Leech F-26® Construction Adhesive

Premium Quality & Waterproof

The Amazing F-26® Premium Quality Waterproof Construction Adhesive Developed by Leech Products in 1930

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F-26® Adhesive gives you the Adhesive Advantage for all projects!

Our family-owned company has perfected “The Number One Choice” in adhesives for professionals and homeowners who demand unmatched strength and versatility in their adhesives. Our F-26® industrial strength adhesive was the first to surpass the rigorous American Plywood Association AFG-01 standards, setting the benchmark for in-field gluing of plywood to wood flooring joists.

Engineered as a high strength construction glue, this adhesive delivers superior results on even the toughest jobs. Whether you’re working with wood and metal adhesive applications or projects requiring a solvent based glue that stands up to extreme conditions, F-26® provides exceptional durability and performance.

With exceptional durability and superior performance in the harshest conditions, this specific adhesive glue is the choice for those who require long-lasting, heavy-duty bonding solutions. Put it to the test and see why industry experts continue to “Stick with Leech.”

The Amazing F-26® Premium Quality Waterproof Construction Adhesive

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F-26® Construction Adhesive Available Sizes:

1.25 fl. oz. carded tube: F26-32
10 fl. oz. cartridge: F26-33-12
28 fl. oz. cartridge: F26-34

F-26® Applications & Uses:

Structural Flooring & Subfloors

This formula set the benchmark for in-field gluing of plywood to wood joists.

Silence Squeaks: By creating a permanent but flexible bond, it prevents the movement between wood and fasteners that causes floor noise.
Gap Filling: It bridges voids and irregularities in lumber, ensuring a solid, level walking surface.

Masonry & Exterior Hardscaping

Because it is fully waterproof and withstands temperature extremes, it is ideal for demanding outdoor environments.

Landscaping: Securely bonds loose bricks, stone pavers, and simulated brick facades.
Concrete Work: Used in “tilt-up” construction to attach reveal strips and for bonding decorative rock or pavers to concrete bases.
Climate Resistance: The bond is unaffected by high humidity or freezing cycles, making it a go-to for retaining walls and outdoor stairs.

Framing & Interior Systems

The high shear strength makes it a versatile choice for structural wall assemblies.

Metal Studs: Provides a heavy-duty bond for attaching wallboard or metal moldings to steel framing.
Paneling: Ideal for installing plywood, particle board, and fiberboard with minimal mechanical fasteners.
Treated Lumber: Formulated to adhere specifically to the chemicals found in pressure-treated deck materials.

Finish Trim & Specialty Fixtures

Its “fast-hold” characteristics allow for quick installation of vertical and high-traffic elements.

Entryways: Permanently secures door saddles, thresholds, and stair treads.
Hardware: Used to mount electrical outlet boxes, shelving brackets, nameplates, and signage.
Flexible Bonding: Because the adhesive stays flexible as it ages, it is perfect for bonding materials subject to vibration, such as metal brackets on garage doors.

Material Compatibility

Recommended For: Wood, metal, fiberglass, brick, tile, concrete, and outdoor carpeting.

F-26® Product Characteristics:

Shear strengths in lab & field have shown that F-26® glue is the most powerful & longest lasting premium quality construction adhesive
After applying product to one surface, join the two materials to be bonded, pull apart for 15-40 seconds, then re-join. Parts are held in place with only momentary pressure and have fast hold. Majority of bond is achieved after 24 hours, but will continue to strengthen for up to a week
After cure bond will stay flexible & strengthen with age
Bond not affected by vibration or flexing
Fills gaps to bridge voids & irregularities
Smears will not bleed through paint
Storage capacity over 12 months
Exceeds standards AFG-01, ASTM-C-557-73, FHA/HUD #60

Environmental Tolerance:

Bonds even when items are wet and/or frozen
Withstands climate extremes. Product can be used from 0⁰-120⁰F (-18⁰- 49⁰C). Finished product service temperature from -20⁰-150⁰F
Not affected by humidity

Frequently Asked Questions - F-26® Construction Adhesive

What is Leech F-26® Construction Adhesive used for?

