Maya Ellison
Installing a plastic window sill is a simple DIY task that can be completed in a few hours. Before beginning, ensure you have all the necessary tools and materials to hand. First, cut the sill wrap extrusion 1-2 inches longer than the sill itself, then cut a notch in the sill piece to fit around the brick moulding on each end. Next, insert the sill into the groove at the window, ensuring an angle of at least 5 degrees to allow for water runoff. Seal the side finishes with silicone or acrylic, and remove any cement or plaster residue. Finally, check for leaks to ensure the installation is complete.
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What You'll Learn
Prepare the area and tools
Preparing the area and gathering the right tools are crucial steps in successfully fitting a plastic window sill. Here is a detailed guide to help you through the process:
Protect the Area
Before starting the installation, it's important to take steps to protect the surrounding area. Cover the working area with a protective mat or sheets to avoid damage from flying fragments. This is especially important if you are working with wooden or aluminium frames that are vulnerable to scratches. If you are working with uPVC models, it is still a good practice to cover them or even remove them from the hinges to avoid any accidental damage.
Gather the Necessary Tools and Materials
Ensure that you have all the required tools and materials ready before beginning the installation. This includes items such as a razor knife, a crowbar or prybar, a chisel, a hammer, a brace, a measuring tape, a saw, and any other specific tools mentioned in the installation instructions for your particular window sill. Having everything within reach will make the process smoother and help you avoid any last-minute hassles.
Prepare the Window
If you are installing an interior window sill, you will likely need to remove the existing casing or trim. Cut the caulk line around the casing and the window sill with a razor knife. Use a crowbar to carefully pull out the casing, making sure to brace against the wall to avoid denting the drywall. Slowly pry up the sill with a prybar or chisel, and keep it intact to use as a template for the new sill. Inspect the frame for any rot or mould, and address it by cleaning, treating, or seeking professional assistance if the damage is extensive.
Measure and Cut the New Sill
Measure the sill area and cut the new plastic window sill to size. It is recommended to dry fit the new sill several times, as walls may not be completely straight. You may also need to cut notches in the sill to fit around any brick moulding or other unique features of your window. Take your time with the measurements and cuts to ensure a precise fit.
Choose an Adhesive
Select an appropriate adhesive that can withstand the weather conditions your window sill will be exposed to. Extreme weather adhesives, such as Dynaflex 230, are recommended to prevent the vinyl from coming loose. Apply the adhesive generously to ensure good adhesion, and use a waste block when tapping the sill into place to avoid dents.
With these preparatory steps completed, you will be well on your way to successfully fitting your plastic window sill. Remember to refer to any specific instructions provided with your window sill product and always prioritize your safety when working with tools.
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Remove the old sill
Before installing a new plastic window sill, you must remove the old one. Here is a step-by-step guide:
Prepare the work area
Cover the area with a protective mat to avoid damage from flying fragments. If necessary, cover the window with sheets or protective foil to prevent scratches or other damage.
Cut the caulk line
Use a razor knife to cut through the caulk line surrounding the window sill and casing. Be sure to get the full line.
Pry out the casing
Use a crowbar to gently pry the casing away from the drywall. Be careful not to dent the drywall; use a brace against the wall for support if needed.
Use a pry bar or chisel to slowly lift the sill out of its frame. A hammer can also be useful here. Try to keep the sill intact so that you can use it as a template for the new one.
Cut the sill into manageable pieces
If the sill is difficult to remove, try cutting it into smaller pieces with a reciprocating saw. Cut through the nails holding the sill in place, then carefully pull out the pieces.
Clean the area
Once the old sill is removed, clean the area of any debris, loose material, or protruding nails. Inspect the underlying structure for any damage or rot that may need to be addressed before installing the new sill.
Now that the old sill has been removed, you can prepare and install the new plastic window sill.
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Measure and cut the new sill
To measure and cut the new sill, start by removing the old sill carefully. Use a razor knife to cut the caulk line on both sides of the casing and the window sill. Then, use a crowbar to pull out the casing from the drywall, making sure to brace against the wall to avoid denting the drywall. Slowly pry the sill up with a pry bar or chisel, and keep it intact to use as a template for the new sill.
