Intertek Directory of Building Products

MaxFelt Synthetic Roofing Underlayments Company: Max Roofing Products, LLC Code Compliance Research Reports: CCRR-0340

MaxFelt NC is a mechanically attached synthetic underlayment comprised of a cross-woven polypropylene base scrim laminated onto a non-woven scrim. The exposed and sheathing sides of the underlayment are coated. The underlayment has an overall weight of 1.8 pounds per 100 square feet and is available in 48 inches wide by 250 feet long. The underlayment may also be labeled as MaxFelt 15.

MaxFelt TS is a mechanically attached synthetic underlayment comprised of a cross-woven polypropylene base scrim laminated onto a non-woven scrim.  The exposed and sheathing sides of the underlayment are coated. The underlayment has an overall weight of 2.1 pounds per 100 square feet, and is available in rolls 48 inches wide by 250 feet long. The underlayment may also be labeled as MaxFelt XT and MaxFelt AR.

MaxFelt 120 is a mechanically attached synthetic underlayment comprised of a cross-woven polypropylene base scrim laminated onto a non-woven scrim.  The exposed and sheathing sides of the underlayment are coated. The underlayment has an overall weight of 2.7 pounds per 100 square feet, and is available in rolls 48 inches wide by 250 feet long. The underlayment may also be labeled as MaxFelt 30.

MaxFelt 160 is a mechanically attached synthetic underlayment comprised of a cross-woven polypropylene base scrim laminated onto a non-woven scrim.  The exposed and sheathing sides of the underlayment are coated. The underlayment has an overall weight of 3.5 pounds per 100 square feet, and is available in rolls 48 inches wide by 250 feet long. The underlayment may also be labeled as MaxFelt 180.

FIRE CLASSIFICATION
CLASS A Assemblies
ASSEMBLY NO. E108-RFU-55100-01
Slope:          2:12 (min.)
Deck Type:  Combustible
Details:
  • Minimum nominal 3/8 in. thick code compliant exterior grade plywood
  • Single layer of MaxFelt TS, MaxFelt XT, MaxFelt AR, MaxFelt 120, MaxFelt 30, MaxFelt 160, or MaxFelt 180 roofing underlayment mechanically fastened to the plywood every 12 in. oc in the field and 6 in. oc on the perimeter using plastic cap nails.
  • Asphalt shingles Listed per ASTM D3462 with a minimum weight of 190 pounds per 100 square feet installed per manufacturer's installation instructions.
ASSEMBLY NO. E108-RFU-55100-02
Slope:          2:12 (min.)
Deck Type:  Combustible
Details:
  • Minimum nominal 3/8 in. thick AC Grade Fir Plywood
  • Single layer of MaxFelt NC or MaxFelt 15 roofing underlayment mechanically fastened to the plywood every 12 in. oc in the field and on the perimeter using plastic cap nails 1-1/4 in. roofing nails. Horizontal joints have 4 in. overlap.
  • Asphalt shingles Listed per ASTM D3462 with a minimum weight of 180 pounds per 100 square feet installed per manufacturer's installation instructions.
 
CODE COMPLIANCE RESEARCH REPORT
EVALUATION METHOD BUILDING CODE CCRR NUMBER
ASTM D8257
ICC-ES AC188		 2024, 2021, and 2018 IBC
2024, 2021, and 2018 IRC
2026 and 2023 FBC		 CCRR-0340

Florida Product Approval
Report Number Product Covered
FL No. 42142 MaxFelt NC, MaxFelt TS, MaxFelt 120, and MaxFelt 160 Synthetic Roofing Underlayments
Listing Report Return to Search
Attributes
CriteriaASTM E108 (2017)
CriteriaICC-ES AC188 (2015)
CriteriaASTM D8257/D8257M (2022)
CriteriaASTM E108 (2025)
CSI Code07 30 05 Roofing Felt and Underlayment
Listing SectionROOFING MATERIALS
Spec ID55100
Design Documents
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Code Compliance Research Reports
Public Documents
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