F-26

When it comes to building or renovating homes in areas that are prone to flooding or floodplains, you may need to think about more than just using materials that can withstand a flood. Instead, you should pick materials that can withstand moisture, be fully submerged, and bounce back from fluctuating temperatures.

Using the wrong adhesives can be especially tricky, as they can literally pull the entire building down, even if the rest of it is designed to be flood-proof. And that’s exactly what can happen if you don’t get the adhesives right, meaning, you’re left with leaks, structural damage, and a hefty repair bill.

That’s where high-performance construction adhesives, like the ones from Leech Adhesives, can be a game-changer. Protecting your build from water damage is now possible thanks to them.

Leech Adhesives is a family-owned company based in the US and has been helping contractors and DIYers with construction projects since 1930.

Our heavy-duty construction glues, sealants, and caulks are designed to do the trick when it comes to dealing with flood plains and wet environments. All Leech products are built to last and can handle the wet/dry cycles and even actual flooding.

The adhesive experts at Leech Adhesives want to provide you with the insight and knowledge about the importance of selecting quality adhesive products. We’re going to look at how putting good flood-resistant building practices in place at the same time as choosing quality adhesives like Leech can make the difference when it comes to getting the job done right in a flood-prone area.

Understanding Flood Plain Construction & Flood-Resistant Materials

Why Does Flood Resistance Matter in Construction?

Homes or businesses located in flood plains (or within a zone designated by flood maps) are at elevated risk of water intrusion. Depending on the depth and duration of flooding, regular construction materials may absorb water, degrade, or harbor mold and mildew. To reduce long-term risk and facilitate easier recovery when floods occur, many building codes and flood-resilience guidelines require the use of flood damage which means resistant materials below the Base Flood Elevation (BFE). 

Flood-resistant materials are defined as those capable of withstanding direct and prolonged contact with water, such as 24 – 72 hours or more, without significant damage. Meaning that after floodwaters recede, the materials can be cleaned, sanitized, and reused, rather than needing replacement.

What is the Difference Between Dry vs. Wet Flood-Proofing?

There are two main flood-proofing approaches: dry floodproofing and wet floodproofing. 

Dry flood proofing usually involves stopping the water from getting in the first place, using barriers, sealants or elevating things like doors and windows. 

Wet flood proofing on the other hand, takes the view that the water is gonna get in, but with the right materials that can handle being wet and then drying out again, you can still build a structure that can withstand it all. These are buildings with masonry walls, concrete, or tile.

For building in a flood plain, especially if flooding is a regular deal in that area, wet flood proofing with the right adhesive materials is often the more practical, better-built choice.

The Role of Waterproof Adhesives in Flood Prone Construction

When it comes to designing flood-resistant construction, you can’t just stop at choosing the right materials, instead, you also need to think about the adhesives and sealants holding those materials together. The truth is, the adhesives and sealants used in construction can be just as important as the materials themselves when it comes to a structure’s overall resistance to water intrusion and long term wear.

Why Choosing Your Adhesives Wisely Really Matters

• If you don’t get the adhesive right, your flood defence will fail. Most standard adhesives just don’t cut it when it comes to prolonged exposure to moisture – they can lose their grip, and cause all sorts of problems like materials separating or warping. Waterproof adhesives, on the other hand, are designed to resist moisture, stay strong even when they’re submerged, and keep going even after being repeatedly wet and dry. The less said about the problems with adhesives that let the side down, the better.
• They are essential for proper wet flood-proofing. Flood-resilience guidelines (you know the ones) make it pretty clear that in order to be flood damage resistant, everything – that’s substrates, finish materials, and adhesives as well – has to be able to withstand a flood. Which is where a good waterproof adhesive really comes into its own.
• Using a good adhesive will cut down on maintenance and repair costs. When adhesives can resist moisture, the chances of anything mouldy, rotten or structurally compromised happening are a whole lot lower. And that means lower maintenance costs, lower risk of expensive repairs and safer occupants and you can’t put a price on that.

