Groundworks Jumbo Underlayment - 1.4 mm Roll - 450 sf

450 sq ft roll (3 feet x 75 feet)

450 sq ft roll of 1.4 mm underlayment for use under COREtec, flooring. 

Underlayments are a great option for reducing sound and adding comfort under luxury vinyl floors. This underlayment offers a combination of benefits:

  • Loose-lay and float LVT/LVP
  • Excellent sound absorption
  • Made of 100% polyurethane foam 
  • Extends COREtec residential wear warranty 5 years
  • Moisture Retarder film
  • Smooths out minor subfloor irregularities up to 1/32"
  • Suitable for use with radiant heat flooring
  • 3' x 33.34' / 450 sf per roll
  • 1.4 mm thick

GroundWorks is a Impact Sound Reduction Underlayment that was engineered to reduce sound transmission between floors within multi-level structures. It is ideal for use with luxury vinyl tile and plank.


  • Excellent sound suppression between floors

  • No risk of plasticizer migration with recommended COREtec adhesives

  • Suitable over concrete, wood and hydronic radiant heated floors

  • Recommended for floating or double-glue installation

  • GREENGUARD GOLD Indoor Air Quality Certified®


  • Hotel Rooms
  • Independent Senior Living Rooms
  • Multi-Family Apartments
  • Military Housing
  • Areas where you are concerned about IIC ratings


This product is not approved for wide open areas, or areas where there are heavy rolling loads such as hospital beds.


construction:           Rolled polyurethane foam
application:              LVT/P and floating floors
installation:              Single glue (floating) or double glue
warranty:                  Commercial Limited Warranty                                                                                                   

  US Units  Metric
roll size: 6 feet x 75 feet 1.83 x 22.9 m
thickness:  0.055 inches 1.4 mm
roll weight: 14 / 63 lb. 6.35 / 28.58 kg

Specifications and Installation Instructions for Groundworks Underlayment

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