Adhesive & Fasteners Overview

Adhesives and Fasteners

Proper adhesives and fastening methods are critical to the performance, longevity, and quiet operation of a radiant panel system. Following the recommended attachment methods ensures full panel contact, prevents movement or squeaks, protects the tubing, and supports long-term heat transfer performance.

The guidelines below are based directly on the Installation Manuals (Link) and should always be followed for warranty compliance and best results.

Recommended Adhesives & Glues For Ecowarm^®

REGULARLY UPDATED – Check website for most current recommendations. Note: Bostik Green Grip and Bostik WoodGrip Plus are available at Lowes. Bostik Best, Bostik Green Force, and Mapei Eco 980 are available at most lumber liquidators.

Fastening to Wood Subfloors

After panels are glued, they must be mechanically fastened to the wood subfloor.

Approved fastening methods:

• Glue and screw
• Glue and cross-staple

Screw fastening guidelines:

• Full-size panels require 11 screws per board
• Typical spacing
• Screws must penetrate the subfloor by a minimum of 1/2 inch

Staple fastening option:

• Panels may be glued and stapled, then cross-stapled
• Cross-stapling uses two staples installed at opposing 45-degree angles for added holding strength

These fastening methods ensure panels remain flat, secure, and free from movement that could affect floor finishes or system performance.

Glues For Adhering Ecowarm® EPS To Concrete Subfloor

Locktite PL300 Foam Adhesive is a latex water-based adhesive formulation for bonding most foam insulation panels to a variety of porous construction materials including but not limited to wood, gypsum board and concrete. It is compatible with all “un- faced” foamboard insulation products and won’t burn through foam if used as directed. Low VOC formulation meets stringent State and Federal VOC Regulations.

NOTE: Locktite PL 300 IS NOT COMPATIBLE WITH PEX PIPE. Bostik Greenforce is available through Lowes as Green Grip.

NOTE: Bostil Greenforce and Green Grip ARE COMPATIBLE WITH PEX

Glues for Adhering EcoWarm® RadiantBoard™ and EcoWarm® RadiantBoard EPS to a Concrete Subfloor & Adhering Material on Top of EcoWarm® RadiantBoard™ and EcoWarm® RadiantBoard EPS

Glues for Adhering EcoWarm® onto a Wood Subfloor

Most normal construction adhesives will bond Ecowarm to a wood subfloor but low VOC glues contribute less volatile emissions and make for a healthier home. The list below also gives the temperature range at which it may be appied. Coverage Math: Use approximately 25 linear feet of glue per board. Use a minimum 1/8” bead on a very smooth floor and more on an uneven floor. A 28 fluid oz. tube with a 1/8” bead will extrude approx. 340 ft. A 28 fluid oz. tube with a 1/4” bead will extrude approx. 86 ft.

Construction adhesive products marketed as low VOC / their effective temperatures: