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Home>Crawl Space Tapes
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Foundation Seal Tape™ for Crawl Spaces- Made in the USA!

Part Number FST-100
review 60 Review(s)
Foundation Seal Tape™ for Crawl Spaces- Made in the USA!
10 Times Stickier than ALL other 2 sided tapes
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1.5" x 100'
Has reinforcement inside to eliminate stretching
This is the original Foundation Seal Tape and the only one installed by our professionals
This tape saves HOURS of labor
Surface must be dry and lightly swept for adhesion

Foundation Seal Tape (FST) is used to seal the vapor barrier to the foundation wall. When installed to a completely dry, clean (the concrete must be brushed off to remove loose debris- DO NOT USE A WIRE BRUSH- if the foundation is damp it will not stick well) foundation wall the bond is good enough to hold the vapor barrier to the wall temporarily (several hours/days) until the Foundation Pins are installed. If the foundation wall is wet in the area it will be installed and it will not bond then a polyurethane caulk must be used. This tape is 1.5" x 108' and has a reinforcement inside the tape to eliminate stretching like bubble gum. This is important because without the reinforcement this tape is impossible to apply in a crawl space. Most all other tapes on the market, similar to this one, do not have the reinforcement. 

Using a wire brush will create dust and debris that fills the pores of the block. When this happens the FST loses most of its grip to the block due to adhering to the dust in the pores rather than the block itself. No matter how much soft brushing you do AFTER the wire brush the FST will likely not stick. 

**During cold month installations this product must be stored indoors prior to use. This product is not meant for installations that have WET or very DAMP foundation walls please use the polyurethane caulk.

* Product Update- As of March 21, 2012 we have made several performance improvements to our Foundation Seal Tape™. 

First- We improved the formula in making our FST™, it now has 10x's the bonding power of our original FST™. Our original formula did a great job, but our new formula shows our continued efforts in research and our commitment to lead this industry by developing the most advanced products available.
Second- We improved the FST™ to adhere better to damp surfaces. Tests have shown the new formula can adhere to a "damp" surface, which is a major improvement. Since there are varying degrees of "damp" your results may vary. 
Third- We made the rolls lighter. When we increased the adhesion strength we were able to lighten the roll's weight and use less material. It created a balance between better performance and no increase in cost.
Fourth- We made it longer. Because we could make the rolls lighter it gave us the option to add some length to the roll, therefore making an even better value. The new roll size is 1.5" x 108' instead of 100' in the old formula.
Fifth- We work vary hard to make all of our products in the U.S. or Canada when possible. With some products it simply isn't, however the new FST™is now made in America. Investing in OUR country is as important to us as it is to you.

The new FST™ is in stock and ships immediately. 

**We always recommend getting a few tubes of Poly Caulk to make sure you have enough material to get a good seal to the foundation and to handle any damp areas on the foundation walls. Remember when you figure your FST to include going under beam pockets, ductwork that is touching the foundation walls and the access door. -\
6 rolls to a case.

Rating Homeowner
This tape was absolutely wonderful! It is very sticky and saved so much hassle for me doing this by myself! Great product!!!
  Reviewed by:   from Basement. on 11/3/2018
Rating Homeowner
This tape worked awesome and adhered to the masonry blocks nicely. Very sicky! This is a must have if you are placing the plastic by yourself. I was able to put one end of the vapor barrier up and the tape held it in place, then crawled to the other side of the crawlspace, pulled the remaining plastic into place and adhered it to wall flush. It held tight until I was able to secure with permanent pins.
  Reviewed by:   from Hendersonville. on 7/11/2017
Rating Mr.
Sticks well to concrete and poly sheeting.
  Reviewed by:   from WY. on 5/11/2017
Rating home owner
Save your money on this one. Unless your walls are really dry, this tape will not hold itself up much less the vapor barrier.
  Reviewed by:   from Frankfort Kentucky. on 3/31/2017
Rating Our vented crawl space in North Carolina
We are completely satisfied with both the products and the service!!
  Reviewed by:   from North Carolina. on 2/8/2017
Rating Home owner
Excellent quality and functionality. Competitively priced as well. However I asked it be shipped US Postal Svc but it came UPS at a stiff rate. Apply this 2 sided tape by hand sticking it without stretching it. Leave the outer backing paper on, then use a hand roller (J bar roller) to firmly press the tape onto the foundation. Roll the tape with the paper backing with hard pressure.. Then peel off the outer paper and place the vinyl fabric onto the exposed tape. Again use the J roller. Firmly roll the vinyl over the tape. Using the roller firmly and twice is a best-practice method. This tape will please you. Cut this tape with a knife. It quickly gums up scissors. Don't let the knife point puncture the vinyl.
  Reviewed by:   from Anacortes WA. on 6/1/2016
Rating Owner
This tape works really well when installing an attic tent. It holds the tent in place until I can staple it to the framing. It also air seals the opening as well. Longer than necessary for 1 tent, but we install a couple dozen a year. It works great and no mess.
  Reviewed by:   from Charlotte. on 12/19/2015
Rating Tape
Did not find this product had very good ability to stick to cement. I followed instructions I was given and even called back when I was having an issue trying to get it to adhere to dry clean cement
  Reviewed by:   from Crawl space. on 11/12/2015
Rating Two Sticky
This tape reminds me of the type of advise used in automotive, specificly to adhere the windshield to the frame. The tape sticks well to concrete but make sure you get it right the fist time as it is hard to remove from the plastic wrap and after pealing it from the concrete it won't stick well the second time. If I could make a recomondation I would suggest a wider backer than the tape membrane to ease the removal as it it very difficult to get an edge started.
  Reviewed by:   from Ontario. on 10/24/2015
Rating Excellent experience
This was amazing tape. So far it still holds! (1 month out) Great for the application and didn't take us long to learn to handle and use it. Just a little practice.
  Reviewed by:   from West Virginia. on 9/24/2015
Rating Did not stick well to the concrete wall
I had a really difficult time getting this to stick to the concrete. I brushed and cleaned the wall prior to applying the seam tape, but it did not want to stick. I ended up stapling the vapor barrier to the sill plate until I was able to get the pins installed. So, it appears the the concrete needs to be REALLY clean for this to be effective.
  Reviewed by:   from Oregon. on 9/24/2015
Rating Quality product- but...
We found there are too many variations in our stone wall for this to work. We instead used more pins at the top and then used adhesive caulking to seal the top. We only used three feet of this and are not sure what we can use this for, now? Any chance for a return/refund? We bought two rolls of this.
  Reviewed by:   from KC. on 9/14/2015
Rating Crawl Space Project
The Foundation two-sided Seal Tape was much stronger than I expected (impressive). Sticks and holds to the foundation and vapor barrier plastic without pulling away - even if/when you accidentally pull the plastic too hard.
  Reviewed by:   from Virginia. on 9/3/2015
Rating Outstanding tape
I was surprised how well it stuck to the cinder block wall. Our crawl space was quite dusty before the liner was applied. It can be unforgiving if you need to pull the liner off the tape in order to smooth out wrinkles as you are moving along the wall. As indicated in the video only apply a small length of liner to the tape at any one time to minimize wrinkling of the liner.
  Reviewed by:   from Atlanta. on 5/15/2015
Rating homeowner
Easy to use and it works.
  Reviewed by:   from peoria,il. on 3/23/2015
Rating The too sticky tape!
I say too sticky because this stuff is really sticky. If you stick it to the wall and don't start pealing off the top layer, it's a real pain in the neck. Before you stick it to the wall, start the top layer pealing off as well, then make a 'loop' and stick it back on so it's easy to get hold of when you are ready to start hanging your wall liner. Truth be told, it's not too sticky, but when it's stuck to your fingers, you may beg to differ.
  Reviewed by:   from Elk Park, NC. on 2/15/2015
Rating Foundation Tape
