The Brew Cabin

Posted: **Thu Oct 26, 2017 8:50 pm**

Hi,

My first post on here.

Moved into new house a few months ago, ground floor is suspended floor with crawl space and concrete foundation. I have found that along the back half of the house there is a water on the subfloor (varies up to 1 inch in depth).

I have had the drains CCTV'd and no issues there except a small crack in the soil pipe connection just below ground level which doesn't actually leak anything when toilet is flushed. Level varies so doubt it is mains water. The walls are also wet which leads me to think it is a combination of ground water and surface run off. The soil is very dense/ wet clay. The patio was running towards the house and you can see the driveway from my garage also slopes towards the house.

I am trying to figure out what the best solution is. My thoughts were.

1) Put a channel drain across drive at bottom of slope from garage.

2) Dig out soil along the back of the house and just around the gulley near drive and possibly waterproof paint the wall? I was then considering re-filling with appropriately sized gravel/ membrane. Possibly also perforated pipe and connecting to drainage to act as land/ french drain.

3) Re-lay patio so water is directed towards garden.

Have attached a few pictures of the current situation. You will see I've pulled a few of the flags up and excavated small areas to investigate.

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Any help and advice would be most appreciated!

Thanks,

Dan

Posted: **Thu Oct 26, 2017 9:28 pm**

What problem is the water causing in the subject floor

Posted: **Thu Oct 26, 2017 9:45 pm**

Hi,

No problem as such other than a length of wood (looks like it was retrofitted possibly to help prevent problems with a wobbling washing machine). But surely having water under the house isn't good?

Couple of pics below, ignore the dye that was poured onto the surrounding ground to check for water ingress (you can see lots of it).

Thanks,

Posted: **Thu Oct 26, 2017 10:11 pm**

Like you've already suggested, stop all water getting near the house make sure all drains gullies etc are working correctly

Posted: **Fri Oct 27, 2017 9:01 am**

Could be groundwater seeping in. You can tank it, waterproof frim inside...expensive.

Posted: **Sun Oct 29, 2017 10:33 pm**

Hi,

I think it might be groundwater too, I am going to dig up the patio and re-lay it so it drains away from the house. Would digging out the clay soil along the back of it and replacing with gravel help matters?

I have excavated around the drain, any idea how I could go about connecting up a channel drain to this. Likely I will replace the old clay gulley so I can get the downspouts and kitchen waste pipes under the grids.

The channel drain would be running literally infront of the gullet across the driveway. Unsure if I can tap into the plastic gulley from the channel drain or if I need to fit a mini inspection chamber?

Cheers,

Dan

Posted: **Tue Oct 31, 2017 7:24 am**

Cut out side of the gully the size if your aco.
Placing shingle against house wall will encourage water to head that way. As you say reverse slabs, or install aco. Look at tanking it also.

Posted: **Sat Nov 04, 2017 8:34 am**

If you pump away the water does it come straight back or only after prolonged/heavy rains?

Was thinking if you have a deep enough invert level you could simply drain the water from dumbfloor?

Posted: **Sat Nov 04, 2017 8:35 am**

*subfloor

Posted: **Sat Nov 04, 2017 9:12 am**

jwill wrote:If you pump away the water does it come straight back or only after prolonged/heavy rains?

Was thinking if you have a deep enough invert level you could simply drain the water from dumbfloor?

To where? Groundwater will keep on coming. Usually tanking from outside, or sealing from inside will remedy it. A fall to a sump then pumped can control it, depends what Dan ontends to use it for and if viable options. As stated it can become expensive

Posted: **Sat Nov 04, 2017 12:50 pm**

If you had a low point under subfloor where you could run some perf pipe could this not be connected into a storm water drain if invert level allowed? Not to stop the water coming but just to drain it when it does come.

Posted: **Sun Nov 05, 2017 9:14 am**

Hi all,

Thanks for the replies. Update is I have had the clay pipe P trap and gulley replaced with plastic and they have fed a channel drain into this. Also had cracked rest bend fixed on soil pipe. Slightly annoyed they didn't install the second aco for the rest of the drive, suppose I can always add that in though.

Now, where my downspout and 2x kitchen wastes empty to the gulley I need to sort out how they enter here as some spill behind the back (hence the bit of plastic gutter). Now I noticed that they have fitted it lengthways along the wall whereas a lot of pictures on the internet showed it at 90 degrees to this, is there a correct way? If I rotated it could I use the 2 boss inlets on the sides for the 2 kitchen 40mm waste feeds or is it meant for a gutter downspout? Quite hard to find out what they are meant to be used for.

As you can see water still gathering here, next steps will be to re-pave and then get the patio running the opposite way, too wet for that today though!

Thanks,

Dan

Posted: **Sun Nov 05, 2017 10:28 am**

Looks ok to me. Just extend the waste and rain water pipes into gully. You can cut holes in the gully top

Posted: **Sun Nov 05, 2017 11:09 am**

personally i wouldnt do this as it is not a roddable gully
rather the leaves and crap sit on the grate than go straight down into the system
cheers LLL

Posted: **Sun Nov 05, 2017 12:24 pm**

Soil pipe = trapped gully.

The Brew Cabin

Water under subfloor - best solution?