Waterproofing Inspection Pits and a Channel
Concrete inspection pits with pipe connections and a narrow channel were given coats of waterproofing, first grey and then white, so water can't leak out through their walls.
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Step by step
1. The bare pit
The inspection pit was bare concrete, with pipes coming in through the sides. Concrete on its own soaks up water.
2. First coat
The first coat of waterproofing goes over the floor and sides and around every pipe.
3. The channel
The same is done in the narrow channel, right up to its edges.
4. White coat
A white coat follows over the grey one, covering the rim of the pit as well.
5. The long pit
The long pit gets its white coat too, worked carefully around the upright pipe.
6. Channel and pit
The channel and the pit at its end are now one continuous surface, with no open joints.
7. The result
A smooth, glossy surface that doesn't let water leak through and is easy to clean.