Fitting Plastic Window Trim: A Simple Guide

how to fit plastic window trim

Plastic window trim is an important feature that fills the gap between a UPVC window and the wall, providing a decorative finish to the room. It is relatively easy to fit plastic window trim yourself. The recommended adhesive for fitting plastic trim to window and door surrounds is silicone, which is flexible, weathertight, and available in different colours. Superglue is another option for fitting plastic trim, although it has the disadvantage of being less flexible for overhead fittings. Before fitting the trim, it is important to address any gaps between the wall and the window, which can be done by gluing shims to the back of the trim and then gluing the trim in place.

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Plastic window trim is used to fill the gap between a UPVC window and wall

Plastic window trim is used to fill the gap between a UPVC window and a wall, covering any sharp edges and corners. It is also used to provide a decorative finish, with a variety of styles and colours available to match or contrast the window frame. Plastic window trim can be purchased from most large DIY stores and is relatively easy to fit yourself.

If you are installing new windows, your window fitter will probably fit the trim as part of the overall cost. However, if you are fitting the trim yourself, the recommended adhesive for attaching plastic trim to window surrounds is silicone. This sealant is flexible, weathertight, and can come in different colours. Alternatively, window trim can be fitted with tape or adhesive such as superglue.

Before fitting the trim, it is important to measure the gap between the window and the wall and re-measure over a small period of time. If the gap stays the same, you can proceed with filling it. If the gap increases in size, you may have a problem with the structure that needs addressing.

There are several methods you can use to fill the gap between the window and the wall. One option is to use expanding foam, which can be purchased from home improvement stores for around £5-10. Squirt the foam into the gap and let it set for a day before trimming it back with a knife. Another option is to use caulk or filler to seal the gap, which can then be painted over. Once the gap has been filled, you can attach the plastic window trim using your chosen adhesive.

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Use an adhesive like silicone or superglue to fit plastic window trim

Plastic window trim is used to fill the gap between a UPVC window and a wall. It is generally available at large DIY stores and can be fitted yourself using adhesives like silicone or superglue. Silicone sealant is flexible, weathertight, and comes in different colours. It is also possible to use double-sided tape to attach the trim, but this may leave residue when removed.

Before applying the adhesive, ensure that the trim fits well and use a hairdryer to heat up the adhesive if necessary. When using silicone, keep it away from the edge where the trim meets the window to avoid any mess. Apply small amounts of silicone with a silicon tool, finger, or sponge, all dipped in soapy water. Wipe away any excess with a wet cloth.

If you are attaching the trim to wood, you can use glue or adhesive strips. For a perfect fit, attach the top first, then the corner blocks, and then work out the angles necessary to trim each end of the side pieces. This is because the walls may not be 100% vertical. You can also use square blocks at the top corners to avoid the need for perfect mitres.

In some cases, a two-part adhesive may be used, with one part coming out of a dropper bottle and the other part sprayed on from an aerosol. For exterior applications, avoid water-based adhesives, as they are not suitable for outdoor use.

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Heat adhesive with a hairdryer to remove without leaving residue

Plastic window trim is used to fill the gap between a UPVC window and a wall, providing a decorative finish. It can be purchased from most large, well-known DIY stores and is relatively easy to fit yourself. The recommended adhesive for fitting plastic trim to window surrounds is silicone. However, window trim can also be fitted with tape or adhesive such as superglue.

If you are using tape or adhesive, you may want to consider heating it up with a hairdryer to remove it without leaving residue. Heat the adhesive until it is hot to the touch, generally around 70-200 °F (21-93 °C). Be careful not to leave the hairdryer in one spot for an extended period, especially if you are heating an OLED screen or adhesive underneath a battery. Keep the hairdryer unplugged and switched off when not in use, and avoid using extension cords to power it. Once the adhesive is hot, carefully pull it up and it generally won't leave much residue. If there is residue, it can be removed with cleaners like "Goo Gone", WD40, or cooking oil.

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Use corner blocks to work out angles for a perfect trim fit

Fitting plastic window trim is a great way to improve the look of your windows and add a decorative finish. When fitting trim, it is important to get the angles right, especially in older houses with wonky walls. To achieve a perfect trim fit, you can use corner blocks to work out the angles.

First, attach the top of the trim, then the corner blocks. This will allow you to work out the angles necessary to trim each end of the side pieces for a perfect fit. It is likely that your walls are not 100% vertical, so getting perfect mitres can be tricky. By using corner blocks, you can avoid the need for angle cuts with a miter saw.

To determine the angle of your wall, you can use an online calculator or a bevel protractor. Place the base end of the bevel protractor firmly against one wall, open it up, and place the blade end against the other wall. Find the 0-degree mark and note the number above it to get the angle measurement.

You can then use this measurement to adjust your miter saw to cut the trim. The standard angle for a corner is 45 degrees. Test the mitered pieces by connecting them, and adjust the cuts as needed to achieve a seamless fit.

An alternative method is to use cardboard templates, as suggested by a DIY enthusiast. Cut a piece of cardboard until it fits the section of the wall you are working on. You can then use this template to line up your saw and check if the pieces of trim fit together correctly.

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Plastic window trim is available in a variety of styles and colours

Plastic window trim is a great way to finish off your windows and doors, adding a decorative touch and a smooth, stylish edge. It is also functional, as it neatly covers sharp edges and corners, providing an important safety feature. The versatility of plastic window trim means it can be used to complement a range of home styles, from contemporary to traditional.

Plastic window trim is available in a diverse range of styles and colours, allowing you to customise your windows to your heart's content. Whether you prefer a sleek and modern look or a classic aesthetic, there is a trim style to match your taste. The most popular styles include the Architrave & Window Trim, which comes in various widths to accommodate different gap sizes and features a pencil round finish on one edge. Another popular option is the D-mould Trim, a versatile 25mm wide uPVC trim with curves on both edges. For narrower gaps, the Quadrant Trim is an elegant choice, with its subtle curved front and 90-degree back, perfect for finishing into a corner.

If you're feeling adventurous, you can explore some of the more unusual and less-known styles on the market. These unique trims can add a touch of personality and individuality to your windows. And if you're looking for a specific colour, trims are available in a variety of colours to match your window frames or create a bold contrast. You can even opt for custom colours to ensure your trim perfectly suits your project.

When it comes to width, plastic window trim typically ranges from 20mm to 30mm, with narrower trims favoured for contemporary homes and wider trims for traditional settings. However, you can also find trims in widths as narrow as 13mm or as wide as 100mm, ensuring that you can find the perfect fit for your window size and style.

Plastic window trim is a fantastic way to enhance the appearance of your windows, offering both functionality and decorative appeal. With its variety of styles and colours, you can customise your windows to blend seamlessly or stand out strikingly.

Frequently asked questions

Plastic window trim is generally used to fill the gap between a UPVC window and a wall. It also provides a decorative finish and is available in a variety of styles and colours.

The recommended adhesive for fitting plastic trim is silicone. This sealant is flexible, weathertight, and can come in different colours. Other options include tape or adhesive such as superglue.

Use a heat gun to heat up the trim and then carefully pry it off with a putty knife. Be cautious with the amount of pressure applied to avoid cracking the window glass.

To prevent damage to the trim, avoid attaching double-sided tape directly to the trim. Instead, apply it to the edge of the window trim or use an alternative adhesive such as WD40 or cooking oil.

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