Part of the Intelligent Insulation group

Wood Joist Floor

Installation Suggestions for Acoustiblok on Wood Joist Floors

Material Checklist

✓ RD350 Acoustiblok roll dispenser (ball bearing rollers allow for easy roll out and height adjustment. Recommended for use with Acoustiblok 60′ and 350’ Master size rolls.
✓ Screw gun with a magnetic tip
✓ Yellow Grease Pencil
✓ Box knives & Straight Edge
✓ Acoustigrip™ Tape (60m per roll). Requires approximately 1 roll of tape per 18m roll of Acoustiblok.
✓ Acoustiblok Acoustical Sound Sealant (310ml tubes). Installation requires approximately 2 tubes per 18m roll of Acoustiblok.

See our Accessories section for more details. (Please ask for more information if needed).

Installation Method Suggestions

  • This installation overview provides suggestions for handling and installing Acoustiblok® Sound Isolation Material. Acoustiblok is a heavy, high-density product (1lb/Ft2), so when preparing for the installation, always schedule at least two installers for efficiency and safety.
  • All tools (except, common hand tools) and materials required for a professional Acoustiblok sound installation are available from Acoustiblok UK. See our Accessories section for more details. Use the Acoustiblok RD350 Material Roll Dispenser or similar “A-Frame” type roller stand for safety and ease of handling.
  • Acoustiblok Sound Isolation Material should always, if possible, be installed on the same side of the assembly as the source of sound or noise. This will decrease the amount of acoustical energy that may be converted into mechanical noise.
  • It is essential that the treated room be sealed as airtight as possible using Acoustiblok Acoustical Sound Sealant, Acoustigrip Tape, and Acoustiputty sealant pads. The effectiveness of your Acoustiblok sound treatment will be jeopardized if these steps are not taken.
  • Always install the Acoustiblok Sound Isolation Material with the logo and U.L. printing visible. This allows for quick inspection and sign off from building inspectors and assurance to your clients that they have received a genuine Acoustiblok sound reduction treatment, not an inferior, non U.L. rated and acoustically untested product substitution.
  • For all floor installations it is important to maintain isolation of the underlayments and floor finish with all adjacent surfaces. Always leave a 1/8”-3/8” perimeter gap between the Acoustiwool, Acoustiblok, substrates and flooring from all adjacent wall surfaces. Fill these gaps with Acoustiblok Acoustical Sound Sealant.
  • Verify that the underlayments and substrates provide the structural requirements of the finished floor.
  • Confirm the compatibility of any adhesives, thinset or other products used with the Acoustiblok products.

Wood Joist Floor Installation

  • Before starting the installation, ascertain which way the Acoustiblok 3mm material needs to run i.e.: either length or width ways of the area to be installed, and cut runs of material accordingly.
  • Acoustiblok is most effective when it can be applied over the top of the joists before the subfloor is installed, (for additional reduction, apply on the bottom of the truss as well).
  • Ensure the first run of Acoustiblok 3mm material is laid square to the starting wall, (remember logo facing upwards), so that the installation will follow this line. Spot glue in place if necessary.
  • Use 171 Fast Cure Mastic and run an approximate 4” – 6” bead along each joist. Lay the material over the joists securing one end with a minimal number of staples or tape. It need not be tight. Do not worry that it will sag slightly, secure at the other end. Do not overlap the Acoustiblok, move on to the next run.
  • Continue laying each run of Acoustiblok in the same way until the area to be treated has been completely covered.
  • Wipe clean and seal the seams between runs of Acoustiblok with Acoustigrip tape and check to ensure there are no gaps or holes left in the installation area.
  • Use 171 Fast Cure Mastic to glue the sub floor to Acoustiblok. If you use nails, use the absolute minimum number required, as nails will act as microphones and mechanically pass sound into the joists.
  • If the installation allows, leave a space between the subfloor and adjacent walls 3.5mm to 9.5mm) and fill this gap with Acoustiblok Acoustical Sound Sealant. This de-coupling does make a difference. Not doing this allows sound from the floor to travel into the wall structure and down into the other rooms.
  • Pay particular attention to the perimeter edge of the room to ensure a flat and even finish. If the Acoustiblok is not lying flat to the floor, allow it to sit overnight at ambient room temperature to allow settlement.
  • In between each joist one 3.5mm clear hole should be drilled in the Acoustiblok to act as a water warning should the floor be flooded at some future date.


For any further advice on the specification, material or installation, please call our technical team at Acoustiblok UK Ltd on 01622 840289 who will endeavour to give you comprehensive and practical advice to meet your requirements.

Please note: These are suggestions only, derived from years of past usage and test results. They are not warranted or guaranteed in any way, neither written nor verbally.