Should I use a DPM here?

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Hi all,

I have a cart lodge which is built on a concrete pad (which has a DPM underneath). On top of that is 6 courses of bricks, then a DPC, and then timber upwards from there.

Behind the cartloddge there is a roughly 0.9M wide path which separates it from the shed base (to the right of the photo). The shed is raised with a sleeper wall because the whole plot is on a hill.

Without this gal, there would be an issue with the height of the shed base and the timber constructed part of the cartlodge.

1000005281.jpg


In winter particularly, that gap between the two is just muddy and wet. I plan to lay a concrete path along there, with an ACO type channel drain along the back of the cart lodge to take the rainwater out.

The wall at the end of the pic is the side of the house. Yes, I realise a couple of foundation blocks are exposed. This doesn't seem to have caused any issues.

If I bed the ACO, channel, with an appropriate fall towards the camera, onto concrete up against the brickwork (to the left of the picture), at the height of the top of the third course up, so leaving two clear courses before the timber, and then fill with concrete, I would be worthwhile laying a DPM first, right, to prevent introducing a way for water to wick into that wall? The woodwork is protecting with it's own DPC but still I'd rather than wall didn't go mouldy inside.

Pic of the inside of the cart lodge below:

Any tips on laying that DPM please? I'm unsure how it should overlap the existing one that is under the cart lodge concrete pad (that you can see poking up).

1000005280.jpg



Really grateful for anyone's help ;)
 
I'm not sure where the DPC is regards the structure? Regardless, if the new path is below DPC and external, there will little use for a DPM. Stopping that timber retaining wall rotting on the other hand will be important.
 
Cheers,

To the left of the photo, that is the cartlodge. There is a DPM under its base, which you can see poking up from the edge of the base.

There is also a DPC along the top of the bricks, which the timber is resting on.

Understood that it'd be a good idea to DPM the retaining wall to the right also. There is a earth drain pipe that runs along the back of that so hopefully a DPM along the front won't cause water to get trapped in.
 

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