Skip to content
APOC Weather-Armor HT³ High Temp Premium Roof Underlayment, 2 Square Roll
Regular price $246.00Orders start at $399 — combine any items to reach the minimum. Learn more
APOC Weather-Armor HT³ High Temp Premium Roof Underlayment, 2 Square Roll
APOC Weather-Armor HT³ is a premium high-temperature roof underlayment and leak barrier for use under metal, tile, shingle and slate roofing, supplied as a 2-square roll. Built with high melt bitumen, a cross-laminated polypropylene surface and flexible rubber polymers, it resists heat up to 265 °F and protects against wind-driven rain, water intrusion and ice dams. One roll per order.
Key Features:
- High temp resistance: Specifically designed to resist heat up to 265 °F for hot climates and high-heat conditions.
- Advanced construction: Made with high melt bitumen, a high performance cross-laminated polypropylene surface, and highly flexible rubber polymers.
- Tri-Bond adhesive: Utilizes Tri-Bond's patented 3-component adhesive system.
- Multi-roof compatibility: Ideal under metal, tile, shingle, slate and other roof systems.
- Leak barrier protection: Protects against wind-driven rain, water intrusion, and ice and water dams.
- Strongest in class: Described as the strongest and most durable underlayment in its class, providing a waterproof membrane.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | APOC |
| Sell unit | 1 roll, 2 squares |
| Product line | Weather-Armor HT³ High Temp Premium Roof Underlayment |
| Material | High melt bitumen with cross-laminated polypropylene surface and flexible rubber polymers |
| Available sizes | 2 square per roll |
| Coverage per unit | 2 squares per roll |
| Heat resistance | Resists heat up to 265 °F |
| Adhesive system | Tri-Bond patented 3-component adhesive system |
| Intended use | Underlayment and leak barrier under metal, tile, shingle and slate roofing systems |
| Protection | Wind-driven rain, water intrusion, ice and water dams |
| Indoor benefit | Waterproof membrane helps keep the home dry for a cleaner, healthier indoor environment |
Coverage & How Much You Need:
One roll covers 2 roofing squares (200 sq ft of roof area) before lapping. Lap courses per the roof system manufacturer's requirements, which reduces net coverage, and order extra for valleys, eaves and other critical areas.
Fit and Compatibility:
Designed as an underlayment and leak barrier beneath metal, tile, shingle, slate and other roof systems, especially in hot climates. It installs under the finished roofing and pairs with standard underlayment fastening and lap-sealing practice.
Frequently Asked Questions (FAQ):
Q: What is included?
A: One roll of APOC Weather-Armor HT³ High Temp Premium Roof Underlayment, sized at 2 squares per roll.
Q: Which roofing systems can it go under?
A: Metal, tile, shingle, slate and other roof systems.
Q: How much heat can it take?
A: It is specifically designed to resist heat up to 265 °F, making it suited to hot climates and under high-heat roof systems like metal.
Q: Does it protect against ice dams?
A: Yes, it protects against ice and water dams as well as wind-driven rain and water intrusion.
Q: How much does one roll cover?
A: Two squares per roll; net coverage is less once laps are applied.
Q: Why choose HT³ over standard underlayment?
A: It uses high melt bitumen, a cross-laminated polypropylene surface and Tri-Bond's patented 3-component adhesive system to optimize performance under high heat conditions.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
High-temp self-adhered underlayments like HT³ are the right call under metal, tile and slate, where standard asphalt-saturated underlayments can bleed or slip at deck temperatures. Its 265 °F heat resistance makes it a natural pairing with metal roofing over ventilated or hot-deck assemblies. Plan laps around openings and valleys first, and stage rolls out of direct sun on hot days.
Follow the manufacturer's application instructions for substrate condition and temperature, use proper fall protection and roof-walking precautions during installation.
Upgrade to APOC Weather-Armor HT³ underlayment for high-heat leak protection under metal, tile and slate.
All third party trademarks, including logos and icons, referenced on our website and product pages remain the property of their respective owners. Unless specifically identified as such, Arbor's use of third party trademarks does not indicate any relationship, affiliation, sponsorship, or endorsement between Arbor Home and the owners of these trademarks. Any references by Arbor Home to third party trademarks are to identify the corresponding third party goods.