Leech F-26® is a multi-purpose construction adhesive ideal for subfloors, paneling, treated lumber, stone, ceramics, and other porous materials. It’s designed to deliver strong initial tack and long-term hold in a wide range of applications.

Is Leech F-26® Construction Adhesive waterproof?

Yes, F-26® is highly water-resistant, making it suitable for both indoor and outdoor use—even in demanding or moisture-prone environments.

How long does Leech F-26® take to dry?

F-26® begins developing strength in as little as 18 hours, with maximum bond strength reached after about 56 days. For best results, follow all application and curing instructions on the packaging.

Can F-26® be used in cold or hot temperatures?

Yes, F-26® can be applied in temperatures from 0°F to 120°F and performs in service conditions from -20°F to 140°F, making it reliable across a wide range of climates.

Is F-26® VOC compliant in all states?

Leech F-26® Construction Adhesive contains VOCs that may exceed environmental limits in certain states or counties. Always check local regulations or contact Leech for VOC compliance guidance before use.

Why Stick with Leech

“We used your F-26® for a waterproof construction project. We have seen zero moisture penetration in any of the areas that have always been problematic. What a great product both from a constructability perspective and performance. If people are serious about building with quality products that get a true return on their construction investment, they need to use F-26® as their construction adhesive. Thanks for continuing the Leech Tradition of Excellence in your products.”
Scott A. WestDirector of Business Development

“Our lumber company has been a customer of Leech products for 40 plus years. I personally have been purchasing these products for 35 years. The products that we buy from them are top of the line and we have never had an issue with anything. If we do have questions on the products you can call them and talk directly to a person to get an answer. One of the few companies that has maintained quality employees and a quality product through the years.”
Bryan JonesHardware Manager
Builders Supply Company

“There are many choices for construction adhesive, but there’s really only one if you want the job done right.”
Woody HasleyHasley Construction

“There’s no competition when it comes to F-26, it’s the best stuff on the market. I use it on everything.”
Marty WeathersWeathers Construction

“You cannot compare other construction adhesives to F-26. It wouldn’t be fair, there’s simply nothing in its class.”
Brad Cunningham, General ManagerArkansas Wholesale Lumber LLC
The Ridout Lumber Companies

“Having been a general contractor for over 45 years with 100 million completed commercial and residential projects, I would like to comment on and recommend Leech Products. I use their Wood Filler for oak flooring and cabinet repair. It is the only product that is sustainable and permanent. Great results! No cracking and with care a perfect repair. Also I like F-26 adhesive. No reported failures in 20 years! Thanks for these exceptional products!”
R.D. BatesGeneral Contractor, LLC

“I have used multiple cases of F-26 Construction Adhesive on projects that glue wood studs to brick walls and sheet rock to studs. I’ve tried other products and they take several days to set up and then still seem soft. I will continue to purchase F-26 only for my projects.””
Jason HardinHutchinson, KS

“In 2001, before a distributor show, I played a round of golf with our rep agency. While playing, the head of my sand wedge flew off the shaft 20 yards in front of me. The next day I was telling the sales manager of Leech Products that I needed to buy a new sand wedge because of what happened the day before. He said that I wouldn't need to buy one because all I have to do is put some F-26 in the head of the club, slide it on the shaft and wait overnight. I did exactly what he suggested and totally forgot about it until the next time I played golf. Before I played I warmed up with the sand wedge remembering that I had fixed it with F-26. Just to be sure I tried knocking the head into the ground to see if it would come off. It didn't budge, and over 15 years later I still use that same sand wedge. F-26 is an truly an amazing product.”
Greg BradleyIntegrity Sales Group, Inc.

Trusted Quality Since 1930: The Leech Adhesives Story

For nearly 100 years, Leech Adhesives has been a pioneer in the adhesive industry. G.C. Hilton founded the company with a simple mission—crafting reliable adhesives for small businesses across the Midwest. Today, under the leadership of the Barker Family, Leech Adhesives remains committed to innovation, producing high-performance outdoor construction adhesives that contractors and DIYers nationwide rely on. Proudly made in the USA, our products continue to set the standard for durability and strength