How to install a PVC window

This article is about how to install a PVC window, as to improve the appearance of your house and to increase its insulation. PVC windows are very efficient, due to the smart design, and durable. If you install them properly you will enjoy using them for a long period of time. Installing a PVC window is not the hardest job in the world, but it requires attention and hard-work from the diy-er, as well as moderate knowledge about this task. By reading our step by step article, you will get the necessary information about the installation project, so pay attention to our guidelines, if you want to do a proper job.

Remember that the most important step is the preparation, so be highly attentive when taking the measurements and when preparing the surface for installing the PVC window. Generally speaking, a diy-er can be never too cautious, so make sure you measure at least twice the window opening before placing the order to your local store. We recommend you to start with a smaller project (bathroom window for example) as to get accustomed with the techniques, and afterwards you can install bigger and more complex PVC frames. By installing the vinyl windows by yourself, you will both improve your skills and save a great amount of money.

This article is mainly about installing a PVC window in a new construction, but you can use these techniques for replacing an old window. In the latter case, you have to remove first the openers (the components of the window which open), then the glass and last the window frame. Removing the frame might be a little difficult, but you have to proceed in such a manner as to minimize damage to walls.

Made from this plan

In order to install a PVC window, you need the following:

Materials

• PVC window
• Window sealant
• Long screws (6-8” / 15-20 cm)
• Polyurethane foam

Tools

• Safety gloves, glasses
• Measuring tape, carpentry pencil, l-square
• Stud finder (if your house has wooden walls)
• Drill machinery and drill bits
• Chisel, Spirit level
• Vacuum cleaner

Tips

• Use a vacuum to remove the residues after drilling the holes in the wall
• Don’t tight the screws too much, as you risk damaging the window or bend the frame

Time

• 2 Hours

My best tips on installing a PVC window:

PVC windows are durable, energy-efficient, and low-maintenance, making them an excellent choice for both new construction and replacements. While installing one may seem like a complex task, with the right tools and technique, you can complete it with confidence. Here are my best tips for installing a PVC window.

1. Gather the Right Tools and Materials

Before you begin, ensure you have the following tools and materials:

• PVC window and frame kit
• Screws and wall plugs
• Drill and drill bits
• Shims
• Caulk and caulking gun
• Spirit level
• Measuring tape
• Screwdriver
• Pry bar (if replacing an old window)
• Utility knife

2. Measure the Window Opening

Accurate measurements are critical for a proper fit. Measure the width and height of the window opening at multiple points (top, middle, and bottom for width; left, center, and right for height):

• Use the smallest measurements for both dimensions.
• Ensure there is a gap of about 1/4 inch around the window for expansion and sealing.

If you’re replacing an old window, remove the old frame using a pry bar and clear out any debris or old sealant before installing the new window.

3. Prepare the Window Opening

Before installing the new PVC window, check that the opening is level, plumb, and square:

• Use a spirit level to check that the window opening is even.
• If necessary, use shims to adjust the frame and ensure a level fit.
• Clean the opening thoroughly, removing any dust or debris that could interfere with the window installation.

4. Dry Fit the PVC Window

Do a dry fit to make sure the PVC window fits correctly in the opening:

• Place the window in the opening and ensure it sits level and plumb, with equal gaps on all sides.
• Check for smooth operation by opening and closing the window while it’s temporarily in place.
• Make any necessary adjustments with shims to ensure the window frame sits correctly.

5. Drill Pilot Holes

Once you’re satisfied with the fit, remove the window and drill pilot holes for the fixing screws:

• Mark the fixing points on the window frame (usually about 6 inches from each corner and every 12-16 inches along the sides).
• Use a drill with a masonry bit to drill into the surrounding wall where the screws will go. This will ensure a secure attachment for the frame.

6. Apply Sealant to the Frame

Before installing the window permanently, apply a bead of caulk or silicone sealant around the inside edge of the window frame. This will help create a waterproof seal between the window and the wall, preventing drafts and moisture from seeping in.

7. Install the PVC Window

Carefully place the PVC window back into the opening, making sure it is aligned with the pilot holes you drilled earlier:

• Secure the window frame to the wall by inserting screws through the frame into the wall plugs in the pilot holes.
• Tighten the screws gradually, alternating between different sides to avoid shifting the frame out of place.
• Check with a spirit level as you go to ensure the window stays level and plumb.

8. Insert Shims for Support

Place shims around the window frame to ensure it stays level and aligned. Insert shims at the corners and along the sides where necessary:

• Avoid over-tightening the screws, as this can warp the frame. The shims help maintain the proper shape of the window.
• Once the window is securely in place, cut off any excess material from the shims with a utility knife.

