UnderGround Downspout Kit Installation Guide

The Hidden Downspout You Can Mow Right Over

UnderGround Downspouts are downspout extensions made to keep roof water away from your home’s foundation. It’s entirely underground removing all obstructions versus traditional downspout extensions that lay across the lawn. You can even mow right over them!

What You’ll Need: Along with your UnderGround Downspout Kit you’ll need, 4-inch solid thinwall PVC pipe (we recommend this PVC pipe), 4-inch 90-degree PVC elbow, shovel, tin snips, tarp, and gravel. 

UnderGround Downspout Extension Installation Guide

Step 1: Select a location at least 8 feet out from the downspout and dig a circular hole for the Bubbler Pop-up. Make this hole 12 inches wide by 10 inches deep. Fill the bottom of the hole with 2 inches of gravel. Make sure the top of the green lid will be flush with the dirt line when installed.

UnderGround Downspout Extension Installation Guide

Step 2: Scoop out a shallow trench from the downspout to the Bubbler Pop-up hole. For an 8-foot pipe, the trench should start approximately 4 inches deep and slope down, ending at approximately 8 inches deep. Helpful tip: Pile dirt on a large tarp to make dirt removal clean and easy.

UnderGround Downspout Extension Installation Guide

Step 3: Fit one end of the PVC pipe into the 90-degree elbow and the other end into the side of the Bubbler Pop-up. Set into place and adjust the pitch of the pipe as needed. The top of the green lid should be flush with the dirt line.

Install debris filter ice guard on downspout

Step 4: Mark on your downspout where you would like the top of the Debris Filter to be installed – usually between 10 inches to 20 inches above the dirt. Cut your downspout with a tin snips at a 45-degree angle.

UnderGround Downspout Extension Installation Guide

Step 5: Hold Debris Filter under downspout and measure the length of PVC pipe needed to connect filter to elbow. Cut pipe to size and connect one end into the elbow and the other into Debris Filter. Helpful tip: Spray paint exposed PVC pipe to match Debris Filter or exterior.

UnderGround Downspout Extension Installation Guide

Step 6: Backfill the trench around PVC pipe and Bubbler Pop-up with dirt and tamp down. Return sod or add grass seeds and you’re finished!

Order Product

  • UnderGround Downspout Extension Diverter

    UnderGround Downspout Kit

    $44.95
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  • UnderGround Downspout Lid | Waterproof.com Beaver

    UnderGround Downspout: Lid

    $18.95
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  • UnderGround Downspout Center Post

    UnderGround Downspout: Center Post

    $12.95
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  • UnderGround Downspout Bubbler Pot

    UnderGround Downspout: Pot

    $14.95
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  • Sale! Debris Filter Ice Guard

    Debris Filter / Ice Guard

    $17.96
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  • UnderGround Downspout Kits (Bulk Carton of 12)

    $324.00
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  • Bulk carton debris filters

    Debris Filter / Ice Guard (Bulk Carton of 48)

    $562.00
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  • Downspout pop-up emitter

    Bubbler Pop-Up Assembly

    $38.95
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  • Bulk carton bubbler pop-up assembly

    Bubbler Pop-Up Assembly (Bulk Carton of 18)

    $424.00
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