Find a Rep
Your Rep

Articles & Resources

Technical Detail Library

Total Value / Lifecycle Costing

Project Highlights

Building Industry Articles


Base and Ply Sheets

HPR Glasbase

  • Rot-Proof Protection
  • Superior Performance Characteristics
  • Designed for Demanding Roofing Needs

HPR Glasbase Sheets are an asphalt-coated fiberglass base sheet frequently used as the initial underlayment in a Garland HPR built-up roof system. In addition, HPR Glasbase Sheets can also be used as the nailable base sheet on various roof decks or as the ply sheets in the cold-applied Weatherking system.

Speak with a Rep

Product Specifications


Quality Control Feature Photo

Designed for Today's Demanding Roofing Needs

Today, roofs are larger and flatter. The incidence of thermal shock damage has increased because of the popularity of lightweight metal decks, sophisticated heating and air conditioning systems, and increased insulation. As modern engineering practices have imposed greater demands upon roof system performance, the quality of conventional roofing paper has deteriorated. HPR Glasbase Sheets put an end to the "quality slide." They have the strength and flexibility to meet today's more demanding requirements. 

Inorganic, Rot-Proof Protection

HPR Glasbase Sheets are inorganic, rot-proof roofing sheets. They will not wick or absorb moisture as conventional base sheets do. As a result, the risk of ply delamination is minimized, and a stronger, more secure roof assembly is produced. 

Product Page Feature Photos

Superior Performance Characteristics

HPR Glasbase Sheets meet and exceed the toughest tensile strength tests required by ASTM D 4601, Type II. HPR Premium Glasbase Sheets exceed the requirements of ASTM D 4601 by more than 50%. HPR Glasbase Sheets impart the strength and flexibility your roof requires to stand up to and overcome the elements. 

How can we help?

Provide your email address to receive periodic updates from Garland, including commentary and technical analysis on the issues most important to commercial buildings. We'll also share project highlights of completed building envelope work, and you'll be the first to know about our next innovation.  

RMer Span Curve Panels are being installed onto the North County Regional Library