9. Seal the Perimeter

After the window is installed, apply a continuous bead of sealant or caulk around the outside edge of the frame:

• Smooth the caulk with your finger or a caulking tool to ensure a clean finish and complete seal.
• This step is essential for keeping water, air, and insects from entering around the window frame.

10. Install the Interior Trim

For a finished look, install interior trim around the inside of the window. This covers the gap between the window frame and the wall:

• Attach the trim pieces with finishing nails or adhesive.
• Caulk any visible seams or gaps to create a polished appearance and further seal the window.

11. Test the Window

Once the window is installed and sealed, test it to ensure everything works as it should:

• Open and close the window to make sure it operates smoothly.
• Check that all locking mechanisms work properly.
• Inspect the seals to ensure no gaps or drafts are present.

Bonus Tip: Insulate the Gaps For added insulation, consider filling the gap between the window frame and the wall with low-expansion foam before applying the interior trim. This will help improve energy efficiency and prevent drafts.

Installing the PVC window frame

Measuring window opening

The first step when installing a PVC window is to take accurate measurement. Therefore, use a tape measurement and take the dimensions in width (both at the bottom and the top) and height (both left and right). Remember than when ordering the window, always use the smaller dimension (the walls might be curved and the top might not match the bottom).

Using shims around the frame

After you receive the pvc window frame, openers and the glass, you have to install them. Consequently, move them inside the door opening, by making sure you don’t scratch them. Use safety gloves and work attentively and with patience, as to get the job done properly.

In most of the cases, you will find useful to use shims under the PVC window, as well as around it, as to make sure you will set an even space from top to bottom. In the image you can see a large gap, as it is a new construction, but if you replace an old window the space should be much smaller, around 1/4”.

Drilling holes in the PVC window frame

Next, you have to use a spirit level as to make sure the PVC window is plumb. In addition you have to make sure the window is placed symmetrically in the opening, otherwise it won’t be aligned with walls. After you have aligned the PVC window inside the opening, you have to secure it to the walls with at least 2 screws on each side. Therefore, use a drill machinery and a long drill bit, as to make several holes in the wall. If you install the window around wood studs, you have to proceed in the same manner, but to use drill bits for wood.

Using a level to make sure the window is plumb

Continue drilling holes in the window frame and use the spirit level, in order to make sure the window is plumb and aligned with the wall. When fastening the PVC window frame, make sure you don’t over tighten the screws, otherwise you risk damaging it or bend it from the right position.

Work with patience as a beginner could compromise very easily the whole project. The essential aspect is to align the frame properly and insert the screws in a right manner.

Fastening the PVC window with screws

Next, you have to insert screws on the other sides of PVC window frame, in the same manner as we have described above. Remember that these screws will secure the PVC window frame and lock it to the walls.

Attaching the window to the PVC frame

Next, after you have inserted the screws in the PVC window frame, you have to install the openers (the parts that open) to it.This process is straightforward, you should connect it to the hinges and in some cases drive in several screws (you should find more details by reading the manufacturer’s instructions).

If you have reached this stage of the project, it means that you are almost done the hard work and very soon you will enjoy the comfort of a PVC  window.

Sealing the PVC window

Next, you have to use a good sealant to fill the gap between the window frame and the brick opening. Consequently, you should use a sealant for windows or polyurethane foam, as you see in the image.

Glass for PVC window

Usually, when installing a PVC window, the glass comes separately from the frame, so that it doesn’t brake or scratch during the transportation or during the installation process.

Inserting screws in the PVC window frame

In addition, we recommend you to countersink the heads of the screws that you have inserted in the frame, otherwise the glasses might not fit into place. You should also measure the diagonals of the windows, and use a spirit level as to make sure the frame is plumb and well aligned with the walls.

Afterwards, you should install the glasses inside the PVC frame and secure them by installing the plastic rod.

Installing glass to PVC window

In order to install the interior rod which secures the glass, you should press it with your fingers, to the PVC frame. This procedure is quite simple, you just have to make sure they attach to the channels properly, otherwise they won’t lock the glass into position.

Next, after the foam dries out, you have to use a cutter to remove the excess. If you have used sealant, then you have to make sure it doesn’t go over the PVC frame, as it can obstruct the drain channels inside the window. Last but not least, you should caulk the space between the window and the sill (both inside and outside your home), by using silicone.

By following these steps, you’ll be able to install a PVC window that’s secure, level, and well-sealed. Whether you’re replacing old windows or installing new ones, these tips will ensure a professional finish that improves both the look and performance of your home.

Thank you for reading our article on how to install a PVC window, and we recommend you to check out the rest of our projects. Please SHARE our articles by using the social media widgets and subscribe.

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