FREE SHIPPING on $225 or more of the SealOnce Basement System! Limited time offer!
DIY basement waterproofing system
DIY basement waterproofing | SealOnce Basement System

Easy to install, DIY basement waterproofing system that permanently dries up wet, leaky basements.

$6 per ft

* You order a custom kit based on your basement’s measurements. Free shipping on $225 or more.

Use the Official SealOnce™ Calculator to Order Your System

✔  No busting up your basement floor!

✔  Easy to install!

✔  40+ years of proven success!

✔  Our exclusive SealOnce Adhesive bonds watertight in wet or dry conditions!

AS SEEN IN:

HOW TO ORDER:

Use our project calculator below to create your custom SealOnce kit specific for your basement’s measurements.

Use the Official SealOnce™ Calculator
to Order Your Custom Kit

HOW TO MEASURE:

This video shows you how to measure your basement’s linear footage without moving any furniture. It’s simple!

If you have any questions while ordering please call us at 651-644-2000. We’re available Monday throught Friday.

Already know the parts you need?

When soil around your foundation becomes water-saturated, hydrostatic pressure forces water up through the joint where your floor and walls meet. The SealOnce Basement System can cure that problem. It’s designed as a hollow PVC baseboard to collect the seeping water and quietly drain it to your floor drain or sump pump. These are the parts that make up the SealOnce Basement System.

4-foot Main Sections

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

SealOnce Adhesive

Our exclusive waterproofing sealant bonds water-tight in wet or dry conditions! You need one tube of adhesive per main section.

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. No need to miter corners like other systems.

Butt Joints

Connects main sections end-to-end sealing the channel water-tight. Come in packs of 5.

End Cap

End caps are used to dead-end the system.

Drain Port

23-inch drain port connects the main section to a sump pump or floor drain.

New! SealOnce Tool Kit

Us the bullnose tools to create a watertight seal and square-nose tool for easy clean up.

EASY TO INSTALL:

SealOnce Basement System is an easy weekend project. No special tools or skills required. With every order you’ll get the full installation guide walking you through step-by-step how to install the DIY basement waterproofing system. If you have any questions during your install we’re here to help. Just give us a call at 651-644-2000 for quick support.

Clean Floor Properly

Sweep the concrete floor clean. Next, clean the bare concrete floor by washing the surface with clean water and a sponge to remove all dirt and dust.

Layout System

Cut and trial fit the main sections along the basement walls. Place inside and outside corners where needed. Use a tin snips, hacksaw or miter saw to cut the main sections as needed.

Bond Sections to the Concrete

The bottom bead of adhesive is your system’s structural bond to the concrete floor. Start by turning the main section over and apply a tall, thick bead of adhesive (about the size of your thumb) to the bottom of the main section.

Install Pre-Molded Corners

Apply SealOnce Adhesive on both main sections. Inside corners are easy to install when dropped down from the top. Seal the corner’s edges and caulk the bottom for a watertight bond.

Apply Finishing Seal

Caulk the floor joint with enough pressure to force some SealOnce Adhesive under the system. Immediately follow to next step…

Seal the System Water-tight

Slick down the finishing bead of adhesive our NEW Perfect SealOnce Bullnose Tool. Holding the tool in this position slowly drag it all the way down the system leaving a perfect seal. The finishing seal is your water-tight seal of your system.

HOW IT WORKS:

The 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.

Millions of feet installed across the US and Canada since 1965…

  • Hoover Dam

  • Fort Knox

  • US Embassy

  • Mercer County Housing

  • Minnesota Historical Society

  • Several colleges and universities across the United States.

REAL PEOPLE. REAL SUCCESS.

Have not had a drop of water on the floor since and we can once againuse the room to store things without worry of water damage. I was so impressed that I installed it in the other areas of the basement. I’m a woman and I did all this with NO help – very easy!

Peggy Yehl

I did the basement of my fiance’s (now wife) house in Madison, WI 3 years ago before she sold it to move in with me. It was a mid-50’s house on a small lot. The surrounding neighbor’s yards all were of higher elevation and flowed into her yard.

