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Tsunami Seal

Model # 51020

Internet # 202199774

20 ft. Gray Garage Door Threshold Kit

This item has been discontinued.
The Home Depot no longer carries this specific product.

$94.95 /each




Model # 51020

Internet # 202199774

The Tsunami Seal Garage Door Threshold Seal mounts to your garage floor creating the perfect seal between your door and your garage floor. The Garage Door Threshold Seal creates a tight seal for your garage door which will keep leaves, dirt, water and snow from being blown under the garage door by the wind. Also, if you have a sloped driveway or an uneven garage floor and water is seeping under your garage door, the door seal adds a 1/2 in. tall barrier to the garage floor. The door seal will also help keep out unwanted insects and snakes. By creating a better seal, your garage will stay warmer during the winter and cooler during the summer, helping to keep your energy cost down. The door seal works great with all types of garage doors including roll up doors, hinged wood doors and walk through doors. The one piece strip is permanently secured to the garage floor with the included Liquid Nails Polyurethane Adhesive. Each kit includes the one piece Threshold Seal, two cartridges of Liquid Nails Ultra DutyTM Poly-Adhesive and a metal caulking gun and color installation instructions. Comes with a lifetime warranty.

California residents: see  Proposition 65 information

  • Creates a barrier against water, leaves, dirt and snow
  • Keeps out insects, snakes and rodents
  • Garage stays warmer during the winter and cooler during the summer
  • Helps to save energy
  • Works with roll up doors, hinged doors and walk through doors
  • Includes two cartridges of liquid nails ultra duty poly adhesive
  • Includes a metal caulking gun
  • Lifetime warranty

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Garage Door Part/Accessory Type 
Garage Door Seal 
Product Weight (lb.) 
11 lb 
Warranty / Certifications
Manufacturer Warranty 


Rated 4.4 out of 5 by 9 reviewers.
Rated 5.0 out of 5.0 by Rubber guard This was very easy to use. I left upside down unrolled overnight. I put the glue down to keep in place on a down hill drive slope, to slow sand from coming to garage. It's angled to help runoff go towards a grassy area. Working well for what I needed. Only been a month but holding in place. September 22, 2015
Rated 5.0 out of 5.0 by 20' door threshold kit This product was easy to put down and has so far stopped the flood in our garage. We ordered the 20' because our 2 garage doors were 9' 1" wide. It was a little difficult to cut the pieces, but well worth it. November 4, 2014
Rated 2.0 out of 5.0 by You cant depend on glue Good in theory, but failing after a month. One side has started to peel up after 1 month. The manufacturer would probably say that surface preparation, cleansing, or adhesive application was done incorrectly, but I would disagree. My garage floor has a "polished" cement floor. Very smooth, and not enough surface area to provide adequate grip for the adhesive. I am not suprised it is beginning to fail already. We also have our cars at full turning lock to enter and exit the garage, which is producing torquing forces on the strip. The strip will need to be achored with concrete screws or something better than glue. The door is sealed nicely though, and it keeps water out. August 21, 2013
Rated 5.0 out of 5.0 by Good product as advertised The kit arrived on time and as advertised. The instructions were clear and installation of the product itself was relatively easy. The main difficulty was removing the old adhesive from the concrete floor. Ideas on the internet were of little help. I used a combination of a battery operated multi-tool, an electric sander with very coarse sandpaper, a chisel and lots of elbow grease. I think the 2 tubes of caulk and the caulk gun were a little excessive. Most people willing to tackle this project probably own a caulk gun and I got sufficient coverage with one tube - although it was close. So far it is keeping the leaves, debris and water out of our garage. August 7, 2012
Rated 4.0 out of 5.0 by So far so good I only gave this product a 'good' rating because we just haven't had it down long enough to say excellent yet. But as I said in the title, so far so good. It was easy to put down with two people, you really couldn't do it alone. The adhesive that comes with it (liquid nails) has some flexibility in it so even after you lay the strip down you can lower your garage door and have time to snug it up under the door. It actually looks pretty good on the floor (we got grey). From what we've seen so far we would recommend it to others. September 27, 2011
Rated 5.0 out of 5.0 by Worked like a charm.. Had a problem with water that puddles right at the edge of the driveway at the corner of my garage on the outside during a heavy rain, and then running under the garage door into the garage, this fixed the issue.. I thought I was going to have to spend thousands having my driveway redone.. January 24, 2012
Rated 5.0 out of 5.0 by This product solved my problem. There were always leaves and rainwater blowing in under my garage doors. This threshold kit resolved the problem. We had 2 days of continuous rain and not a drop made its way under the door! Great product! September 18, 2011
Rated 4.0 out of 5.0 by Instructions were very clear and easy to follow. The instructions for installing the Tsunami Seal Garage Door Threshold Seal were very clear and easy to follow. The installation process took less time than I had anticipated. The seals work very well. October 16, 2011
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