I've been building a new home on a sloping corner block on the side of a hill on the Central Coast, NSW. The house is built on bearers and joists and has a big subfloor area enclosed by brickwork. Eventually I'd like to concrete as much as I can and turn a part of it into a living space while the other parts into storage space.
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Water flowing down from the hill is hitting the long edge of the home and seeping into the subfloor resulting in alot of water pooling under there and I reckon I got to deal with it sooner rather than later. Right now, the roof is on for a month and I've still got a fair bit of water pooling at the base of the bearers.
This is what it looks like with some contours:
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Here's the Western side of the home:
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This is what the southern side looks like:
I've got some ideas on how to deal with it, but I honestly don't know what I'm doing so any help would be appreciated.
From what I've been able to research, I'll need to dig a trench along the edges of the home the water is impacting against and expose some of the concrete footings, paint it with liquid rubber and/or some sort of plastic sheeting and run ag drain (I think it's called French Drain in some places?) along it, empty it into a stormwater pit with a submerged bilge pump, then pump it back up the hill into the stormwater line on the street.
I imagine something like this:
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If this is the only way I can deal with it, I've got some questions regarding this solution:
- How deep do I need to dig down in front of the footings to install the ag drain?
- How do I waterproof the footings before laying the pipe? Paint on membrane, or a combination of that and sheeting?
- How do I get around the downpipes to install the AG drain? Some of those spots seem quite awkward.
- How do I size the sump and pump combination?
- How likely will this keep my subfloor dry? Do I need to do even more to make that space habitable and dry enough to store things?
Any help would be really appreciated!