Not long ago we responded to a reader with a question about whether a half-round pipe she discovered in her backyard was in fact a French drain.

We speculated that it might be a feeble attempt to redirect groundwater from the house, but it was definitely not a French drain. We explained that a simple French drain was a trench filled with gravel used to control groundwater.

We suggested that the drainpipe could do double duty by collecting roof water during rainstorms and channeling water into the drainage system. This raised the hackles of two readers, one a landscape contractor, the other a landscape architect. Both said dumping roof water into the French drainage system is a bad idea. On reflection, we agree.

The purpose of a French drain is to direct groundwater away from the foundation. The filtration cloth, perforated pipe and drain rock allow groundwater to percolate to the pipe, and with the proper slope to discharge it away from the foundation. The volume of water discharged into the system during a heavy rain risks directing water toward the foundation instead of away from it.

It’s better to move water away from the foundation either by extending the ends of the downspouts far enough into the yard, or discharging the rainwater into a solid pipe that discharges downhill into a sump or collection area. It’s OK to place the solid pipe in the same trench as the perforated pipe. The perforated pipe should rest on the bottom with pipe holes pointed downward, topped by a layer of gravel, then the solid pipe, more rock and finally a top layer of sand.

The pros didn’t like our suggestion to place a 2-inch bed of rock under the pipe, but a number of cities require it in their local building codes. We go with the cities. The purpose of the filter fabric is to keep fine materials out of the pipe. In our view there is no quicker path to system failure than for the pipe holes to plug.

Finally, one pro took issue with our statement that digging the trench is a "fair amount of hard work," countering: "It takes an enormous amount of extremely hard work." We’re not going to argue about degree.

In another column we responded to a reader with a sticking door. We told him how to adjust the door to cure the problem. In response to this column a hinge manufacturer had another solution: an adjustable hinge. Kevin put this new-on-the-market product through its paces. We like it. It’s a piece of cake to install and adjusts easily up to about 3/16 inch side-to-side and up and down. Check it out at

Show Comments Hide Comments


Sign up for Inman’s Morning Headlines
What you need to know to start your day with all the latest industry developments
By submitting your email address, you agree to receive marketing emails from Inman.
Thank you for subscribing to Morning Headlines.
Back to top
Only 3 days left to register for Inman Connect Las Vegas before prices go up! Don't miss the premier event for real estate pros.Register Now ×
Limited Time Offer: Get 1 year of Inman Select for $199SUBSCRIBE×
Log in
If you created your account with Google or Facebook
Don't have an account?
Forgot your password?
No Problem

Simply enter the email address you used to create your account and click "Reset Password". You will receive additional instructions via email.

Forgot your username? If so please contact customer support at (510) 658-9252

Password Reset Confirmation

Password Reset Instructions have been sent to

Subscribe to The Weekender
Get the week's leading headlines delivered straight to your inbox.
Top headlines from around the real estate industry. Breaking news as it happens.
15 stories covering tech, special reports, video and opinion.
Unique features from hacker profiles to portal watch and video interviews.
Unique features from hacker profiles to portal watch and video interviews.
It looks like you’re already a Select Member!
To subscribe to exclusive newsletters, visit your email preferences in the account settings.
Up-to-the-minute news and interviews in your inbox, ticket discounts for Inman events and more
1-Step CheckoutPay with a credit card
By continuing, you agree to Inman’s Terms of Use and Privacy Policy.

You will be charged . Your subscription will automatically renew for on . For more details on our payment terms and how to cancel, click here.

Interested in a group subscription?
Finish setting up your subscription