DIY How To

How to install UPVC windows

Fitting your own windows will require both time and patience. The key part of the process is preparation, so be sure to get your initial measurements right, measure as many times as you like to ensure the measurements are perfect. Get familiar with all the different names of the window parts, where they go and what they do.

The step by step guide below contains everything you need to know to fit your UPVC windows perfectly.

Step by step guide for fitting UPVC windows

What you need to have handy
• Chisel
• Spirit level
• Drill
• Screwdriver
• Saw
• Frame fixings
• Door & frame sealant
• Drill bit
• Tape measure (metric)
• Heavy duty gloves
• Light hammer
• Pencil

Step 1: Preparation
1. Because UPVC windows are not designed to be load bearing, make sure that there is a lintel above any window before it is removed.

2. Check that the size and style of your window correlates with what you ordered.

3. Remove any ornaments and furnishings from the area surrounding the window.

Step 2: Remove the existing window
1. Cover the surrounding areas with durable dustsheets or a cover.

2. Use a screwdriver to remove openers (these are the window parts that open) or a nail bar to remove any opening sashes.

3. Crack and remove any glass from the inside, starting from the top left corner. Be sure to wear goggles and heavy duty gloves. Ensure all the glass has been removed then move on to the next step.


4. From the inside of the window use a Stanley knife to cut through the plaster seal around the window.

5. Use a crosscut saw to cut through remaining horizontal and vertical frame members.

6. Try to keep damage to a minimum when cutting through the outer frame head and the window cill.

7. By carefully applying the nail bar, it should be possible to lever the framework away from the plaster line with minimum disturbance.

Fitting your New Window
1. Place the window cill onto the brickwork, the up stand should be feel quite tight against the plaster line of the jambs. To fit around the brickwork you may need to cut the horns a bit.

2. Using plastic packers, level the cill with 5mm clearance between itself and the brickwork.

3. Make sure that the cill is secure to the brickwork by utilising the 8x100mm fixing bolts, these should be positioned approximately 150mm from both ends and at 600mm thereafter. Be sure not to tighten the fixing bolts too much and check the level.

4. Place a bead of silicone across the back edge of the cill up stand.

5. Use superglue to securely place the end caps into the correct position. If the cill horns have been cut to fit around the brickwork then the caps might need trimming.

6. Remove glazing beads from the frame of the window and mark them so that they can easily be replaced back to the original position.

7. Move the new window into position, the base should be snug against the cill up stand, ensuring a tight seal into the silicone bead. Wipe away any extra silicon. Use your spirit level to ensure that the window is positioned vertically and tight up against the plaster line.

8. Using plastic packers that should be provided with your window, wedge the window into its correct position.

9. Ensure that the framework is not bent from over packing.

10. Make sure the vents of the window are open; this is needed to enable access to the outer frame jambs. Secure the bottom of the window to the cill, this should be 150mm from each internal corner and 600mm centre's thereafter, you should do this using 8 x 40 screws.

11. Make sure the window jambs are correctly bolted into the surrounding brickwork using 8 x 100mm bolts approx 150mm from each corner and at +/- 600mm after that.

12. It is worth remembering that when the screw heads are not standing correctly there might be problems when it comes to the glass positioning.

13. Shut and lock any opening sashes and then check within the outer frame for squareness.

Glazing
1. Prior to the locating of the glass sealed units it is important that you position 25x100 x 15 glazing brides into the frame recess. Use a small amount of silicone to keep the packer secure for the next step.

2. Position a 28 x 100 x 5 glazing packer onto the bottom glazing bridges.

3. Place the appropriate glass sealed unit into the aperture, this should rest squarely on the glazing packers, this ensures the glass is central within the opening. Push the glass as far back as possible into the rebate without using any undue pressure.

4. Using only your hand pressure, place extra 2mm glass packers where necessary to square up.

5. Carefully unlock and open the sashes to ensure that no binding occurs within the locking system and that there is no movement in-between the glass and frame.

6. Clip back the pre-marked glazing beads into the original positions and in the order of; top, bottom and sides.

7. Gently place a bead of silicone in-between the outside masonry and window periphery, be sure to wipe off any excess.

8. Similar to the last step, place a thin bead of acrylic between the inside of the plaster and the window. Allow this 1 hour to skin over.

9. Remove any protective tape from the window frame; clean the necessary areas with warm soapy water.

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