This tape was amazing and was easy to apply and held the 12mm encapsulation material with no problem. I did the project when I had time in the schedule and had to leave the job with only the tape holding the barrier for two weeks before I could install the foundation pins and it continued to stick and hold without failure. Great product!
  Reviewed by:   from Asheville NC. on 1/20/2015
Rating Owner, The Clean Air Co.
This is a remarkable product. Best 2 sided tape I have ever used. You better put it in the right place the first time because once you put it on the block it it not going to come off.
  Reviewed by:   from Nashville, TN. on 1/16/2015
Rating Homeowner
I brushed the block but the tape didn't stick well in some areas. The areas that did not stick well, I used the plastic pins, with caulk and it did a nice job.
  Reviewed by:   from Andrews, SC. on 1/13/2015
Rating Fantastic tape
I cannot believe how well this tape holds. I used it to tape my vapor barrier to cement. The only warning is that it is so powerful that you don't get a second chance if you mess up. Anyway, this tape is well worth it.
  Reviewed by:   from Washington State USA. on 1/6/2015
Rating Does not stick well
I just had my basement walls parged. The stucco is clean and dry but this tape would barely stick to it. It's a waste of money. Use the foundation pins and seal with the caulk instead.
  Reviewed by:   from Asheville, NC. on 12/28/2014
Rating Home Owner
Great product, sticks well to concrete blocks, easy to apply, and along with the pins does a neat and professional job. If you have a crawl space, is the place to get the right products to do the job! Highly recommend the product and their expertise.
  Reviewed by:   from Chatham, Ontario. on 12/11/2014
Rating Homeowner
This stuff is crazy sticky! It works good. If the wall is uneven, it hard to follow the wall though
  Reviewed by:   from Michigan. on 11/26/2014
Rating Doesn't work on old blocks
The foundation blocks under my house my house are over 60 years old. Even after brushing them with the spacial brush these tape wouldn't stick. The caulk i ordered just in case did work but I will need to buy lots more.
  Reviewed by:   from brevard nc. on 11/23/2014
Rating Homeowner
The tape was a WASTE OF TIME AND MONEY. I brushed the block but the tape never stuck. Was going to use the plastic pins with the tape. Instead I used the pins with caulk and everything went great.
  Reviewed by:   from Phila.,Pa. on 11/2/2014
Rating Home owner
Tape worked great. Was easy to use . Made the job of sealing the sde walls of the foundation and the vapor barrier a breeze.
  Reviewed by:   from Buffalo ny. on 10/27/2014
Rating Warehouse/Purchasing Manager
This product has lived up to its reputation. Made the first purchase based on the reputation, and continue to purchase it based of satisfaction.
  Reviewed by:   from Bethany Beach DE. on 10/9/2014
Rating Foundation Seal Tape
This stuff is very sticky. So don't let it stick to itself. But when I installed my vapor barrier, the tape did not stay stuck to the block wall. You'll need to install Crawl Space Foundation pins as you go to keep it from falling. I will probably have use some polyurethane caulk to seal the top edge of my vapor barrier where the seal tape did not seal.
  Reviewed by:   from Camden, TN. on 7/27/2014
Rating homeowner
This product works great. Absolutely essential if you are trying to affix the 12 mil barrier to a brick foundation in a space with 16 inch clearance. You have to be a contortionist. This product was strong enough to hold the plastic in place so I could belly crawl down the line. Because I had uneven brick to work with I had to go back through and put a foundation pin every 12 inches. It would not have been possible without this great product.
  Reviewed by:   from Charlotte, NC. on 7/8/2014
Rating Great Quality Items
Found all the products I have used from Crawl Space Repair to be high in quality along with fast shipping and packing. I tackled this job by myself and was still able to accomplish a great job when finished (although a little soar in the joints)and a little more time to The foundation seal and waterproof seal tapes worked great and had a lot of holding power. I was impressed with the foundation tape as it stuck very well to the cinder blocks after lightly brushing them off. The foundation pins were easy to install and the 1/4 inch holes were surprisingly quick to drill in the cinder blocks. Makes for a neat job and extra holding power for over a longer period of time. The vapor barrier I used was the 12 mm and very strong and was amazingly easy to work with and lay down in sections,even on the walls of the crawl space. Now I have a crawl space that is well lighted and clean with less moisture content. I have even noticed some differences in the temperature of my house. It seems to stay cooler longer in the warmer temperatures,outside, we have been having,which means lower power bills. Been turning the air on in late afternoon and turning it back off in early evening and it stays a comfortable temp inside. We shall see what happens when summer temps come around,but it still should be an improvement.
  Reviewed by:   from Stokesdale N Carolina. on 6/3/2014
Rating Good quality
I used the foundation tape and it worked great! I swept the block with a broom and applied the tape. Then, I installed the pins. The job went smoothly with no issues.
  Reviewed by:   from Jax Beach. on 4/15/2014
Rating Very strong tape
Good stuff. Makes the wall and piers much faster to work with.
  Reviewed by:   from CA. on 2/26/2014
Rating Mr