Once the old sill is removed, inspect the frame for any rot or mould. If there is minor mould or rot, clean, repair, or replace the affected areas and use a product to stop further rotting. If there is major rot or you cannot find the water source, seek professional help, as the window and frame may need replacement.
After addressing any rot issues, fill any gaps to ensure an airtight seal. Measure the sill area, using the old sill as a template if possible. Cut the new sill to size, allowing for any notches or adjustments needed to fit around the window frame. For plastic sills, a simple plastic cutting tool can be used. If you're working with wood, a glued-up board of ash is a good option, as it's dense and doesn't expand too much. Chamfer the edges before installing for a stronger hold and a nicer finish.
Before installing the new sill, dry fit it several times, as the walls may not be completely straight. Also, ensure that the joints are sealed airtight to prevent leaks.
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Install the new sill
Installing a plastic window sill is a simple DIY task that can be completed in a few hours. Before you begin, ensure you have all the necessary tools and materials to hand. Cover the working area with a protective mat to avoid damage from flying fragments.
To install the new sill, first, cut the sill to size. It's important to measure accurately and cut the sill slightly longer than the opening, so it extends on the sides and front of the window opening. Cut notches on the sides of the sill so that it fits within the frame. You can use a circular saw, chop saw, or jigsaw to cut the sill, depending on the material.
Next, insert the sill into the groove at the window. Adjust it vertically using a balance and washers to ensure it is level. Attach the accompanying washers and vapour-resistant jointing. The sill should be installed at an angle of no less than 5 degrees to ensure that water runs off smoothly.
Once the sill is in place, seal the side finishes with silicone or acrylic. Apply an extreme weather adhesive to ensure a strong bond that can withstand sub-freezing temperatures. Finally, remove any protective foil and check for leaks. Ensure that there are no gaps or openings that could allow water to run inside the house.
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Seal and finish
Sealing and finishing a plastic window sill is a crucial step in the installation process, ensuring the window's functionality and longevity. Here are the detailed steps for sealing and finishing:
Sealant Application:
Before installing the window sill, it is essential to seal the joints to make them airtight. This can be done using appropriate sealants like construction foam, cement, or adhesives. Ensure that the sealant is applied evenly and allowed to dry completely before proceeding.
Sill Installation:
Once the sealant is dry, carefully insert the plastic window sill into the groove at the window. Use vapour-resistant jointing and accompanying washers to secure the sill in place. Ensure that the sill is installed at an angle of no less than 5 degrees to allow for smooth water runoff.
Sealing the Sides:
After installing the sill, seal the side finishes with a suitable material such as silicone or acrylic. This step ensures that the edges of the sill are protected and watertight, preventing water infiltration. Allow the sealant to cure completely according to the manufacturer's instructions.
Finishing Touches:
Before considering the job complete, it is crucial to inspect the entire installation for any leaks or defects. Remove any cement or plaster residues and ensure that the protective foil is taken off. Check each component for constant quality, especially if you have installed multiple sills. Small mistakes or overlooked steps can lead to leaks and water damage.
Additional Considerations:
If you live in an area with extreme weather conditions, consider using a window sealing kit to prevent drafts and heat loss. Additionally, for aluminium-framed windows, be aware that they are prone to condensation, which can lead to water stains on the sill. You may need to explore alternative solutions like marble, stone, or ceramic glued to the window sill to address this issue.
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Frequently asked questions
The average mounting time is 30 minutes, but this will increase if you plan to install more than one sill.
No, you can install a plastic window sill without professional help. However, if you discover major rot during the installation, you may need to consult a professional.
You will need a razor knife, a crowbar, a brace, a prybar or chisel, a hammer, a saw, a measuring tape, and nails or brad nails. You should also have a protection mat to cover the working area and a sealant to hold the cap in place.
First, cover the working area with a protection mat to avoid damage. Then, remove the existing window sill casing by cutting the caulk line with a razor knife and pulling out the casing with a crowbar. Next, use a prybar or chisel to slowly pry the sill up. Measure the sill area and cut the new sill to size, dry-fitting it several times. Finally, install the new sill using nails or brad nails and reattach the casing.
You can use PVC (vinyl) to cover an old wooden window sill.