Why Leech Adhesives Products Are a Strong Fit for Flood Plain Projects

Among the many offerings on the market, Leech Adhesives stands out for several reasons:

• History and reputation. In business since 1930, Leech has long been a trusted name in professional-grade glues and adhesives for a variety of construction projects.
• Waterproof and weather-resistant formulations. Our adhesives are explicitly designed to be a strong fit against extreme weather conditions like severe cold or heat.
• Versatility across materials and jobs. Whether your project involves masonry, treated lumber, concrete, subfloors, exterior trim, or mixed-material assemblies, our Leech Adhesives work for a majority of construction projects.
• Trusted by contractors.  Our Leech flagship product, F-26® Construction Adhesive, has a strong reputation as being the one of the most long lasting, premium construction adhesive in the construction industry.

With these perks in mind, Leech Adhesives is well-suited to support floodplain construction and renovation projects where water exposure is likely or unavoidable.

Best Practices for Flood Plain Construction Projects

Here are some key steps to follow when selecting the right adhesive for a flood-prone construction project.

1. Choose the Right Materials & Adhesives Together

Selecting flood-resistant finish materials (e.g., masonry, concrete, tile, sealed concrete, vinyl flooring with chemical-set adhesives) is essential, but also ensure that the adhesives and sealants used are rated for wet environments. As noted in flood-resistant construction guidelines, adhesives and fasteners must satisfy flood-damage resistance requirements.

At Leech, our F-26 adhesive is designed for porous substrates and intended for outdoor, moisture-prone, or all-weather use.

2. Apply Adhesive Correctly

The application of adhesives is equally important. Here are some important application tips to know:

• Spread the adhesive evenly (avoiding globs or thin spots) and apply it within the recommended temperature range (for F-26: best when applied between 0°F and 120°F; once cured, it holds from –20°F to 150°F).
• When bonding substrates like masonry, concrete, treated lumber, or subfloors, ensure surfaces are clean, dry (unless product allows wet application), and properly prepared before adhesion.
• For heavy materials in construction projects, consider clamping them in place until the adhesive sets. This step ensures full contact and proper bonding strength.

3. Combine with Flood-Resistant Construction Strategy

Having an effective strategy during flood-construction projects is also important. Here are some key steps to keep in mind for successful floodplain construction.

• Use flood-resistant materials below the Base Flood Elevation (BFE).
• Where possible, use “wet flood-proofing” design — allow floodwaters to enter and exit, using materials and adhesives that can withstand moisture and enable easy cleanup and drying. 
• Use rust-resistant or non-corrosive fasteners, connectors, and any other components — because even the best adhesive can fail if adjacent parts corrode or degrade.

4. Plan for Maintenance & Cleanup After Flooding

Even with flood-resistant materials and adhesives, flooding may still cause silt, debris, or contamination. After a flood event:

• Clean and sanitize surfaces thoroughly. Flood-resistant adhesives and materials are designed to withstand such cleaning and still retain their integrity.
• Inspect bonded joints, seams, and seals — especially around windows, doors, floor-to-wall joins, and exterior trim — for signs of weakening, moisture infiltration, or damage.
• Repair or re-seal as needed using the same or equivalent flood-rated adhesives/sealants.

Let Leech Adhesives Help You in Your Next Flood Plain Construction Project

Building in areas that are prone to flooding involves more than just raising the building or sealing up doors and windows. Real flood resilience means using flood-resistant materials, smart design like wet or dry flood-proofing, and adhesives that can handle moisture, changing temperatures, and last over time.

Leech Adhesives products, especially F-26® Construction Adhesive, provide the waterproof bonding, material compatibility, and weather resistance needed for building in flood-prone areas. They work well for masonry, subfloors, exterior trim, and more.

Choosing the right adhesives, using them properly, and making them part of a bigger flood-resilient plan helps contractors and homeowners lower the risk of water damage, cut maintenance costs, and build structures that last through floods and harsh weather.

Select Leech Adhesives for your next construction project. Unsure of which Leech product is right for you or your construction project? Contact us to learn more. 

We look forward to working with you!