Fixing timber to a concrete floor with the wrong product wastes a day's work. The right wood to concrete adhesive is the difference between a durable bond that holds for years and one that lifts as soon as the slab takes on moisture.

This guide covers the five glues and adhesives that work for bonding wood to concrete, when to use each, and how to prep both surfaces for your own projects.

Why bonding wood to a concrete floor is harder than it looks

Wood and concrete are very different substrates. Concrete is dense and porous. Timber is fibrous and moves with humidity.

Your adhesive has to grip both surfaces and stay flexible enough to absorb the difference. Most failures trace back to three issues.

• Surface dust and laitance blocking adhesion to the concrete
• Moisture moving through the slab on ground floors or outdoor decks
• Seasonal expansion in the timber pulling the bond line apart

Outdoor work and damp areas, including ground floors without a membrane, need a moisture-resistant adhesive that cures regardless of humidity.

Choosing wood to concrete adhesive products

The substrate condition matters most. Brush off loose dust, vacuum, then wipe the slab clean before any glue goes down.

If the slab carries paint, sealer or curing compound, grind back to sound substrate. Remove any old adhesive fully, since fresh product will not bond over a failed line.

Application matters next. A skirting carries no load, while a decking batten carries significant weight, so higher loads need an adhesive with proven shear strength.

Cure time matters too. Most products need at least 24 hours before any load, and longer in cold weather. Check the datasheet for your specific cartridge.

5 wood to concrete adhesive types ranked by strength and use

1. MS polymer hybrid adhesive sealants

MS polymer is the modern default for bonding common construction materials, including timber, concrete, masonry and metal. It grips porous and non-porous substrates without primer, stays flexible to handle wood movement, and cures with atmospheric moisture.

Apply through a caulk gun in a zig-zag bead, press the timber on, lift briefly, then press back to wet both surfaces. Use it for battens, skirtings and any joint where flex helps. Browse the MS polymer options in the STICK2 adhesives range.

2. Polyurethane construction adhesives

Single-component PU construction adhesives are the trade workhorse for bonding wood to concrete, cement and masonry. They cure through moisture, expand slightly to fill small gaps, and offer strong shear and tensile performance once the adhesive cures.

They suit decking battens, plywood subfloor and noggins onto block walls. Mist a very dry slab before application to trigger cure, and clamp the timber so the foaming action does not lift it.

3. Two-part epoxy resin

Two-part epoxy gives the highest raw bond strength of any wood to concrete adhesive. It cures regardless of moisture, sets as a rigid bond, and withstands chemicals and water once hardened.

The trade-off is cost and a hard bond line that does not absorb timber movement. Use it for structural fixings, heavy posts onto cement bases, and repairs where strength outranks flex. Only mix what you can apply within the pot life.

4. Expanding PU foam adhesives

Expanding polyurethane foam sits between a sealant and a cartridge glue. It expands on contact with moisture and grips porous substrates including concrete, masonry, block and most timbers.

It works well for bonding insulation-backed boards. Apply in beads, not a full coat, so the foam has room to expand without lifting the panel. The expanding PU foams collection carries gun-grade options.

5. Solvent-based grab adhesives

Solvent-based grab adhesives in 310 ml cartridges give instant initial grab on dust-free concrete and need no tools beyond a caulk gun. Keep them for lightweight indoor jobs such as skirting, dado rails and decorative trims.

Avoid them for any load-bearing or outdoor application, since cure depends on solvent flash-off and slows badly in cold or damp conditions.

How to glue wood to concrete properly

The basic method is the same across most products. Clean and dry the concrete, lightly sand the timber bond face to give the adhesive a key, then run a continuous bead or zig-zag pattern.

For wider boards, multiple parallel beads work better than one fat bead. Press the timber firmly and adjust position before the adhesive skins. Clamp, weight or prop the timber so it cannot move while the bond develops.

Leave the bond undisturbed for at least 24 hours before any load. For wooden floors and hardwood flooring on a concrete subfloor, fully coat the back with a notched trowel of suitable flooring adhesive rather than a bead pattern, since full coverage gives the durability a floor needs underfoot.

When to add mechanical fixings

Adhesive alone is not always the right adhesive choice. For structural timber, heavy decking posts or anything safety-critical, pair the adhesive with concrete screws, frame anchors or resin anchors.

The bond seals the joint and damps vibration while the fixing carries the load. The STICK2 screws, nails and fixings range carries options for use with construction adhesive.

Common mistakes that ruin the bond

Most failed bonds trace back to a small list of errors:

• Skipping dust and laitance removal
• Bonding to damp concrete with a non-moisture-resistant adhesive
• Using too thin a bead to bridge the surface profile
• Loading the timber before the adhesive reaches handling strength
• Choosing an indoor grab adhesive for an outdoor job

Choosing the right wood to concrete adhesive for your job

• Most indoor and outdoor jobs with some movement: MS polymer hybrid adhesive
• Decking, subfloor and battens onto concrete: polyurethane construction adhesive
• Structural or heavy-load joints: two-part epoxy resin
• Insulation-backed boards with gaps: expanding PU foam adhesive
• Lightweight indoor trims and skirting: solvent-based grab adhesive

For more on bonding to building substrates, see the tapes, adhesives and sealants collection, or contact the STICK2 team for advice on a specific job.

Find the right wood to concrete adhesive for your project below.