ALCO Updates

New Product

ALCO Shield Black MAG Underlayment
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Installation Guide

ALCO Shield Detail Drawings
ALCO Shield Underlayment Installation Instructions & Drawings
are now available Online. Click Here to View...

Product Highlights

Granular+ Underlayment

The NEW & Improved ALCO Shield GRANULAR+ is now available. More...

ALCO Roof Repair Tape
24/7 Roof Repair Tape - Now available - Leak and Seam Repair Tape for TPO, EPDM, and Metal with Ultra Aggressive Sealability. More...

ALCO Warranty Information


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800-323-0029 for information on where to buy ALCO Roof Products.


Alco-Shield High Temp (HT) Ice and Watre protector underlayment


ALCO Shield™ HT Ice and Water Protector is designed to be used as a waterproofing underlayment with standing seam metal roofing, metal shingles, metal roof panels and asphalt shingles. ALCO Shield™ HT protects roof structures, roof assemblies and the building interior from water penetration caused by ice dams, pooling water and wind driven rain.

ALCO Shield™ HT is a polymer modified asphalt underlayment membrane, polyester fabric surface that provides a tough skid resistant underlayment and UV protection.


ALCO Shield High Temp Ice & Water Protector
The ALCO SHIELD™ HT underlayment product offers a high temperature installation rating with the ALCO high standard of manufacturing.



  • Self-adhering for easy installation
  • Split Release - peel off backing sheet
  • Proprietary formulation and adhesive backing - Installs in most hot or cold weather conditions
  • Top adhesive selvadge-edge - eases alignment and enhances lap sealing
  • Exceptional manufacturing process and quality control for a consistent product
  • Meets or exceeds industry standards and residential/commercial building codes
  • Meets current ASTM D-1970 criteria.
  • Made in Detroit - USA


  • High temperature resistance of 240° F
  • Self Sealing: Seals around nails, staples and screws
  • Self-Adhering: Bonds directly to the roof substrate
  • Excellent for under metal, slate, tile or asphalt shingles
  • Repositionable adhesive backing – allows for accurate installations and overlaps.

> View Installation Instructions & Detailed Drawings

> Download PDF Data/Technical Specifications Sheet

> Architectural Specifications