How do I keep roof water away from my foundation?

A roof collects a lot of water in a storm, and gutters bring all of it down to a few spots next to your house. If that water stays at the foundation, it soaks the soil under the slab edge or runs into the crawlspace. Here is how we would look at it on a Roseville property, and what you can check before you call anyone.

The plain answer

Roof water gets to a foundation in three main ways. It spills over gutters that are clogged or too small. It comes out of a downspout right at the base of the wall. Or it lands on soil that slopes back toward the house. Fix those three and most foundation water problems go away.

In practice that means gutters that are clean and pitched toward the downspouts, and downspouts that carry water several feet from the house before letting it go. It also means soil that falls away from the walls on every side. A splash block is better than nothing, but it only moves water a short distance. On many lots the better fix is to connect each downspout to solid buried pipe and run it to a place where the water can drain or soak in safely, away from the house and away from your neighbor's.

What changes the answer on a real Roseville property

The soil matters most. Much of Roseville and the surrounding area sits on clay, often with a hard layer not far below the surface. Clay takes in water slowly, swells when it is wet and shrinks and cracks through the dry summer. Water dumped beside a foundation in clay doesn't drain away quickly. It sits there and works its way along the slab edge or under a raised floor. That hard layer can also stop water from going deeper, so a soak pit that would work well in sandy ground may fill up and stay full here.

The weather matters too. Most of our rain comes in winter, often in a few heavy storms. A setup that looks fine all summer gets its real test on one wet night in January.

Then there is the house itself. Many newer neighborhoods have slab homes with narrow side yards. Those side yards often carry water from two roofs, yours and your neighbor's, with nowhere obvious to send it. Older homes near downtown are more likely to have raised floors and crawlspaces, where the warning sign is standing water or damp soil under the house. Landscaping changes things as well. A planter bed built against the wall, mulch piled up over the bottom of the stucco, or a patio poured with a slight tilt toward the house can each hold water against the foundation.

What you can check yourself

The best time to look is during or just after a good rain. Put on a jacket and walk around the house.

Watch the gutters. Water pouring over the front edge usually means a clog, a sag or a downspout that can't keep up. Look at where each downspout lets go. If water pools within a few feet of the wall, it needs to go farther. Note where puddles form and how long they last. Ground that is still soggy a day later next to the house is telling you something.

Check the soil line. On stucco homes there is a metal strip near the bottom of the wall called a weep screed. It should stay visible above the soil and mulch, not buried. If you have a crawlspace, look in after a storm for standing water, wet soil or a white chalky crust on the foundation walls, which is mineral residue left by water passing through.

In the dry months you can test buried downspout lines with a garden hose. Run water into the downspout and go find where it comes out. If it backs up at the top or never shows up at the outlet, the pipe is clogged, crushed or disconnected.

When it needs a professional

Some fixes are easy to do yourself: cleaning gutters, adding extensions, pulling mulch back from the wall. Others are worth handing off.

Call someone if water still stands near the house a day after rain, if your crawlspace gets wet in most storms, or if buried downspout lines keep clogging. The same goes when there's no clear low spot on the lot to send water to, when the ground near the house needs to be reshaped, or when water from a neighboring property is part of the problem. Those jobs mean digging, setting pipe at the right fall and making sure the water ends up somewhere it won't cause a new problem.

If you see foundation cracks that are getting wider, floors that are going out of level or doors that have started sticking, have the structure looked at as well. We deal with the water side. Moving the water away is often part of the answer, but it doesn't replace an assessment of the foundation itself.

How this connects to the work we do

Most roof water problems we see in Roseville are handled with Downspout Drainage. We connect each downspout to solid buried pipe and run it to a suitable outlet. Depending on the lot and local rules, that might be the curb, a pop-up emitter out in the yard, or a lower part of the property. Solid pipe matters here, because the goal is to carry the water away, not leak it back into the soil beside the house.

When water also moves through the ground toward the house, French Drain Installation is often added. A trench with perforated pipe and gravel catches water before it reaches the foundation and carries it off. This is common in side yards and along the uphill side of a house. Sometimes the ground needs to be reshaped first so the surface water runs the right way.

A visit starts with a walk around the property. We look at the gutters, the downspouts, the slope of the ground and where water has been collecting. We may run water through a downspout to see where it goes. Then we explain what we found and whether a repair will do or something new is needed, and you decide from there.