One neighbors house was merely 10′ away and both rooflines dumped into this narrow breezeway. This was also the only avenue of escape for all of the water in the backyard. She often joked about her “water feature” which was located in the basement.

Over the course of 12 years she spent 1000’s of dollars on gutters and landscaping, including hiring a landscape architect who installed many deep-rooted plants and even a French drain. Even with all of this she still had problems. Being a contractor I knew that there had to be something I could do, and after much research I found this amazing product.

It was easy to order, easy to install and has worked amazingly!! Drying up the basement allowed me to fix all of the ruined drywall, lay new carpet and flooring, and reclaim the basement as usable space in a tiny 750 square foot home. Directions are very simple and the average do-it-yourselfer could perform it themselves.

Bart Bartos

I installed this system in my finished basement in spring of 2016 after the rainy season. It was tested last weekend during the record rainfall in MO. The system worked flawlessly.

James Meeks

Nice quick and easy – anyone can do it and best of all save a lot of money!!

Mark Mullet

Thought you might like to see how your system turned out for us on a rental house we own. We had water all the time in this basement and decided to tackle the issue ourselves. We are seniors and found it to be very easy to do. Instructions were great. We had to work in a lot of water and that did make the job more difficult but with your system and another product to repair the cracks in the floor and then coat the entire floor we now have a dry basement. The total transformation is incredible. I am glad that we researched and found your system. Thanks for a great product for the do it yourselfers.

Ken & Patty Merritt

NEW! PERFECT SEALONCE TOOL

Drying up your wet basement is easier than ever! We designed and manufacture the Perfect SealOnce Tools to make installation easy and mess free. Perfect SealOnce Tool Kit includes two bullnose tools to create a watertight seal. Use the square-nose tool for easy clean up.

Drying up your wet basement is easier than ever! We designed and manufacture the Perfect SealOnce Tools to make installation easy and mess free. Perfect SealOnce Tool Kit includes two bullnose tools to create a watertight seal. Use the square-nose tool for easy clean up.

SealOnce Main Section Dimensions:

TALL: 4-1/4″
BASE WIDTH: 1″
OVERALL WIDTH ONCE INSTALLED: 1-1/2″

COLOR: Beige
(You could paint the system with a flat latex paint if desired.)

THICKNESS: .080″

SealOnce Adhesive:

New & improved 3rd generation waterproofing sealant! Bonds in wet or dry condition!

SIZE: Standard 10oz. Caulking Tubes
COLOR: Beige

COMPARED TO OTHER OPTIONS SEALONCE IS THE EASY CHOICE:

COMMON HOMEOWNER QUESTIONS:

For many homeowners the SealOnce Basement System is the first time they’ve had access to a professional-grade basement water control system they can install themselves and often have a few questions. Below are answers to the most common questions first time homewoners ask.

How will water flow if my floor is uneven?

SealOnce Basement System stands 4-inches tall to allow for uneven floors. As water around your foundation rises, it begins to flow into the channel. Water flows naturally toward any low spot or drain.

Will water remain standing in low areas of my SealOnce Basement System?

When the water stops flowing out the drain or sump pump, you know that the SealOnce Basment System has finished its work. With the water level now lower than the floor, any water left standing in the channel flows back out through the weep holes or joint where the floor and walls meet for poured foundations.

Will the SealOnce Basement System require maintenance?

The SealOnce Basement System is made of PVC, the same as the water pipes in your home. An attribute to PVC is that it will not support algea that causes odors. The SealOnce Basement System itself needs to maintenance.

How long will the SealOnce Basement System last?

The SealOnce Basement System is a permanent installation. Systems installed in 1965 are working today, just the way they did when originally installed.

Why do I need to drill weep holes?

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.

How will the SealOnce Basement System work with poured concrete, brick or stone 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.

Can I finish my basement after installing the SealOnce Basement System?

Absolutely! You can easily box out and frame around the SealOnce Basement System, install drywall and other finishings in your new basement.

Still have questions?
Call us. We’re here to help.

(651) 644-2000