All Categories

Bunding pipes through tanked wetroom floors

29/10/2025

When it is not possible too directly sleave a protruding pipe or waste because the hot and cold are on flexible connections or the bath waste needs movement for installation of the trap, we need isolated bunding.
Below are photos how we have incorporated bunds around pipes using plastic waste and timber. This is to prevent water migrating to the floor below if it is allowed to get between a tile and the surface tanking.

In these photos bunding has been achieved in a few ways.

Pictures 1.0 to 1.4
We have used 50mm plastic waste solvent welded to a 1.5mm ABS plate with a hole drilled through it then bonded to the ply floor with MitreBond.

Around the bath waste the carpenter has made a timber bund which was tanked around with Seal-Strip then overlade with polyethylene smoothed into a wet cement / flexbinder sealing membrane.

Bunding pipes under a freestanding bath 1.0

Bunding pipes under a freestanding bath 1.1

Bunding pipes under a freestanding bath 1.2

Bunding pipes under a freestanding bath 1.3

Bunding pipes under a freestanding bath 1.4

Pictures 1.5 to 1.9
Position change of vanity hot and cold with flexible connections.

A section of the tanked ply floor was cut out; two holes were cut in a new piece of ply slightly bigger than the 50mm plastic waste pipe.

The ply was screwed down and the waste pipes pushed tight into the aperture, Alfix pipe sleaves are used to provide a seal around the waste pipe and then tanked to overlap the existing tanking.

The hot and cold pipes can now move freely with the aperture without the floor tanking being breached.

Bunding pipes for a vanity unit 1.5

Bunding pipes for a vanity unit 1.6

Bunding pipes for a vanity unit 1.7

Bunding pipes for a vanity unit 1.8

Bunding pipes for a vanity unit 1.9

0 Comments

Dealing with marker lights in wetrooms

21/8/2025

0 Comments

There is no point waterproofing a wetroom if you are going to cut holes though it to locate lights.

Although the lights themselves maybe suitable for wet areas they generally don’t have a waterproof housing which can be bonded into a tanked floor.

This is a solution we came up with using standard plumbing and electrical components to prevent water migrating to the floor below.

We are not necessarily talking about water on tiles here but water getting between the tiles and the tanking system.

Here we used a 50mm Solvent Weld access plug with screw cap
Removed the cap and drilled holes for the flexes
Inserted IP68 Stuffing Glands
Pulled the flexes through the glands and tightened
Screwed the access socket back on to the lid
Drilled a hole through a piece of 1.5mm ABS plastic slightly smaller than 50mm waste pipe
Solvent welded a piece of 50mm waste pipe to the plate
Solvent weld a 50mm straight coupling to the waste pipe
Solvent welded the coupling to the access socket
Routered a rebate to the floor ply and using MitreBond , instantly bonded it to the ply, finishing flush with the plywood floor
The ABS plate was tanked around the aperture of the socket with the rest of the floor
A hole can be drilled in the tile to suit the marker light bridging the socket aperture.
We used sweeping bends and ABS plates to locate wall lights low level in a shower wall; water cannot get up a bend.

Detailed instructions:

0 Comments

Installing a channel drain and applying a polyethylene tanking system

21/8/2025

0 Comments

How to apply a liquid and polyethylene sheet tanking system to one of our channels. This channel is designed to fit tight to all three walls with 17mm horizontal flanges to suit a 10mm tile, tile adhesive, and tanking membrane.

The outlets were positioned off centre to avoid joist and services below.

Detailed instructions: