Ella Walter
Back-to-wall toilets are harder to install than ordinary toilets, and they are also more challenging to repair and maintain. However, they offer a streamlined, sleek, and clutter-free design. To install a back-to-wall toilet, you need to create a void behind the toilet pan to house the plumbing. This is typically done using a DUCT set, which creates a false wall to conceal the cistern, waste pipes, and flush kits. The cistern is mounted on the wall and connected to the pan with a 90-degree flush pipe and a pan connector. An access panel is required for maintenance and repairs.
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What You'll Learn
Ensure you have a deep enough wall to hold the cistern
When installing a back-to-wall toilet, it is important to ensure that you have a deep enough wall to accommodate the cistern. Back-to-wall toilet cisterns are typically shallow in depth to fit into a stud wall. However, you need to make sure that your wall can accommodate the cistern's dimensions.
To ensure you have enough depth, measure the distance between the studs in your wall. Ideally, you should choose a cistern that will fit comfortably between two studs. This will provide a secure and stable installation for your back-to-wall toilet.
If you have a solid wall, you may need to consider alternative options. One solution is to use a back-to-wall cistern furniture unit, which is a boxed-in section placed behind the toilet to house the cistern and pipework. This option will provide a neat and minimalist look, but it will not save as much space as a concealed cistern.
Additionally, when installing the cistern, it is crucial to leave enough room for manoeuvre and future repairs. Create a removable panel in front of the cistern to allow access for servicing and repairs. This can be done by cutting out a section of the wall or installing a removable panel that can be taken out when needed.
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Create a void for plumbing using a DUCT set
To install a back-to-wall toilet, you need to create a void behind the toilet pan where all the plumbing will be located. This is because, unlike a domestic close-coupled toilet, a back-to-wall toilet requires the cistern to be concealed within an integrated plumbing system (IPS).
To create this void, you can use a DUCT set. This is essentially a false wall, behind which you secure all the cisterns, waste pipes, and flush kits. Here is a step-by-step guide on how to create a void for plumbing using a DUCT set:
- Before your DUCT set is fitted, complete the first fix plumbing. Mount the cistern on the wall, and connect it to the pan with a rigid 90-degree flush pipe and a 4-inch pan connector.
- Construct and install your DUCT set, ensuring that all fixings are secure.
- Carefully handle the IPS panels and fix them to the DUCT framing. Take extra care during installation to protect your panels.
- With the IPS panels and DUCT set in place, offer up your back-to-wall toilet pan and mark around its edge with a pencil.
- Move the toilet to one side and remove the panel from the DUCT set.
- Measure 20mm inside the marked line and create a smaller internal marking to indicate where you will cut out an opening for the waste and flush pipes. This is also the time to measure, mark, and cut where your flush control will be located.
- Reconnect your IPS panel and offer up your toilet again, ensuring that the waste and flush pipes are within reach.
- Mark the floor through the holes on the side of the base of the toilet pan, ready to install your pan fixings.
- Remove your back-to-wall toilet one last time and drill holes for plugs and fixings in the marked locations.
- Put your toilet pan into its final position, connecting all internal plumbing before securing the pan in place with your floor fixings.
- Finally, run a silicone bead around the base of the toilet pan and up to where the toilet pan meets the rear IPS panel.
By following these steps, you will create a void for your plumbing using a DUCT set, allowing you to conceal the cistern and pipework behind a false wall and achieve the sleek, minimalist look of a back-to-wall toilet.
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Install the cistern and wall panel, leaving room for repairs
Installing a back-to-wall toilet can be more challenging than installing a standard toilet, and it is recommended that you hire a licensed plumber to perform the installation. That said, if you are handy and feel comfortable following instructions, you can attempt to install it yourself.
To install the cistern and wall panel, you will need to create a void behind the toilet pan to house the cistern and plumbing. This can be done by installing a DUCT set, which creates a false wall. First, you will need to do the first fix plumbing and mount the cistern on the wall. The cistern will be connected to the pan with a rigid 90-degree flush pipe and a 4-inch pan connector. Construct and install the DUCT set, ensuring that all fixings are secure. Handle the IPS panels carefully and fix them to the DUCT framing.
