Tag: downspout

Thinking About Drainage

We’re slowly getting settled into the basement. Even after a few weeks, we still have a lot of stuff strewn about upstairs that we’re working on moving, putting into boxes, or outright getting rid of. Sarah’s been on an IKEA kick, loading up our humble abode with storage, since we’re completely lacking in the closet department. It’s starting to feel like home, though it definitely feels like a basement. Meanwhile, we’re thinking about next steps. After all, the whole point of moving into the basement is to get the rest of the project done. The next major step is second floor demo. We want to get that done before winter hits, mostly so that we can work inside all winter. However, we have to finish the aforementioned moving and clearing before that happens. We’ve also decided we need to make our drainage project happen sooner rather than later.

The drainage project was something we were planning to do in the landscaping phase, but the rainy weather has underscored that we need to control the flow of water into our basement. Essentially, it’s a just-below-grade weeping system that will wrap around the front and side of our house. The reason this was slated for the landscaping phase is that the goal is to drain this into a rain garden/water feature in the back yard. However, right now our back yard is mostly patio and we plan to keep it that way so we can bring in the parade of dumpsters and trucks that will get this project done. Instead, we’ll drain into our canceled catch basin for the time being and redirect it later. Our catch basin is filled with gravel, but it can still hold a couple-few hundred gallons of water, keep it away from the house, and drain into subsoil, all of which are critical to our basement staying dry.

The plan is to dig up the cracked and crumbling sidewalk along the side of the house, dig a trench that slopes to the center about a foot deep, and put down a plastic landscaping barrier that’s caulked to both our house and the neighbors. We’ll put perforated pipe in the bottom and backfill with stone. Lastly we’ll put in paver step stones in place of the sidewalk. As I said, the pipe will drain to the catch basin in the back yard for the time being and eventually drain to a water feature. We’ll put in connections so that when we redo the roof and gutters, the downspouts can drain into the system as well.

The drainage will eventually continue across the front of the house, minus the pavers, since we’re putting a new front porch over it. Ideally we’d have a proper exterior weeping system, which is a drainage pipe around the outside of the foundation at the bottom of the basement wall. Unfortunately, we’re very close to our neighbors. The North side of our house literally sits on the property line and both sides are between 3-4 feet away from the houses next door. Excavating down to the bottom of the 120-year-old brick wall risks not only our own structure, but the neighbors as well. The drainage project we’re doing is basically a compromise because the pipe won’t be below the frost line. If it got cold enough, especially after a snowmelt or heavy rain, it’s possible for the whole thing to freeze up. That said we believe it will keep the vast majority of water away from our foundation and out of our basement.

The dumpster is on order, and the project kicks off in a couple days. We need to get everything dug out in a week so that the dumpster can go back on time, but after the basement dig out, I’m not too worried about that. Once that’s done we need to get the barrier and pipe installed, then get some pea gravel delivered. Finally, we need to pick out some pavers. That’s the fun part.

Unexpected Water Management

In my post about the sump pump, I discussed our concerns about water in the basement. Those concerns have proved well founded, because after some heavy Spring rains, it happened. Our interior weeping system directs water under the concrete slab to the sump pit and the sump pump pumps it away, and this system is working great. However, water doesn’t always come from below. Because of the thick, clay soil, water following the path of least resistance can come right through the brick basement walls. That water is coming in above the footer curb in the basement and then drains onto the top of the basement floor, bypassing the weeping system completely.

There are ways we could have avoided this. The preferred method is to excavate around the outside of the house and install a water barrier on the outside of the basement walls, but our house is less than four feet from the neighboring houses to either side, risking structural collapse of both our basement and theirs. Another method is installing a dimpled plastic membrane on the inside of the basement walls that provides a path for water to drain down below the slab and into the interior weeping system. We didn’t do that for a couple reasons. First is the potential for damaging the bricks, both from persistent water and from freezing. Second is that the membrane would have to wrap over the footer curb, and we’d have to frame walls in front of it, further reducing our floor space (by about 50 square feet). While we do plan to insulate inside the brick walls, we’re going to do so without a vapor barrier, so that the bricks can dry if they get wet. The interior-facing side of the footer curb will remain exposed, or at most covered by trim.

Old downspout accordion

Old downspout accordion

While we’re exploring ways to divert water that comes through the walls, the bigger focus is on keeping water away from the basement walls in the first place. Recently it poured, and I discovered that the downspout I’d put in after we removed the back porch was clogged, causing a fountain at the back corner of the house right where we were getting most of the water. Once I fixed that, the downspout was splashing about fifteen feet into the back yard… and then running across the patio to the other corner of the house. Worse still, our neighbors’ downspout was clogged and all the water from half their house was cascading into the gangway. The downspout we had on that side was running across the gangway and wasn’t sloped away from the house, so water was draining to the same corner. I got the water from both our gutters to divert to the stone-filled catch basin, but something more permanent was needed.

I ran to Home Depot and got some supplies, then got up on a ladder and reconfigured our downspouts. The gutter on the gangway side now drains across the back of the house between the first and second story, where it joins with the other downspout. It then drains about twenty feet from the house, but I plan to extend that to thirty. I also unclogged the neighbors gutter and ended the waterfall in the gangway. Since making this change we haven’t seen additional water, but I’m not yet convinced we’ve solved the problem. I have some other steps I can take if we see any more water.