USA USA USA
USA USA USAMADE TO LAST. DELIVERED FAST.
ASTM tested & certified
For Proven Performance & Efficiency
Proudly made in the USA
Using Only Quality Raw Materials
Always in stock
Deeply Inventoried 1,000,000+Sq Ft Warehouse In Upstate NY
Most orders ship within 48 hours*
*Order Before 1Pm, M-Fr
LOCKS IN ENERGY EFFICIENCY. BLOCKS OUT ≈96% OF RADIANT TEMPERTURE TRANSFER.
Flexeal™ Duct Insulation For HVAC Systems
BOOSTS THERMAL PERFORMANCE
Block energy loss in ducts and ventilation systems with our flexible, durable reflective bubble foil insulation.
With this insulation, you can choose single or double thickness with ASTM-certified R4.2 grading to meet every application. Lightweight, tear-proof, and easy to install, it seals tightly and keeps HVAC systems running efficiently.
Flexeal™ Metal Structure Insulation
KEEPS OUT DRAFTS, HEAT, COLD, AND MOISTURE
Metal conducts heat and cold too easily. Our reflective insulation keeps energy where it belongs—inside.
By installing Flexeal™ insulation, you keep temperatures stable, reduce condensation, and improve comfort in barns, warehouses, and metal buildings of all sizes.
Flexeal™ Under Concrete Insulation
ULTRA-FLEXIBLE. ULTRA-EFFICIENT.
Traditional insulation often leaves gaps that waste energy.
Flexible and lightweight, our under-slab insulation conforms to any floor grade to prevent pockets and voids. As a result, when placed under concrete slabs or around radiant floor systems, it blocks temperature loss and spreads heat evenly.
Flexeal™ Sill Sealer
SEALS UP EVERY GAP AND LEAK
Crafted from dense micro-cell polyfoam, our sill seal compresses and expands to adapt to irregular surfaces.
As a result, it seals gaps, blocks air and moisture, and creates a tight building envelope — giving builders confidence and delivering energy savings over the long term.
FREQUENTLY
Flexeal is a U.S. manufacturer of high-performance reflective insulation and radiant barriers designed for energy efficiency in buildings. Their product lines include HVAC duct insulation, under concrete (slab) insulation, metal building insulation, and sill seals for foundations.
Flexeal products use multi-layer reflective foil and bubble technology to block approximately 95–96% of radiant temperature transfer, which helps reduce energy loss and improve thermal performance in HVAC systems, floors, and metal structures.
Yes, their insulation is ASTM tested and certified, meaning it meets standardized performance and safety criteria. The products are built to deliver consistent efficiency, durability, and quality performance.
Flexeal insulation is designed, engineered, and manufactured in the USA, with a large warehouse in Upstate New York and fast shipping (most orders ship within 48 hours if placed before 1 PM on business days).
Flexeal insulation is used in a variety of construction and building applications, such as:
- HVAC systems (duct insulation),
- Under concrete slabs and radiant floors,
- Metal buildings and structures,
- Foundation sill sealing, and more.
IN THEIR OWN WORDS
