
Window boxes are a great way to add some character to your home's exterior and create gardening opportunities for homes with little to no green space. They are also a space-saving alternative to planter pots. Installing a plastic window box is a relatively easy and achievable task as long as you have the right tools and directions to follow. In this article, we will provide an overview of the tools and steps required to attach a plastic window box to your home.
| Characteristics | Values |
|---|---|
| Materials | Plastic |
| Installation Process | 1. Locate studs using a stud finder. 2. Mark stud locations. 3. Drill holes. 4. Waterproof holes with caulk. 5. Attach box with lag screws. |
| Installation Considerations | Exposure to sunlight, accessibility for watering, and window opening style. |
| Installation Surfaces | Vinyl, brick, wood, stucco, HardiBoard, or similar siding. |
| Tools and Materials | Stud finder, drill, drill bits, tape measure, level, pencil, socket wrench, lag screws, washers, plastic inserts, vinyl-siding hooks, mounting brackets, and screws. |
| Maintenance | Check for loosening or damage, tighten screws, and remove during harsh winters to prevent damage. |
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What You'll Learn

Locating the studs
When using a stud finder, you may need to swipe it back and forth multiple times to find the studs, as vinyl siding can make it tricky to use. You should press the stud finder firmly against the siding, but not too hard, and ensure it is in a perfectly straight line across. Mark the stud locations lightly with a pencil either on the window sill or directly below it. Many people put a small "S" on their sill or wall to differentiate the stud locations.
If you do not have a stud finder, you can use a hammer to tap the wall – a deep, hollow sound indicates no stud, so keep tapping until the sound changes to a higher, more solid sound.
Once you have located the studs, you can mark the height of the window box by drawing a horizontal line across the wall at the desired height. You can then mark where to drill the pilot holes in the back of the window box.
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Marking the mounting location
Identify the Studs
Use a stud finder to locate the studs on your wall. For vinyl siding, you may need to use a zip tool to remove the siding and access the studs. Mark the stud locations lightly with a pencil, either on the window sill or directly below it. You can differentiate these marks from the centre of the window by using a small "S" for the studs and a "C" for the centre.
Centre the Window Box
With the help of a partner, hold the window box up to the wall, aligning the centre mark ("C") on the box with the centre mark on the sill. Ensure that the box is centred and adjust its position according to your preference.
Mark the Stud Locations on the Box
While holding the box in the desired position, mark the corresponding stud locations on the top edge of the back of the box. These marks indicate where you will drill the pilot holes for mounting.
Determine Box Height and Draw a Level Line
Decide on the desired height for the top of the window box and mark this spot. Use a 4' level to draw a horizontal line across the wall, ensuring it is straight and level.
Mark the Mounting Bracket Positions
For double-hung or sliding windows, measure 1 inch down from the underside of the windowsill, directly below one side of the window frame. Make a pencil mark at this point to indicate the top of the mounting bracket. Repeat this process on the other side of the window, ensuring the marks are level and symmetrical. For out-swinging windows, measure down 6 to 8 inches instead to allow for proper clearance.
Mark the Drill Holes
With the window box held in place, transfer the stud marks to the box. These marks will indicate where you need to drill reference holes through the box and into the siding.
By following these steps, you will accurately mark the mounting location for your plastic window box, ensuring proper alignment and a secure installation.
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Drilling holes
Locating and Marking Studs:
Start by locating the studs on your wall using a stud finder. Trickier surfaces like vinyl siding may require using the Deep Scan mode and carefully swiping the stud finder multiple times to get accurate results. Once you've located the studs, mark their positions lightly with a pencil. You can use an "S" to indicate stud locations directly on the window sill or below it.
Determining Box Height and Drawing a Level Line:
Decide on the desired height for the top of the window box and mark this spot. Use a 4' level to draw a horizontal line across the wall, ensuring it's straight and level. This line will guide your drilling process.
Drilling Pilot Holes:
Using a drill bit slightly smaller than the diameter of your bolts, drill pilot holes into the back of the window box. Position these holes 2-3 inches down from the top of the box, aligning with the stud marks ("S") you made earlier. These pilot holes will guide your fasteners during installation.
Drilling Through Siding:
If your home has vinyl siding, you'll need to drill through it to reach the studs. Change to a drill bit that is slightly larger than your lag screws, such as a 1/2" drill bit. Drill through the vinyl siding, weatherproofing wrap, and just begin to penetrate the wood behind it without going all the way through. This process ensures that your fasteners will have a secure grip without damaging the structure.
