• Last Updated:
  • May 24th, 2021 9:53 pm
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[OP]
Sr. Member
May 22, 2010
651 posts
114 upvotes
Mississauga

Side Yard Swale

Between our houses we have interlocking. Our neighbours side is slightly higher than ours. As a result we've had basement leakage issues which we've had addressed having external waterproofing done in the past. Now we want to grade the interlocking between our houses to prevent water from pooling in the centre and collecting on our side. Our neighbours do not want to help and have refused to do their side. We've decided to do our half without our neighbours support.

What's the best way of going about this. We plan on:
1. Removing interlocking
2. Adding sand
3. Add gravel
3. Grading towards centre
4. Re-adding interlocking sloped to centre with a centre drain

Does that sound like the right way to go about it?

Any suggestion on getting our neighbour to pitch in and getting both sides done the correct way?
3 replies
Deal Addict
Jun 26, 2019
1414 posts
1143 upvotes
GTA
What City do you live in?

Also, how is your neighbors side lot higher? Does it have a curb, step, or wall or does it just slope into yours?
[OP]
Sr. Member
May 22, 2010
651 posts
114 upvotes
Mississauga
Mississauga. I suppose it's never been done right. Our side has settled. Neighbours side has remained higher.

There's no curb, step, or wall. It's just interlocking between the two houses.

Kind of like this: Image
Deal Addict
Jun 26, 2019
1414 posts
1143 upvotes
GTA
Casanova. wrote: Mississauga. I suppose it's never been done right. Our side has settled. Neighbours side has remained higher.

There's no curb, step, or wall. It's just interlocking between the two houses.

Kind of like this: Image
Your image didnt load, anyways, first you need to figure out how to get it out by gravity overland. The side yard should have been designed with a property line swale at 2%. If a bunch of settlement has taken place, you may need to raise a portion to provide a better slope. With landscaped you should shoot for a minimum of 2%, and for hardscape you can go with min 1%, but your landscapers better be good.

Then you need to figure out what to do with your neighbours, if what you said is true and yours settled and his didnt, maybe just building back up is the best way to deal with it. Otherwise you need to keep the property line at the existing grade and still have the lower portion sloping away from your house. So this usually creates a step or some steeper grades right at the property line.

Try to figure out overland flow first. If that doesn't work you can maybe entertain a trench drain that can outlet to daylight.

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