Works well, not as sticky as I would like, but works if plastic is clean with no dust.
  Reviewed by:   from Columbus, Ohio. on 2/24/2014
Rating President
I wouldn't use this tape on oxidized concrete as the dust wont allow it to seal properly. I would use spray foam if I did it again
  Reviewed by:   from Nashua, NH. on 2/20/2014
Rating incapsulating the cral space
easy to use, great product
  Reviewed by:   from portland. on 1/6/2014
Rating Homeowner
I'm sealing the crawl space on a new house under construction. I applied the tape and vinyl liner to the foundation walls prior to the wood floor system being installed. I made sure there wasn't any blobs of mortar in the way of the tape. The block was dry so the tape had good bonding strength. The excellent adhesive strength of the tape allowed me to install the tape along the entire wall section (60')and then hang the vinyl prior to drilling for the pins. Two days later I noticed the tape pulling away from the block in some of the corners. Since I had ordered extra foundation pins, I went back and installed pins closer in the corners as well as in between all of the original pins. Therefore, pins are every foot along the walls. I feel confident the vinyl will not come down now.
  Reviewed by:   from Sunset Beach, NC. on 12/10/2013
Rating Foundation Seal Tape
I found in my damp crawlspace where my home is built on footings so the barrier had to be put directly on the inside of the bricks. The tape didn't stick to the moist brick. I've had to depend on the pins and caulking to seal the barrier to the interior crawlspace wall. It adhered well to the cement blocks though.
  Reviewed by:   from North Carolina. on 12/5/2013
Rating Foundation seal tape
Product sticks even to damp surfaces, easy to use
  Reviewed by:   from Crawl space foundation. on 12/1/2013
Rating home owner, do it yourself person
Great tape!! Sticks to most surface types. If you have sprayed your walls with any chemical (termite treatment, etc.) the tape will not stick. You will need to clean the surface first. And you will need to keep a clean blade at all times to cut the tape..
  Reviewed by:   from little rock AR. on 11/25/2013
Rating Worked Great
I used the Foundation Seal Tape to adhere a 10 mil vapor barrier to the bottom of the concrete foundation walls. Worked very well all by itself, no need for further anchoring since there was little pull from the plastic. Crawl space is now totally sealed
  Reviewed by:   from Colorado. on 10/23/2013
Rating Great tape
I used this tape to encapsulate the piers in my crawl space. It stuck very well to the cinder block. I used 6 Mil plastic and it adhered perfectly.
  Reviewed by:   from California, MD. on 10/14/2013
Rating Great Combo
Just wanted to send you a quick note to let you know how well the Foundation Seal Tape worked for my vapor barrier. After brushing the block and insuring they were dry, the tape stuck well and allowed me plenty of time to hang the vapor barrier and install the Foundation Pins. This barrier has been installed for a month now and I have had no problems with the seal. I would recommend the Foundation Seal Tape and Foundation Pins to anyone who is installing a crawl space vapor barrier.
  Reviewed by:   from West Virginia. on 10/4/2013
Rating The Answer to a 30 Year Problem
WOW! You guys are the greatest. I called several times with several questions before I purchased the 12 Mil GuardianLinerâ„¢. Everyone I spoke to was very knowledgeable about crawl space encapsulation. We searched the web and I found you guys. I called and if you told me once you must have told me 20 times to seal the vents. I could not believe this would work. I did it and ordered the GuardianLinerâ„¢, the Foundation Seal Tape, the Waterproof Seam Tape, the Foundation Pins and a hygrometer. I would never have believed sealing the vents and encapsulating would be the answer to a problem we have had for over 30 years. Had we know this last year or 2 years ago, we could have saved a lot of money on insulation. I will definitely recommend you and your company to everyone I see who says they have a moisture problem in their crawl space. I have another friend whose brother paid around $10,000 to have his crawl space encapsulated on the eastern shore of Maryland. We did it for a fraction of the cost. Excellent, excellent product and excellent, excellent customer service from Bob, Caitlynn, and Larry. Kudos! Thanks again, GuardianLinerâ„¢ User and Believer
  Reviewed by:   from Maryland. on 10/4/2013
Rating Happy!
I am very happy with the result since we converted a vented space that was a nightmare into one that was actually pleasant to be in. It should pay in utility bill dividends over the next few years.
  Reviewed by:   from Kentucky. on 3/20/2013
Rating Quality products!
I was very pleased with the quality of materials and the relative ease of installation. You get high marks for quality, service, and an excellent website.
  Reviewed by:   from Maryland. on 3/14/2013
Rating Great Product!
Thanks for the follow up. Your products were more than what I expected, but I can't say enough about the excellent support I received from your staff. I'm hoping to use your products on another project I may have coming up soon.
  Reviewed by:   from Pennsylvania. on 3/8/2013
Rating Foundation Seal Tape
