation before installing a marble window sill
First of all, you have to make sure the base surface is perfectly level. Therefore, use a spirit level to check if the surface is level, in every direction and on the whole surface. Work with patience as to make sure you get the job done, as a professional.
If the base surface is not level, then the marble window sill won’t be secured properly, and it might move from its position. In addition, the wall must have a neat look, so make sure the corner edge of the base surface is straight and right angled.
If the surface is not level, then you have to fill it with auto-leveling mortar and wait at least one day, till it dries out completely. Use the spirit level again, as to make sure the surface is prepared for the installation of the marble window sill.
Use a margin trowel or a float, to finish the surface and to make it proper for the installation of the marble window sill.
How to cut a marble sill
In order to mark the cut line on the marble sill, you have to use a pencil and an L-square. Next, you have to measure the needed length by using a tape measure and draw the cut line on the marble sill.
Smart tip: by using the L-square, you make sure the line is right angled and the cut will be accurate.
Next, we have to cut the marble sill by using either a wet saw or a grinder with a diamond blade. Before making the actual cut, you have to lock the marble sill into position, as not to move during the procedure. Therefore, you could lock it to 2 horse-saws with several C-clamps or ask another person to assist you.
Next, make the cut with the power tool, being attentive to go over the cut line. We strongly recommend you to use safety glasses and a respiratory mask, as to protect yourself against the dust.
How to install marble sill
You have to install the marble window sill on the base surface and tap it gently with a rubber hammer. If you use a cement based adhesive, you should spread it with a notched float.
You have to use the spirit level, as to make sure the marble window sill is installed properly. Look carefully around the edges of the marble window sill, as to avoid gaps or misalignments.
On the other hand, you could secure the marble window sill by applying glue. Therefore, you have to lay the adhesive in straight lines, every 2”/5 cm or so, as to lock firmly the sill into position.
Smart tip: try to apply the adhesive as uniformly as possible, as otherwise, the window sill might detach from the base surface. In addition, place at least two heavy items on the sill to enhance the bond.
After the mortar bed has dried out, you have to caulk the window sill, as to fill the gaps and to give it a neat look. Therefore, you have to buy a good sealer and apply it around the window sill. Afterwards, use a wet towel to clean the excess caulk, otherwise it will be quite hard to do it later.
Next, you have to finish the wall under the window sill, by applying putty with a large trowel. You don’t have to mix a large quantity of putty, therefore you could just use a small bowl. If we don’t speak of a new construction and if the gap under the marble sill is small (under 1/2”), you could fill it with caulk, and paint it later on.
A marble window sill is an exquisite feature for any room, therefore make sure you follow our steps and install it in a professional manner.
Last but not least, after we have finished the areas around the marble window sill, we cleaned thoroughly the surface. You can see in the image that installing a marble sill worths the money, especially that it will last more years than a wooden sill.
We recommend you to enjoy your new marble window sill and clean it regularly with appropriate products, as to keep its shine.
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