The Brew Cabin

We are building an extension. As a result we have to move our present (external) manhole cover and inspection chamber. We want to use one of the modern plastic chambers rather than create our own brick and mortar one, but can't find any information about fixing the dpc up to or around or under it.
Can anyone help?

Hi Sarah,

I don't understand - why would a dpc have any connection with a plastic IC? You only have a dpc in the brickwork of the house walls - why do you think it would be a problem with a new IC?

The floor will have to have dpc under it, but the IC will be in the middle of the floor! We don't know where the dpc needs to go around/under/on the IC, or indeed how to fix it to stop any dampness creeping up between the edge of the dpc and the IC itself.
Does that make any sense?!

Aaah - you mean a dpM - a damp proof MEMBRANE - a dpC( damp proof COURSE) is used within walls.

If you are planning to incorporate a dainage IC within an internal floor, first, you must have the drainage plans aopproved by your local Building control Officer and second, you will need to use a double-seal IC cover to prevent any gases or odours arising from the sewers.

The dpm is laid up and around the IC, trimmed to suit. It's not critical if it just touces the sides of the chamber, or if it comes, say, 50mm up the sides. The purpose of a dpm is two-fold - to prevent the concrete being dried out by the sub-base and to protect the concrete from any 'corrosion' from beneath. A gap of 25mm or so around an IC is not the end of the world. :)

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