Next, you will need to mark the location of the toilet pan and cut out a removable panel in front of the cistern. This panel will provide access for repairs and maintenance. Make sure to measure and cut the opening for the waste and flush pipes, as well as the location of the flush control. Reconnect the IPS panel and offer up the toilet pan again, ensuring that the waste and flush pipes are within reach. Mark the floor through the holes on the side of the base of the toilet pan, ready for installing the pan fixings.
Finally, remove the toilet pan one last time and drill holes for plugs and fixings in the marked locations. Put the toilet pan into its final position, connecting all internal plumbing before securing it in place with floor fixings. Run a silicone bead around the base of the toilet pan and up to where it meets the rear IPS panel.
By installing a removable panel in front of the cistern, you will have access for repairs and maintenance while still achieving a sleek and minimalist look.
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Mark, measure, and cut openings for pipes and flush controls
Back-to-wall toilets can be harder to install than ordinary toilets, as all the moving parts and the soil pipe are behind the stud wall or in a furniture unit. To install a back-to-wall toilet, you need to create a void using a DUCT set, which is a false wall behind which the cistern, waste pipes, and flush kits are secured.
- Construct and install your DUCT set, ensuring that all fixings are secure.
- Offer up your back-to-wall toilet pan and mark around the edge with a pencil.
- Move the toilet to one side and remove the panel from the DUCT set.
- Measure 20mm inside the marked line and create a marking to cut. You will be cutting the slightly smaller internal marking to create the opening for the waste and flush pipes.
- Measure, mark, and cut the location of your flush control.
- Reconnect your IPS panel and offer up your toilet again, ensuring that the waste and flush pipes are within reach.
After marking, measuring, and cutting the openings, you can proceed with installing the back-to-wall toilet by drilling holes for plugs and fixings, connecting the internal plumbing, and securing the pan in place with floor fixings.
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Drill holes, connect plumbing, and secure the pan with floor fixings
Before beginning any installation, it is important to check that the wall is strong enough to support the weight of the toilet and cistern. If you are installing a cistern within a wall, you may need to remove tiles and create a hole for the flush plate. This is not recommended for those unfamiliar with plumbing.
To install a back-to-wall toilet, you will need to drill holes, connect the plumbing, and secure the pan with floor fixings. First, drill holes in the wall for the flush plate and cistern. The cistern will need to be concealed within the wall, so ensure that there is enough space to accommodate it. Use wall plugs to ensure that the screws are secure in the wall.
Next, connect the plumbing. This may involve relocating the plumbing to align with the new toilet. The back-to-wall toilet pan is usually suitable for both S and P trap configurations and back or wall water inlet connections. Ensure that the pipework is tucked into the wall and only the flush button or panel is visible.
Finally, secure the pan to the floor using floor fixing brackets. Slide the toilet into position over the floor brackets so that it engages fully with the soil pipe and sits snugly against the wall. Mark the fixing holes onto the wall, then screw through each fixing hole and cover with screw caps.
Once the pan is secured, you can adjust the seat to align with the pan. Loosen the fixing bolts and slide the fittings forward or backward as needed, then re-tighten the bolts.
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Frequently asked questions
Back-to-wall toilets are harder to install than ordinary toilets, and they can also be harder to repair and maintain. You need to have a void behind the toilet pan where all the plumbing is located.
You can create a void using a DUCT set, which is a false wall behind which the cistern, waste pipes, and flush kits are secured.
After creating the void, you need to offer up your back-to-wall toilet pan and mark around its edge with a pencil. Move the toilet aside and remove the panel from the DUCT set. Then, measure and cut an opening for the waste and flush pipes.
Drill holes for plugs and fixings, put the toilet pan in its final position, and connect all the internal plumbing. Secure the pan with floor fixings and run a silicone bead around its base and where it meets the rear IPS panel.
