ThermaRod is a closed-cell polyethylene foam rod engineered for professional filling and sealing of construction gaps, expansion joints, and installation passages in walls, floors, ceilings, and foundations. Available in diameters from 6mm to 70mm, it provides excellent water and chemical resistance. Ideal for window and door installations, floor screeds, and panel constructions. Indoor use. Maximum service temperature: +95°C.
Professional gap filling and joint backing for construction and renovation.
ThermaRod is flexible PE Foam Rod for Gap and Joint Sealing, delivers reliable, flexible protection for construction gaps where building materials require controlled sealing and backing. The closed-cell structure provides water vapor resistance and prevents water vapor deposition—particularly valuable for window profiles and exposed balconies. With less than 1% water absorption after 168 hours immersion, ThermaRod maintains dimensional stability and performance in moisture-prone areas.
ThermaRod is chemically resistant to cement, gypsum, lime, concrete, resin masses, bitumen, dilate acids, and alkali solutions—making it compatible with all standard building materials. Available in flexible coils (Ø6–30mm) and rigid 2m lengths (Ø35–70mm), it supports efficient installation across renovation and new construction projects. Its semi-rigid, grey polyethylene foam is odourless and easy to apply.
Performance you can trust
Why choose ThermaRod
Specify ThermaRod for professional-grade gap sealing, backed by proven chemical and water resistance, flexible sizing, and reliable long-term dimensional stability in construction and building renovation.
Indoor-Ready & Safe
Odourless, semi-rigid grey foam approved for indoor construction use, no harmful emissions or safety hazards.
Water & Condensation Control
Closed-cell structure prevents water vapor deposition and resists moisture absorption (< 1% after 168-hour immersion).
Chemical Compatibility
Resistant to cement, gypsum, lime, concrete, bitumen, dilute acids, and alkali solutions, compatible with all standard building materials.
Long-Term Durability
Sealed cellular structure maintains performance and dimensional stability across varying construction environments for years.
Easy & Flexible Installation
Available in flexible coils (Ø6–30mm) and rigid lengths (Ø35–70mm) for straightforward, efficient gap filling in walls, floors, and ceilings.
Wide Diameter Range
Sizes from 6mm to 70mm enable optimal fit for expansion joints, installation passages, window/door frames, and structural gaps.
ThermaRod Tube
ThermaRod Coil
ThermaRod Semi-circle
See the impact in real projects
EXPERIENCE THE THERMAFLEX DIFFERENCE
Why work with us
Thermaflex combines decades of expertise with a commitment to sustainable innovation. As your trusted partner, we deliver more than products, we provide comprehensive technical support, proven solutions, and collaborative partnerships that help you achieve project success, regulatory compliance, and long-term operational efficiency across various markets and applications worldwide.
Trusted benefits
- Expert support
- Global experience
- Reliable delivery
- Flexible solutions
- Innovative approach
Partner advantages
- Sustainable practices
- Technical guidance
- Long-term partnerships
- Proven quality
- Customer-focused
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