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Modified Plus HD Heavy Duty

Product Description
Installation and
Technical Literature
Specs and details


modifiedPLUS® HDgT4 Heavy Duty Cap Sheet is used as the top ply in a two-ply roofing system and as a flashing membrane for modified bitumen roofing, conventional built-up roofing and as a maintenance repair material. The product incorporates a high tensile composite reinforced mat, providing it with improved mechanical properties compared to traditional products.  HDgT4 has a thermofusible poly lower surface for torching to modifiedPLUS® substrates


  • Heavy duty composition provides greater physical properties
  • Excellent puncture resistance and tear strength
  • SBS polymer provides flow resistance at high temperatures and flexibility at low temperatures for lasting durability
  • Factory applied surface granules to enhance ultra-violet resistance and surface durability
  • Compatible with a variety of Henry’s base sheet products, providing a variety of installation configurations


Data Sheets

Modified Plus HD Heavy Duty Data Sheet Download PDF      

SDS Sheets

Modified Plus HD Heavy Duty SDS Sheet Download PDF      

Tech Talks

High Performance Composite Roofing Systems Using modifiedPLUS® HD Heavy Duty Cap Sheet Download PDF      



modifiedPLUS HD Cap – Torched Spec Sheet – mopped base sheet over insulated deck Download Word File      
modifiedPLUS HD Cap – Torched Spec Sheet – self-adhered base sheet over AC Foam IV Download Word File      
modifiedPLUS HD Cap – HD Cold App Download Word File