Drilling Through Studs:
Now, switch back to a drill bit that matches the size of your lag screws, such as an 11/32" drill bit. Finish drilling through the wood stud, ensuring that your hole goes all the way through. Repeat this process for all the marked stud locations. These holes in the studs will provide a sturdy anchor for your window box.
Waterproofing:
Before attaching the window box, it's important to waterproof the holes to prevent water infiltration. Apply silicone caulk to each pilot hole, filling any gaps to create a watertight seal. This step is crucial to protect your home's exterior from moisture damage.
By following these steps for drilling holes, you'll create a strong and secure foundation for attaching your plastic window box. Remember to work with a partner and exercise caution when operating power tools. Always follow the specific instructions provided by the window box manufacturer for a precise installation process.
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Waterproofing
Prepare the Surface:
Start by ensuring the surface of your plastic window box is clean and free of any debris or loose particles. Use a brush or a vacuum cleaner to remove dust and dirt. It is important to prepare the surface thoroughly to achieve the best results.
Apply the First Coat:
Using a brush, roller, or spray gun, apply the first coat of a trusted waterproofing product, such as SEMCO's Liquid Membrane, to the surface of the window box. Ensure complete coverage, paying special attention to seams, joints, and any cracks or crevices where water intrusion is more likely to occur. Allow the first coat to dry thoroughly before proceeding to the next step.
Apply the Second Coat:
After the first coat has dried, apply the second coat of the waterproofing product. This two-coat process ensures maximum protection. Again, make sure to cover all areas of the window box, paying close attention to the seams, joints, and any cracks. Allow the second coat to dry and cure completely according to the manufacturer's instructions. This curing process is crucial for the durability and effectiveness of the waterproofing.
Additional Tips:
- Consider using drainage methods to prevent water buildup. You can punch holes in the bottom of the window box or use plastic liners to hold potted plants, allowing excess water to escape.
- Seal the box with a penetrating primer or sealer for added protection.
- If you are attaching the window box to your house, caulk the holes in the wall to keep them waterproof and to seal off the vinyl.
By following these steps and allowing adequate curing time, your plastic window box should be properly waterproofed and ready to withstand the elements.
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Attaching the box
First, you need to locate the studs on the house using a stud finder. Mark the location of the studs lightly with a pencil. You can also try tapping the wall with a hammer—a deep, hollow sound indicates no stud, so keep tapping until the sound changes to a higher, more solid sound.
Next, you need to determine the mounting location and mark it. For double-hung or sliding windows, measure down 1 inch from the underside of the windowsill directly below one side of the window frame. Make a pencil mark at this point to indicate the top of the bracket. For out-swinging windows, measure down 6 to 8 inches instead to allow for proper clearance. Repeat this process on the other side of the window. Make sure your marks are level and symmetrical.
Now, hold the window box up to the wall so that the centre of the box matches the centre of the window. Adjust the positioning to your taste if necessary. While holding the box to the wall, mark on the top edge of the back of the box where the corresponding stud locations are on the wall. These will be the locations for you to drill pilot holes in the back of your window box.
Drill reference holes through the box and into the siding. Then, at each reference point, drill 5/8-inch holes through the siding to allow for movement. Drill 1/4-inch pilot holes into the studs through the clearance holes. Apply silicone caulk to each pilot hole to prevent water infiltration.
Finally, attach the box using lag screws, ensuring it is level and secure. If your window box is being attached to brick siding, you should use a hammer drill and masonry bit to drill holes into the brick at your marked locations. Drill slightly deeper than the length of your wall anchors. Insert plastic wall anchors into the drilled holes, then align your mounting brackets with the anchors and secure them using lag screws. Tighten the screws with a box-end wrench.
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Frequently asked questions
Use vinyl-siding hooks that fit into the siding's grooves. Make sure they are heavy-duty and can support the weight of the window box.
You will need a ladder, a hammer drill, a masonry bit, plastic wall anchors, mounting brackets, lag screws, and a box-end wrench.
Measure approximately 4 inches from the bottom outer edge of the window inwards. Mark each endpoint with a pencil. Measure from that point downward until you reach 6 to 8 inches below. Repeat this for the other side of the window.
Use a stud finder. If you have vinyl siding, use a zip tool to loosen the course below the window. You can also try tapping the wall with a hammer—a deep, hollow sound indicates no stud. Keep tapping until the sound changes to a higher, more solid sound.
Use lag screws with washers. Ensure the screws are long enough to penetrate the wall and securely hold the weight of the window box.











































