outside water issues, hydrostatic pressure of basement stairs wall, trench size
outside water issues, hydrostatic pressure of basement stairs wall, trench size
(OP)
My tiny backyard slopes down towards the back of my house. I have a basement stair case with a cinder block wall. There is an aluminum awning over the basement stairs. I put a gutter on the awning to redirect water to my driveway because the side of my house slopes away from the foundation. This has helped but there has been damage to my sidewalk and the cinder block wall.
When it rains, the water runs down to the sidewalk and seeps into the earth and starts leaking about half way down the wall. I need to redirect this water to the side of my house so it will flow away from the house.
I need to tear out the side walk because it tilts towards the house/wall after 60 years of run off from the awning. I was thinking about digging a 2 x 2 foot trench and putting in a level pvc pipe with holes in the bottom the runs 18 feet(width of my house) and redirect it to a solid pipe on the side of house and slope it away from the house.
Does this sound like it will work properly? Is a 2x2 foot trench big enough? I can't dig 10 feet down unless I want to tear up most of my driveway and I can't afford it.
If so, should I use 4 or 6 inch pvc? I plan on filling the trench with concrete sand and then a could of inches of small stones and 2x2 foot pavers(instead of pouring a concrete sidewalk).
I have slotted ADS pipe That I'd like to use but I was told it will get crushed when after continued walking on the pavers.
Thanks for any info/ideas/comments.
John
When it rains, the water runs down to the sidewalk and seeps into the earth and starts leaking about half way down the wall. I need to redirect this water to the side of my house so it will flow away from the house.
I need to tear out the side walk because it tilts towards the house/wall after 60 years of run off from the awning. I was thinking about digging a 2 x 2 foot trench and putting in a level pvc pipe with holes in the bottom the runs 18 feet(width of my house) and redirect it to a solid pipe on the side of house and slope it away from the house.
Does this sound like it will work properly? Is a 2x2 foot trench big enough? I can't dig 10 feet down unless I want to tear up most of my driveway and I can't afford it.
If so, should I use 4 or 6 inch pvc? I plan on filling the trench with concrete sand and then a could of inches of small stones and 2x2 foot pavers(instead of pouring a concrete sidewalk).
I have slotted ADS pipe That I'd like to use but I was told it will get crushed when after continued walking on the pavers.
Thanks for any info/ideas/comments.
John





RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
Please let me know if there's a way to send multiple pictures in a single post.
thx
john
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
Sand will accept water more slowly than open graded rock, but it is permanent.
If it is possible to re-grade the surface area also, or at least level it up, I'd "waterproof" the full backfill surface away from the trench top, including the apparent gardens there. I did this to the entire perimeter area of the house backfill (that's at least 10 feet out). In my case I removed all sod re-graded as necessary, used a rototiller for the mixing and re-placed the sod. Several of my clients have done this also. You may want to do some crude permeability studies, such as treated soil in a tin can with holes punched in the bottom to find a suitable mix. Too much bentonite and you can have a real mess. I loves water and expands to fill voids. I used a mix of one part powdered bentonite (drillers mud powder) to 5 parts of a sandy soil here. I treated about 4 inches of depth below sod and around sidewalk areas. Do not use granulated bentonite as sometimes is used for driller's mud, since a thorough mix is needed. In that can with about 2 inches of treated soil in it, the can full of water should show no noticeable water level drop once things are stabilized. Watch it for at least a day. Bentonite can be obtained at most larger plumbing material supply firms.
Bentonite is a natural clay so grass and plants grow nicely in it. Remember digging into that zone in time with new plants, gardens, etc. can destroy its integrity. Use that mix all around joints of slabs also.
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
I forgot a detail with sand backfill. The sand must not get into the pipe. Use a pipe with sock of a slotted pipe (like 1/6" width slots).
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
I'm going to have to take out the sidewalk since it slants towards the house.
I'll pull the entire garden out next month if you think it will help.
cvg, are you saying I should get something like this?
http://www.homedepot.com/p/Pro-Series-5-in-x-40-in...
I like this grate kit solution better since I can't dig to the bottom of the wall and it would be much easier to install this kit than digging a trench.
My new idea to to first install this channel grate kit parallel to my sidewalk and redirect the water to a pipe that I'll trench in after cutting out part of my driveway.
I will later jack hammer up the sidewalk and fill will some soil the OG mentions above. This sounds like the simplest solution and it wouldn't be that difficult to implement and test.
Any thoughts?
Thanks again.
jb
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
http://www.homedepot.com/p/9-in-x-9-in-Black-Catch...
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
http://www.homedepot.com/p/Pavestone-24-in-x-24-in...
If I dig a trench, I will use concrete sand. I have ADS slotted pipe and a sock for the pipe if I dig a trench. PVC with holes at the bottom was another option. Not sure how the ADS pipe will hold up with concrete sand and pavers on top.
jb
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
My only concern with that 9x9 drain is that it might not collect as much water as a longer thinner drain. My entire back (about 20 feet) slope towards the house.
I feel like I should have a 20 foot 6 inch channel grate kit installed.
If I installed the 9x9, should I need to slope all the landscaping towards the drain?
Thanks for your help.
jb
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size
RE: outside water issues, hydrostatic pressure of basement stairs wall, trench size