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DIY basement waterproofing | SealOnce Basement System

$6 per ft average cost

Nation’s #1 DIY basement waterproofing system. Start your project using the latest in foundation waterproofing technology! Easy to install! Permanent results!

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How to Measure a Basement (60 sec. video)

Need replacement parts or adding on to an existing system? Click the button below to order…

DIY basement waterproofing channel

Height: 4-1/4″
Depth: The bottom of the channel will sit 1-1/2″ to 1-3/4″ away from the wall once installed. Top of the channel will rest against the wall.

How It Works

do it yourself basement waterproofing systemThe most common mistake do-it-yourself homeowners make when waterproofing their basement is trying to push or stop the water with paints or patch-its. Waterproofing paints or membranes are hugely labor intensive and never last longterm. To permanently dry up your wet basement you need to think like the PROs! The SealOnce Basement System is the ideal do-it-yourself remedy to a wet basement because it relieves hydrostatic pressure and properly drains and collects water seepage just like the PRO’s without the big price tag!

As the soil around your foundation becomes water-saturated, hydrostatic pressure forces water through the joint where your floor and wall meet. SealOnce Basement System can cure that problem. Designed as a hollow baseboard, this easy to install DIY basement waterproofing channel collects the seeping water and quietly drains it to your floor drain or sump pump.

The only skill needed for installation is the ability to follow directions. Just seal the pre-molded corners and easy to handle main sections to the floor using the SealOnce Adhesive. With the SealOnce Basement System in place, walls can easily be paneled or finished. Drying up your wet basement is the first step towards a clean and healthy room ready for living, storage, and play. The SealOnce Basement System can turn your wet basement into a comfortable room suitable for your home and family.

Easy DIY Basement Waterproofing Installation Guide

Easy to install do-it-yourself basement waterproofing! Only skill needed is the ability to follow instructions! We’ll walk you through step-by-step how to waterproof a basement with our easy follow installation guide included with every order!

How To Measure Your Basement Without Moving Any Furniture!

1 – Measure the distance between the north and south walls. This dimension will have all the detailed measurements of your north and south walls

2 – Measure the distance between the east and west walls. If you’re doing your entire basement, just add all four walls together to equal your total linear footage. Enter this number into the calucator.

3 – Count the number of inside and outside corners in your basement. Enter both number into the calculator and click caluclate!



We’ve helped over 10,000 homeowners
dry up their wet basement for under $1000!

We are a third generation family-owned and operated business dating back to 1965! SealOnce Basement System is proudly right here in the USA. There is over 7,000,000 feet of our baseboard-style systems installed across the Nation. Our systems have been installed at the Hoover Dam, Fort Knox, US Embassy, Mercer County Housing, several prestige universities and colleges across the United States.

“Finished installing my waterproofing last week and two heavy rains later not a single drop! Great product!”



“Hello! I just wanted to let you know I installed this system in my basement 12 years ago. It is still holding up. I have had a dry basement ever since. Thank you for a great product! It was worth every penny of the investment!”

Kerry Green


“I installed the SealOnce do-it-yourself basement system. Since then, it has stood up to hurricane Irene and hurricane Sandy. IT WORKS GREAT!”

Henry T.

Woolrich, New Jersey

Poured Foundation Walls

SealOnce Basement System works with any type of basement wall because the main sections are not glued to the walls. They simply rest against the face of basement walls. The top of the system is left open to allow any water seepage from the face of the walls to enter the system. The top the main section curls back creating a mini-trough directing the water behind and into the channel.

Block Wall Foundations

Hydrostatic pressure is relieved in block wall foundations by drilling weep holes in the concrete block cavities at floor level. The hollow DIY basement waterproofing channel collects the seepage. The baseboard is not attached to the wall, it allows air to circulate within the block cavities to help keep them dry. It also provides a source of disposal for upper-wall moisture to enter the channel.

4 ft Main Section

Open back collects water for full length of basement – quick drain channel design! Easy to handle 4-foot sections.

SealOnce Adhesive

NEW! Exclusive waterproofing sealant bonds water-tight in wet or dry conditions!

Inside Corner

Pre-molded inside corners shortens install time and makes for a clean, professional finished look!

Outside Corner

Easy to install pre-molded outside corner.

Butt Joint

Connects main sections end-to-end sealing the channel water-tight.

End Cap

End caps are used to dead-end the system.

Drain Port

Connects the system to a sump pump or floor drain.

Need to order replacement parts?

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