How to install a glass splashback

Video by Screwfix. This guide draws on the "How To Install Clear Glass Splashbacks" tutorial from the Screwfix YouTube channel, which covers the full process from measuring through to finishing around sockets. Screwfix is one of the most practical trade and DIY resources in the UK, and their installation guides are consistently accurate and clearly shot.

1. Measure the area carefully before ordering

Glass splashbacks are cut to size and cannot be trimmed on site, so measurement accuracy before ordering is everything. Measure the width at three points - top, middle, and bottom - and use the smallest measurement. Do the same for height. If the worktop or wall tiles are not perfectly level, you need to know that before the glass is made.

Mark the position of any sockets or switches on a scaled drawing when you order. Glass suppliers cut these apertures during manufacture. Getting the socket positions wrong means the panel will not fit. Double-check the measurements against the actual positions before you submit your order.

2. Check the wall surface is suitable

Glass splashbacks bond to the wall with specialist neutral-cure silicone adhesive. The surface needs to be flat, sound, and free of grease, dust, and old adhesive residue. Plasterboard, plaster, painted surfaces, and tiles can all work, but each needs different preparation.

On painted surfaces, lightly sand the area to give the adhesive something to grip. On tiles, check that the existing tiles are well bonded - glass over loose tiles will eventually fail. Remove any old sealant along the worktop edge and clean the area with a degreaser before you start.

3. Mark the fixing position before applying adhesive

Once the glass arrives, offer it up to the wall dry before applying any adhesive. Mark the exact position lightly in pencil on the surrounding wall surface so you know exactly where it needs to land. Check that the socket apertures line up correctly with the actual sockets before you commit.

This dry run also tells you whether the wall is flat enough to accept the panel without rocking. Glass is rigid and will not flex to accommodate a bowed wall. If there are high spots, the panel will sit on them and leave gaps at the sides - fill or sand down anything more than 2 mm out.

4. Apply the neutral-cure silicone adhesive

Apply neutral-cure silicone adhesive in blobs or short runs across the back of the glass panel. Do not use standard sanitary silicone, bathroom sealant, or any acetate-cure silicone (you will know it by the vinegar smell) - the acetic acid in acetate-cure silicone attacks mirror backing on coloured glass and corrodes the edges over time. Neutral-cure only.

Space the adhesive blobs roughly every 300 mm, and keep them at least 25 mm away from the edges of the glass. The adhesive needs to compress slightly when the panel is pressed home, so do not apply it too close to where the panel edge will sit.

5. Fit temporary support battens

Unless you have someone to hold the glass in position while the adhesive cures, fit a temporary horizontal batten to the wall along the line where the bottom edge of the panel will sit. This gives you something to rest the glass on while you press it home and make adjustments, without having to support the full weight with your hands.

Use a spirit level to set the batten perfectly horizontal. Once the glass is in final position and you are happy with it, you can leave the batten in place for 24 hours until the adhesive has set enough to hold the panel on its own.

6. Press the panel home and check alignment

Lift the panel onto the support batten and press it firmly against the wall, working from the centre outward. The adhesive blobs will compress and spread slightly. Check that the panel is level, the edges are flush with your pencil marks, and the socket apertures line up correctly before the adhesive starts to grab.

Apply gentle, even pressure across the whole panel for a minute or two. If the panel shifts during this time, use a few strips of masking tape across the top edge to the wall above to hold it in position while the adhesive cures. Do not disturb it for at least 24 hours - 48 hours is safer in cooler temperatures.

7. Seal the edges with silicone

Once the adhesive has cured, apply a thin bead of matching or clear neutral-cure silicone along the bottom edge where the glass meets the worktop, and along any side edges where the glass meets the wall or tiles. Smooth with a wetted finger and remove any excess immediately.

This edge seal prevents water and grease from getting behind the panel. It is what keeps the installation looking clean in two years rather than harbouring black mould along the bottom edge, which is the most common failure mode of badly finished splashbacks.

8. Refit the socket faceplates

The socket faceplates will need to be removed before installation and refitted afterward, using longer machine screws to span the thickness of the glass. Most glass splashback suppliers can advise on the correct screw length for the glass thickness you have ordered. Refit the faceplates carefully and check that each socket is sitting flush and secure before restoring power.

If you are not confident working around the socket wiring even with the power off, have an electrician refit the faceplates. It is a five-minute job for someone who does it regularly.

When to call a handyman

Call Richard if you want the job done cleanly from start to finish - measure, order, prepare the wall, fit the panel, seal the edges, and refit the sockets. Glass splashbacks look deceptively simple but go wrong quickly if the adhesive or edge sealing is done badly. Having a professional do it once, properly, is cheaper than replacing the panel.