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SealOnce Basement System

Custom do-it-yourself basement waterproofing channel

$6 per ft*

*Average price per foot includes main sections, components and adhesive. To get a custom price for your DIY basement waterproofing kit click the button.

Do-it-yourself waterproofing channel trusted by homeowners to dry up their wet basement since 1965. Waterproof your wet basement with our easy to install SealOnce Basement System, ideal for basement’s that leak water through the joint where the floor and walls meet. Hollow baseboard channel is bonded water-tight to your concrete floor to collect seeping water and drain it away to your sump pump or floor drain.

No busting up your basement floor.
No trenching.
No excavating your home.
Odorless adhesive.
Easy DIY installation.
Backed by thousands of happy homeowners.

SealOnce Basement Waterproofing System dimensions

Get Your Custom Quote

Enter your basement info here

SealOnce Basement System

Your Custom Kit


Item Name Qty

Main Sections (4-foot lengths)


Waterproofing Adhesive


Inside Corners


Outside Corners


Butt-joint connectors (5-pack)


End Caps


Drain Port (23-inch length)


Tool Kit


*You can adjust quantities after adding items to the cart.


How to waterproof your wet leaky basement

SealOnce Basement System: A permanent do-it-yourself basement waterproofing system.

SealOnce Basement System is a permanent basement waterproofing option for homeowners. SealOnce Basement System works by collecting the seeping water coming in through the joint where the floor and walls meet. SealOnce Basement System is a narrow, hollow baseboard channel, with the widest point at the bottom being 1-1/2″ out from your basement walls. This tall, narrow channel allows for a small amount water inside the system to build up quickly in height versus the way water plains out over your basement floor staying stagnate in puddles. As water builds up in height, it’s naturally self-leveling seeking the lowest point in the basement, which will be your drain outlet for the SealOnce Basement System – either your sump pump or floor drain.


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 homeowners 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 no 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.


We’ll walk you through step-by-step on how to waterproof your basement with the SealOnce Basement System. From how to prep your floor, help installation tips and detailed photos and video on how to seal the system water-tight for a permanent fix to your wet, leaky basement. You don’t need any special tools or experience to install the system. If you have any questions or concerns during installation give us a call at 651-644-2000 and our tem of experts will be able to provide answers.

How to waterproofing your basement yourself - diy options
Prep basement floor for installation of DIY basement waterproofing channel

Prep Your Basement

Proper preperation of your basement floor is key to installing the system. You’ll start by relieving the hydrostatic pressure in the basement walls. Next, you’ll clean the floor very well with just water and a sponge to remove all fine dust and debris. 

How to waterproof your wet leaky basement

Install SealOnce Basement System Channel

You’ll receive detailed instruction booklet with your order that will walk you though each step in detail to give you the confidence to waterproof your basement like a professional. Click the button below to see the full guide.

how to waterproof basement and drain water out of foundation

Drain Your System

Once you’ve installed your SealOnce Basement channel around the perimeter of your basement, you’ll need to drain it to your sump pump pit or floor drain. We’ll show you how to connect the system using our Drain Port to your choosen drain outlet. 

Waterproof your basement permanently for less than $1,000 – and it only takes a weekend!

SealOnce Basement System is ideal for basements that leak water through the joint were the floor and walls meet. 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 without busting up your floor.


Millions of feet installed across the US and Canada since 1965. From the Hoover Dam, Fort Knox, US Embassy, Mercer County Housing, Minnesota Historical Society and several colleges and universities across the United States.

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 Y.

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 B.

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 M.

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

Mark M.

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 M.

SealOnce Basement System is a hollow baseboard waterproofing channel that collects seeping water and drains it away.

No busting up your basement floor or need to excavate around your foundation to fix your wet basement with our system. SealOnce Basement System is permanent fix to your wet basement. Create your custom kit based on your basement’s measurements. 

  • SealOnce Basement System 4ft Main Section

    SealOnce Basement System: 4ft Main Section

  • SealOnce Basement System Inside Corner

    SealOnce Basement System: Inside Corner

  • SealOnce Basement System Outside Corner

    SealOnce Basement System: Outside Corner

  • Water X-Tract Basement Waterproofing end cap

    SealOnce Basement System: End Cap

  • SealOnce Basement System Butt Joints

    SealOnce Basement System: Butt Joints (5 Pack)

  • SealOnce Adhesive | Basement Waterproofing Sealer

    SealOnce Waterproofing Adhesive (10oz)

  • SealOnce Basement Waterproofing baseboard channel do-it-yourself system

    SealOnce Basement System: Drain Port (23in)

  • SealOnce Basement Waterproofing baseboard channel do-it-yourself system

    Perfect SealOnce Tool Kit

  • Wire drill attachment to strip paint from concrete

    SealOnce Roto-Stripper Drill Attachment for Paint Removal


How SealOnce Basement System Compares

15 Reasons SealOnce is Trusted by 10,000+ Homeowners Nationwide


✔  50+ years of proven performance in thousands of homes across the USA.

✔ Ideal for basements that leak water through the joint where the floor and walls meet.

✔  Easy to install. We’ll walk you through step-by-step on how to waterproof your basement.

✔  SealOnce Adhesive is our specially-formulated waterproofing adhesive that bonds water-tight in wet or dry conditions.

✔ Our SealOnce Adhesive has no solvents or smell, which makes it a safe choice went working in a basement.

✔  Back by 300+ customer testimonials with an average rating of 4.5 stars. Read all our reviews here…

✔ High quality materials made of recycled PVC.

✔ Product is proudly made in the USA, specifically in Minnesota.

✔ Back with knowledgeable and free support from our team of experts available 5 days a weeks. Just give us a call!

✔ Fast (and free) shipping direct from our warehouse in Hudson, Wisconsin.

✔ Saved homeowner’s thousands of dollars compared to busting up their floor and having a subfloor system installed.

✔ Minimal prep work compared to waterproofing paint (which is only temporary fix too).

✔ Ability to drain the system to a sump pump system or existing floor drain.

✔ Top of the system is not adhered to the wall allowing the channel to collect any seepage from the face of the wall.

✔ Once installed per our instructions, system will last for several decades.

“Best product I found in market . That’s easy to installation and working great. It’s solve my water leakage problem.”

Harry P.

“Great product that is easy to install. High quality materials make the project a neat installation. It’s nice to have a dry basement and no more water cleanup.”

Joseph I.

All I can say is, “WOW!” This surpassed what I expected. I have an older home with an extremely leaky basement. I have clay soil, so digging out around the foundation was cost prohibitive. I thought I’d give this a shot. It was so easy to install. You don’t need to be an expert with tools. This is easy even for a non-handyman. Quality product made here in the USA. I highly recommend SealOnce!!! YAY! My basement is bone dry!!!

Laura W.


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.

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

(651) 644-2000


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