How to Fit Shower Panels Under a Sloping Ceiling

A shower panel is made for a rectangular space with a flat floor, flat ceiling and square corner. As often as not, your loft conversion, bath in the attic or room under a pitched roof won’t have any of these. You’ll end up having to fit a panel that’s been manufactured for a 2400mm wall in a standard bathroom and it will look too large at the top and too short at the bottom.

However, it is possible to install them with a bit of extra thought. We’ll go through how to measure a sloped wall, how to cut the panels, how to make sure the top doesn’t leak and whether to panel the slope.

Sloped Ceilings

If you have a flat ceiling you will be able to cut all your panels to the same height. However, with a sloping ceiling you will need to cut each panel to a specific height. Each panel will need to be cut along a sloping line.

Another thing to consider when installing on a sloping wall:

More water will run into the join at the top. Often the slope of your loft shower will directly be above your shower head zone or shower tray. Water will splash or steam into the sloped wall so you will need to make sure the join between your panel and ceiling is well sealed.

Measurement errors will increase. A sloped wall will often not appear to be straight. This will cause your cut to be a few mm out at one end causing a gap or awkward overlap.

Whilst this can be done by a competent DIYer it’s always best to take your time. Most of your time will be spent creating the template.

Room Considerations

Before purchasing anything make sure you know what kind of slope you have. Stand in the shower position and measure the height of the wall at the front and back of the shower area. You’ll notice the start of your ceiling slope. Often in a loft room the wall will rise up to a knee wall which is anywhere between 1000mm-1500mm. From here the ceiling will start to slope inwards at an angle of often between 30-45 degrees depending on the pitch of your roof.

There are often three setups:

The first option is almost standard. The third option is where you’ll really need to make use of your templates.

Also consider headroom. Whilst there isn’t a fixed rule there’s generally a sensible minimum headroom of 1900mm-2000mm where you’ll actually be standing in your cubicle. The slope can be used to hide the sides and back of your shower but not where the shower head is.

Panel Considerations

Not all panels can be cut easily. Thin panels such as PVC or hygienic cladding will cut nicely with a fine tooth saw. They’re also more forgiving with angled cuts. Thicker or stiff panels such as laminate faced panels may chip when cutting diagonally due to a coarse blade or lack of support. If you know you’re going to have a slope then make sure to mention it when choosing. This should affect your choice of material and quantity.

Panels are commonly 2400mm high and 1000mm wide. This means if you have a standard ceiling height you’ll have minimal cutting to do. If you have a slope then you’ll be losing a large amount of your boards to waste. To be safe you should order one extra panel than you measure. If you’ve cut your panel incorrectly on a diagonal there’s nothing you can do to save it. Make sure you know your suppliers returns policy for cut or opened panels.

To see a variety of finishes and panel sizes check out Floors To Walls Shower Panel. You can see the specifications for each panel to see how thick they are and how to best cut them.

Accurate Template

This is the main part of your project. If you try to cut your panels freehand on a slope you’ll almost certainly end up with a gap.

Use a firm template for each panel. Thick card, lining paper or spare offcuts of thin board will work. Cut your template slightly larger than needed and place against the wall exactly where the panel will sit. Mark a line along the ceiling using a pencil.

Use your gauge to get the angle. A sliding bevel is useful for getting the angle between your wall and ceiling. This can be compared to your template. A contour gauge is useful if the ceiling is slightly irregular.

Mark your start and end points. Measure the height at the left and right of each panel. Draw a line between the two points. This is more accurate than measuring in the centre.

Label your templates and panels. Give each a number so they can’t be mixed up.

Once you’ve created your template double check it against the wall. If your template fits at the top but not at the bottom it indicates your floor/tray isn’t level. It’s better to realise this now.

Panel Cutting

Most PVC and composite panels can be cut with a fine tooth handsaw or fine tooth jigsaw blade. To ensure a neat cut on your decorative side you can cut from the front using a fine blade. Or from the back using a jigsaw blade with an upcut. To ensure a straight cut use a straight edge clamped to your panel. Support the panel on both sides of your cut so it doesn’t bend and crack.

Cut slightly outside your line and then plane/sand back. It’s easy to remove an extra mm but not add it back. Lightly sand the edge of your panel to remove any burrs that may catch your sealant.

Leave an expansion gap as advised by the manufacturer. Panels will expand slightly depending on the temperature. The size of the gap will depend on your panel so make sure to follow the manufacturers instructions.

Top Edge

• The top edge will be the most noticeable part of your installation. There are a few common options:
• Use a trim or cover. Use a sloped or flexible trim along the slope of your panel. This is the most forgiving option as any imperfections with your cut will be hidden.
• Sealant only. If you’re confident with your cut and have a small gap you can use a neat bead of neutral cure sanitary silicone. This should be applied to clean dry surfaces.
• Panel the ceiling. This will give the most watertight finish but requires extra cutting. The panel will be cut around the slope.
• If your sloped section is directly above your shower head, make sure to treat it like part of your wet area. Seal it properly, paint any neighbouring plasterboard with a bathroom or moisture resistant paint and ensure you have some mechanical ventilation. As the ceiling will be sloped in a loft room warm damp air will often get trapped at the top. If you’re unsure if your ceiling construction behind is suitable for a wet area then ask a tradesperson.

Panel Fitting

Double check your cuts and dry fit all of your panels. Follow the manufacturers instructions for application and open time. Panels will be under slightly different loads as they are sloped so any poor bonding will show at the top edge.

Start fitting from the tallest or flattest part of your panel. This way any small errors will be hidden. Press your panels firmly into place. Wipe away any excess adhesive immediately. Allow to cure for the recommended time. Only apply sealant once your panels are secured. Make sure you don’t use your shower until the sealant has fully cured as shown on the tube.

Don’t Panel The Slope

Sometimes the best option is to stop your panels at a clean horizontal line. If you have a steep angle, short surface or the wall isn’t in the splash zone then a moisture resistant painted finish or separate ceiling will look neater. A horizontal cut with a trim is much easier to keep watertight.

This will depend on your overall design. If you’re still figuring out your attic/loft bathroom layout then check out our Bathroom Renovation Ideas guide that will help you to decide where to place your shower.

Purchasing

When ordering make sure to mention the tallest and shortest height of your wall. Make sure to mention your slope. Companies like Floors To Walls can advise you on the best size of panel and trims for your layout. Ask if they can provide samples so you can try cutting on a real offcut.

Summary

Make sure your templates are the main focus of your project. Once you’ve measured the start and end of each panel, noted the angle using your bevel gauge, cut your card templates for each board and dry fit everything together. Finish your top edge with a trim or neatly tool your sanitary silicone. Order an extra panel. Check your headroom. If a section of your slope looks like more hassle than it’s worth then stop your panels at a straight line. Finish with a moisture resistant paint. Take your time on your first afternoon and use a roll of lining paper to help avoid ruining your panel later.