DIY Before the Holidays
DIY Before the Holidays

Mapei Ultrabond 905


Ultrabond 905 is a fast-curing, 100%-solids, moisture-cured urethane gun-grade adhesive designed for basic wood subfloor construction practices as well as wood-flooring repair, wood stair nosings, wood molding, baseboards, and tack strip attachment to concrete subfloors. Ultrabond 905 is also a general-purpose construction adhesive suitable for use in both interior and exterior applications. Ultrabond 905 exceeds all requirements of AFG-01 and ASTM D3498-03 for bonding plywood to lumber framing.


• Guns easily and is nonsag

• Low VOC content and 100%-solids formulation

• Fast-curing for overnight repairs

• High bond strength

• Moisture-resistant

• Suitable for use for interior and exterior application


Exceeds AFG-01 and ASTM D3498-03 requirements for field bonding plywood to lumber framing for floor systems

LEED Points Contribution

LEED Points

MR MR Credit 5, Regional Materials*

Up to 2 points

IEQ Credit 4.1, Low-Emitting Materials - Adhesives & Sealants

1 point

* Using this product may help contribute to LEED certification of projects in the categories shown above. Points are awarded based on contributions of all project materials.


• For the bonding of most common construction materials such as plywood to lumber framing, wood flooring, wood moldings and baseboards, carpet tack strip, polystyrene insulation board fascia installation and insulation board

• Interior/exterior residential (rental apartments, condominiums, homes)

• Interior/exterior commercial (office buildings, hotel rooms and hallways, restaurant dining areas)

• Interior/exterior heavy commercial (hotel lobbies, convention centers, airports, department stores)

• Interior/exterior institutional (hospitals, schools, universities, libraries, government buildings)


• Do not install over any substrates containing asbestos.

• Do not apply over any adhesive residues including cutback adhesive.

• Use only when the substrate temperature is between 20F and 100F (-7C and 38C). Low temperatures and humidity will extend cure times.

• Do not use as a substitute for screws when installing plywood subfloors. All plywood subfloors must be installed according to APA or CANPLY guidelines.


• Exterior-grade plywood and other approved wood underlayments (per flooring manufacturer recommendations)

• Concrete and properly prepared cement terrazzo

• Existing and properly prepared ceramic tile

• Cement-based self-leveling underlayments and patching compounds

• Properly prepared and primed gypsum underlayments that meet the requirements for compressive strength according to ASTM F2419

• Radiant-heat systems that have been properly installed

Consult MAPEI's Technical Services Department for installation recommendations regarding substrates and conditions not listed.

Product Performance Properties

Laboratory Tests


Polymer type


Percent solids

100 %


20 g/L






11.5 lbs. per U.S. gal. (1,38 g per mL)


Smooth paste


Dark brown

Shelf life

1 year when stored in original packaging at 73F (23C)

Storage conditions

50F to 90F (10C to 32C)

Flash point (Tag)

>200F (93C)

Application Table

Application Characteristics over Porous and Nonporous Substrates

Flash Time*

Working Time**

At 73F (23C) and 50% humidity

Not required

30 to 45 minutes

* Flash time: Amount of time recommended for the adhesive to remain exposed to the air following application before the installation of floor covering.

** Working time: The maximum amount of time an adhesive can remain exposed to the air and still effectively bond to the floor covering.

Note: Working time will vary based on temperature, humidity substrate porosity and jobsite conditions.


Product Code



Cartridge: 11 U.S. oz. (325 mL)


Cartridge: 29 U.S. oz. (858 mL)

Protect containers from freezing in transit and storage. If frozen, material should not be stirred until it has completely thawed. Provide for heated storage on site and deliver all materials at least 24 hours before work begins.


• All substrates must be structurally sound, dry, solid, and stable.

• Substrate should be clean and free of dust, dirt, oil, grease, curing agents, concrete sealers, loosely bonded toppings, loose particles, old adhesive residues, and any other substance or condition that may prevent or reduce adhesion.

• Concrete and cement-based underlayments and patches must be fully cured and free of any hydrostatic and/or moisture problems.

• Refer to MAPEI's Surface Preparation Requirements document for floor-covering installation systems at .


Note: Wear all appropriate personal safety equipment during use. Refer to Material Safety Data Sheet (MSDS) for more information.

• Ready to use; no mixing necessary


1. Read all installation instructions thoroughly before installation.

2. Insert cartridge into a suitable caulking gun.

3. Cut tip and puncture inner seal.

4. Apply a serpentine bead of adhesive to the properly prepared substrate.

5. Only apply as much adhesive as can be installed within 30 minutes under normal temperature and humidity conditions.

6. Set time may be accelerated by a light misting of water over the extruded adhesive before installing materials to be bonded. (Do not puddle water.)


• Immediately clean any adhesive smudges from the flooring material's surface with Ultrabond Urethane Cleaner while the adhesive is still fresh/wet.

• Immediately clean tools with Ultrabond Urethane Cleaner while the adhesive is still fresh/wet.

Note: Ultrabond 905 can only be removed by mechanical means when cured.


• Protect from light traffic for at least 12 hours. Protect from heavy traffic for at least 24 hours.

• Building owners should be advised of the wood flooring manufacturer's guidelines for climate control settings (temperature and humidity). These conditions must be monitored and kept constant in order to ensure the overall performance and long-term success of the installation.


Reference Guide: Surface Preparation Requirements for floor-covering installation systems


* At

Refer to MAPEI's MSDS for specific data related to VOCs, health and safety, and handling of product.


Before using, user shall determine the suitability of the product for its intended use and user alone assumes all risks and liability whatsoever in connection therewith. ANY CLAIM SHALL BE DEEMED WAIVED UNLESS MADE IN WRITING TO US WITHIN FIFTEEN (15) DAYS FROM DATE IT WAS, OR REASONABLY SHOULD HAVE BEEN, DISCOVERED .

We proudly support the following industry organizations:

MAPEI Headquarters of the Americas

1144 East Newport Center Drive
Deerfield Beach, Florida 33442
Phone: 1-888-US-MAPEI (1-888-876-2734)

Technical Services
1-800-992-6273 (U.S. and Puerto Rico)
1-800-361-9309 (Canada)

Customer Service
1-800-42-MAPEI (1-800-426-2734)

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