Boxing in pipes: a neat finish that still lets you reach them

Which pipes are usually boxed in

The most common is the soil stack, the large vertical waste pipe that carries the toilet down through the house. It often runs up a bathroom corner or through a cloakroom and is hard to make look tidy any other way. Heating flow and return pipes running along a skirting or dropping from the ceiling to a radiator are the next most common, followed by supply pipes to a basin or toilet.

Each type behaves differently. A soil stack is quiet and does not move much, but water rushing down it can be heard through thin board. Heating pipes expand and contract every time the boiler fires, so they need a little clearance. Supply pipes have isolation valves that need to stay reachable.

How the boxing is built

A typical pipe boxing follows a simple sequence, but the planning at the start decides how good it looks at the end.

• Check every joint and valve for leaks before anything is covered
• Fix slim timber battens to the wall and floor around the pipe
• Leave a small gap so pipes can move without touching the frame
• Add packing or acoustic insulation around a soil stack to deaden noise
• Clad the frame with board cut to suit the tiling or paint finish
• Fit removable panels over valves, stopcocks and rodding points

Access panels: the part people forget

Any valve, compression joint, stopcock or rodding eye behind the boxing needs a way in. A screwed panel, a magnetic panel or a tiled hatch that lifts out all work. The key is that it can be removed without breaking anything. If a leak or blockage happens years later, a hidden valve can turn a quick fix into taking apart a finished bathroom wall.

On a soil stack, the rodding point or access cap is the one to watch. In a tiled room, the panel can be tiled to match and sealed with a thin silicone joint so it disappears into the wall but still comes off when needed.

Moisture resistant board in bathrooms

Standard plasterboard softens and grows mould in a wet room. In a bathroom or cloakroom, the boxing should be built with moisture resistant board, or with cement based backer board where it will be tiled near a bath or shower. Timber battens should be treated, and the joints around the base sealed so cleaning water cannot creep underneath.

If the boxing forms part of a shower wall, it needs the same waterproofing as the rest of the shower area. That is easier to get right as part of a planned bathroom refit than as a separate job afterwards.

Making it look like part of the room

A boxing that stops just short of the ceiling, or that has a raw edge where it meets the skirting, looks like an afterthought. Running it the full height, returning the skirting around it and lining the edges up with tile joints all help it look built in. A wider box can even become a shelf, which is a common trick behind a toilet in a small cloakroom.

Painted boxing in a living room or hallway is finished with filler, caulk and a sanded edge so it reads as a straight wall rather than a box.

When the job needs a plumber first

Boxing in is carpentry. If pipes are leaking, weeping at a joint or need moving to a better position, that work should be done first, and anything beyond simple connections is better placed with a plumber. The handyman or specialist guide on this site explains where that line usually sits, and the cloakroom refit guide covers boxing behind a toilet.

Frequently asked questions

Bathroom RenovationsCarpentry