GCP Applied Technologies -KOVARA® 95 Moisture Barrier Flooring Underlayment


Moisture barrier for protection of flooring assemblies up to 95% relative humidity.

Category: laminate flooring underlayments | laminated flooring underlayments | moisture barrier flooring underlayments...

MasterFormat: Common Work Results for Flooring Preparation | Moisture Vapor Emission Control | Tile-Setting Materials*...

GCP Applied Technologies
62 Whittemore Avenue
Cambridge, MA 02140
Tel: (617) 876-1400



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KOVARA® 95 Moisture Barrier Flooring Underlayment

KOVARA® 95 moisture barrier is designed to be laid down above concrete floor slabs and below floor coverings to protect these materials - as well as their adhesives - from any staining, warping or mold that may result from water vapor emissions and alkaline salts infiltrating through the concrete slab up to 95% relative humidity. KOVARA® 95 consists of a three-layer composite construction, with a HDPE bottom layer for moisture protection, glass mat middle layer for dimensional stability, and gray mineral top layer to enhance adhesive bond.

KOVARA® 95 is installed with KOVARA® 95 Seam Tape to protect the seams. When moderate or heavy rolling loads are expected, application of KOVARA® Double Sided Tape is required in a 5’ x 5’ or 2.5’ x 2.5’ box grid configuration. Refer to the KOVARA® Box Grid Application Method on gcpat.com for additional information.

Product Advantages
  • Installation in a fraction of the time of epoxy-based moisture barriers
  • Reduced labor costs and improved project capacity for contractors
  • Reduced downtime and business disruption for building owners
  • No shotblasting required
  • Resistant to heavy rolling loads
  • Does not support mold or mildew growth
  • 10-year product warranty

KOVARA® moisture barriers are backed by a limited 10-year replacement warranty. You can find the entire KOVARA® 95 warranty information at gcpat.com, or contact your GCP Applied Technologies sales representative for details.

Technical Services

KOVARA® 95 customers benefit from GCP’s Technical Service team, providing field support for successful job completion.

Product Uses

KOVARA® 95 can be used under any of these approved floor coverings:

  • Carpet tile
  • VCT-vinyl composition tile
  • SVT-solid vinyl tile
  • LVT/LVP-luxury vinyl tile/luxury vinyl plank
  • SDT-static dissipative tile
  • Laminate flooring
  • Ceramic tile
  • Porcelain tile
  • Natural stone
  • Broadloom carpet
  • Woven synthetic-backed stretch-in, double glue and direct glue carpet
  • PVC backed carpet
  • Urethane foam backed carpet
  • Compressed urethane backed carpet
  • Recycled backed carpet
  • Engineered wood-floating or direct glue
  • Bamboo

The following specialty floors require review to verify existing conditions and use to ensure the best installation; please contact your local GCP flooring sales rep or GCP Technical Services for a warranty registration form or any other questions.

  • Commercial and residential sheet vinyl flooring
  • Rubber flooring
  • Resilient sports flooring
  • Wood court flooring

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Physical Properties
PropertyTypical ValueTesting Method
Roll Size5’ x 144’ (720 sq. ft.)-
Basic Weight11.5 lbs. per 100 sq. ft.ASTM D2646
Thickness24.0 mils

ASTM D5729

Permeance<0.1 permsASTM E96
Maximum PH Allowed12-
Fungi and Mold ResistanceDoes not sustain mold growthASTM G21-15
FlammabilityPassesASTM D2859-96
Dimensional StabilityPassesASTM D7570
Radiant PanelPasses Class IASTM E648-10
Smoke Density<450NFPA 258
Residual IndentationMeets most floor covering requirementsASTM F970