Pipework & soil stacksin Cardiff & South Wales

First fix pipework in copper or plastic, internal soil stacks replaced or rerouted, all to current building regulations.

Behind the wall is where bathrooms succeed or fail. Pipework run at the wrong gradient, joints buried that should be accessible, copper run too tight to a hot pipe - these are the problems that come back to bite a household three winters later. We run first fix to a standard the second fix can sit on top of without surprises.

Internal soil stacks are the most common rework on older Cardiff terraces. Cast-iron stacks have a working life and tend to need replacing in the renovation rather than after it. We replace in plastic with proper bracing, take the old cast iron out tidily, and reroute the boss connections so the new bathroom layout works.

New installs, full rip-outs of failed pipework, gradient corrections on slow-running wastes, soil stack replacement and reroutes, vent terminations through the roof.

How a pipework & soil stacks job runs.

Every job is run the same way: same team, same trades, same approach. The notes below are how we think about pipework & soil stacks specifically.

i.

First fix in copper or plastic

Copper for visible runs and where insurance specifies it, plastic for hidden under-floor runs. Always pressure-tested.

ii.

Soil stack replacement

Cast iron taken out cleanly, plastic in with the right brackets and falls. Boss connections planned around new layout.

iii.

Waste gradients

15mm fall per metre on a 40mm waste, no exceptions. Slow-running wastes after a renovation are almost always a gradient problem.

iv.

Vent terminations

Through the roof, properly flashed, no air ingress at the joints. Some routes use AAVs internally where appropriate.

A few pipework & soil stacks jobs.

Pulled from the last few months across Cardiff, Newport and the boroughs. Hover for a one-line note on the project.

Ready to plan a pipework & soil stacks?

Call Simon for an initial chat, or send a couple of photos of the space and Sycamore will come back with a quote the same week.

Frequently asked.

Do I need to replace cast iron soil stacks?
If you are renovating, almost always. The labour to take it out later is much greater once tile and plaster are over the boxing.
Can pipework be hidden behind tile?
Yes, with accessible junctions where the regulations require them. We document any buried joint locations.
Plastic vs copper in walls?
Plastic is fine and often better in walls (no condensation drip in cold weather). Visible above-floor runs we tend to do in copper.
Are AAV vents allowed?
In specific configurations yes, but a roof-terminated vent is preferred and what we recommend for ventilation reliability.

Let's talk about the space.

A few photos and a sketch of the room is usually enough for a first quote. For anything structural or tricky, we come and look.

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