I used Foundation Seal Tape to seal the existing vapor barrier in my crawlspace to the concrete side wall. Now I have as close as a person can get to a completely sealed crawlspace floor. In the spring and fall our water table comes up and makes the ground moist. Now I have a complete seal. Product was very easy to install. It stuck well to the concrete wall and the plastic sticks to the tape very very well. I have checked out the stickyness after one month and the tape is doing its job great. No releasing anywhere. In reality, it seems like it has a better grip now than the day I installed it. I can lightly pull on the plastic and the plastic will not come off the tape, and the tape will not come off of the concrete. So, Foundation Seal Tape works as the company says it will. I recommend this product to anyone wanting a total vapor seal in their crawlspace. MP North Idaho
  Reviewed by:   from North Idaho. on 3/3/2013
Rating An absolute must
This is probably the most useful product I used in redoing my crawlspace. It is excellent for hanging the vapor barrier on the crawlspace walls and floor piers. I have used for other applications as well. Extremely useful. The technique shown on the video for unpeeling the craft paper was great advice. Very impressive.
  Reviewed by:   from Huntsville, Alabama. on 12/21/2012
Rating Very good product
I have recently purchase a 12 mil crawlspace membrane, the foundation tape, the waterproof seam tape and the pins. I was very impress with the quality of the products, the crawlspace of my chalet is now clean and no more smelling or humidity. As an general contractor this is the kind of product we are looking for, I have decided to offer the product to my own customer, this is definitely way much better that the 6 mil polyethylene that the CNB suggest we install in crawlspace. The membrane is very resistant and will last for years to come. Thanks for an awesome price. André Allaire General Contractor Vita Project inc.
  Reviewed by:   from Montreal. on 10/30/2012
Rating worked better than expected
I was worried that it might not adhere so well because my foundation walls were not smooth but rippled in texture like Ruffles potato chips but it turned out OK and I had no problems hanging and securing the 12 mil to the walls.
  Reviewed by:   from Elk Grove Village, IL. on 10/29/2012
Rating Home Owner
Foundation seal tape works great and performs as described. I would purchase this product again in needed.
  Reviewed by:   from Oscoda, MI. on 7/9/2012
Rating Easy to use
The foundation tape made the job easier than expected.
  Reviewed by:   from Virginia. on 6/27/2012
Rating works good on foundation block but not on existing styrofoam sheeting
The tape worked well on the foundation block but when applied to existing insulation styrofoam sheeting it peeled off rather easily, but because the tape was a temporary thing, it wasn't an issue. The permanent application with the vinyl sheeting screwed to the block the tape didn't matter in the end.
  Reviewed by:   from MI. on 5/1/2012
Rating Sailor
I finished encapsulating my crawl space and the tape worked as advertised. I did find difficulty in pealing off the protective strip. I will know in about a year if the encapsulation system lives up to expectations
  Reviewed by:   from New Jersey. on 2/10/2012
Rating Good for center block, but not good on red brick
This is some really strong tape. If it touches the vapor barrier, it is easier to leave it than to pull it off. The tape works really well on clean center blocks as long as you only attach it to the block and do not pull it off. However if you have red brick, the dust in the brick covers the tape and it looses its adhesiveness. To cut, use heavy duty scissors and a razor to peal the brown paper from the tape. I used the tape and polyurethane caulk. I strongly recommend this product.
  Reviewed by:   from Peoria, IL. on 1/11/2012
Rating Great Products and Service
. All materials and supplies were as advertised. The foundation tape, the water proof seam tape, and the vapor barrier fasteners worked exactly as advertised. I could not have been more pleased with the products.
  Reviewed by:   from NC. on 1/2/2012
Rating Good seal tape
Thick and gummy, good for sealing vapor barrier to concrete block. If concrete surface is pitted or irregular, however, I would recommend using polyurethane caulk instead.
  Reviewed by:   from North Alabama. on 12/20/2011
Rating Capable homeowner
This foundation seal tape was outstanding. It sealed and held under tough conditions far better than I expected. I was most impressed with its thickness and it's holding power. I used a bit more than originally planned because I had several uneven surfaces to seal around. I used the tape to add thickness so the vapor barrier didn't have to be cut perfectly or stretched into small wall/support voids that needed to be sealed for my project.
  Reviewed by:   from Warrenton VA. on 12/7/2011
Rating Tape worked great
This tape and all other products purchased were exactly what was described and I am very happy with the entire purchase and experience.
  Reviewed by:   from VA. on 8/23/2011
Rating Saves time
This tape is easy to dispense and cut. I use a utility knife to cut and then lift the backing off of it. Be sure to clean the block where the tape will go. you do need to press it down to get a good seal and stick. I used alot more than I expected. measure the door way and any other vertical obstruction where you will have to run this tape down the vertical. I had 2x4's nailed to my block where all the electrical wires ran down. used up 25ft right there.
  Reviewed by:   from crawlspace. on 6/28/2011

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