Installation Instructions

For Floated Engineered Hardwood or Laminate Flooring over Redupax Underlayment

Prep Work

1.) Inspect concrete sub floor for any open cracks and fill with high-grade epoxy filler. Remove any excess concrete lumps or residue that may interfere with the installation of the underlayment.

Wood Floor
Sub floor should be properly sloped, structurally sound, level, and clean. Good grade plywood that does not exceed deflection of L/360 of span including live and dead loads should be used.

The Redupax® sound reducing underlayment consists of soft impact absorbing boards. Small irregularities in the sub floor (up to 2mm), are leveled out perfectly by Redupax®.


2.) Redupax® underlayment and the hardwood flooring must acclimatize in their sealed packaging, in the room where they are installed for at least 3 to 5 days prior to installation. The temperature must be at least 65˚ F. Before starting your installation of Redupax® make sure the sub floor is permanently dry, and clean, (no dust).

Required Material Needed for installation
• 4 mil poly plastic sheet (vapor barrier)*
• Perimeter isolation foam *

Optional Material Needed for Installation
• Acoustical Sealant *
• Aluminum Tape*
• Adhesive Spray (3m 77 spray)
• Double side tape (to hold poly to floor)
*Material available from Sound Seal please call 800-569-1294

6 mil poly plastic sheeting is required over a sub-floor heating system

Tools needed for installation
• Utility Knife  

 Installation Instructions
 
 1.) Install 4 mil poly sheeting (vapor barrier) over all areas where Redupax® is going to be installed. Use double side tape to attach poly sheeting to the edges of walls. Overlap poly sheet joints at least 8 inches. These overlaps must be sealed over their total length with aluminum waterproof foil tape (which has a rubber glue layer). Installation of Redupax® over a sub-floor heating system requires a 6 mil poly sheeting.
 
 2.) Install the 3/8” thick perimeter isolation foam vertically around the perimeter of the entire floor, piping, and all other obstacles. The perimeter isolation barrier must be installed prior to the Redupax® installation
 
 Use Adhesive Spray to attach foam to wall. Never mechanically fasten the barrier with screws, nails or staples as this will severely diminish the acoustical value of the entire sound rated floor system.

3.) Determine the installation direction of the finished flooring as
 Redupax® has to be installed at a 90 degree angle to the finished floor.
 
 4.) Install Redupax® tiles in a brick fashion with the VVP layer (text) up, making sure the Redupax tiles are butted closely together. Do not install more Redupax® sheets than can be covered by the laminate floor in one day.
 
 5.) The laminate flooring is to float on top of the Redupax® underlayment.
 
 6.) Trim back the perimeter isolator to the height of the finished floor using an utility knife. Install base boards slightly  off the finished hardwood floor to prevent flanking paths. Caulk gap using Sound Seal acoustic caulk.
 
 Note:
 Failure to follow installation instruction could result in voided warranty

 



Redupax Floor Underlayment for floated installation require use of a vapor barrier and perimeter isolation.  4 mil poly sheeting is recommended.  3/8" thick perimeter gap is required for wood expansion and sound isolation.  You can use pieces of scrap Redupax as spacers or install the perimeter isolation foam to wall. Note must remove scarp Redupax after floor is installed

Accessories Needed for Installation


4 Mil Poly | Perimeter Isolation foam

Optional Accessories for Installation


Acoustical Caulk |  Poly seam tape