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50+ Years
experience
Flexible Waterproofing Membranes for HVAC Systems
Since 1961, FlexClad has been a leader in manufacturing innovative waterproofing solutions for the HVAC/Insulation and construction industries. Our flagship product, FlexClad, offers a flexible, weatherproof, and economical jacketing system designed to protect pipe and duct applications. With decades of experience, we combine advanced materials like UV-resistant aluminum and cross-linked polymer films to deliver durable, energy-efficient products that reduce long-term costs. Our self-adhering membranes simplify installation while maintaining superior protection against water leaks and vapor transmission.

Backed by a 10-year warranty, our solutions are engineered to preserve thermal insulation efficiency and withstand extreme conditions. As an ESOP company, we prioritize quality, customer satisfaction, and continuous innovation to meet evolving industry needs. Our team is committed to providing technical support, detailed specifications, and tailored solutions for commercial and residential projects nationwide.
Services
FlexClad 400 Membrane FlexClad 250 Membrane Installation Accessories Custom Sizing Solutions Waterproofing Systems
Details
  • Year established: 1961
Highlights and features
  • We have over 60 years of experience in waterproofing membrane innovation.
  • Our UV-resistant products provide indefinite exposure protection.
  • Self-adhering technology reduces material and labor costs by up to 30%.
  • Aluminum surface reflects heat, lowering energy consumption by 15-20%.
  • 10-year warranty ensures long-term performance and customer confidence.
What people say
Superior waterproofing Easy installation Energy cost reduction Long-lasting durability Excellent UV resistance
Services
FlexClad 400 Membrane
FlexClad 400 is a 45-mil self-adhering membrane with UV-resistant aluminum and cross-linked polymer layers. It seals around fasteners, conforms to complex shapes, and resists vapor transmission. Ideal for exterior, interior, and sub-grade applications on metal, PVC, and concrete surfaces.
FlexClad 250 Membrane
FlexClad 250 is a 25-mil self-adhering membrane designed for ductwork and piping systems. Its lightweight construction allows easy installation while providing waterproofing and energy efficiency. Suitable for direct burial and thermal insulation preservation.
Installation Accessories
Low VOC spray adhesive enhances adhesion in extreme temperatures. Steel seam rollers secure side/end laps. All accessories improve installation efficiency and bond durability for FlexClad membranes on various substrates.
Custom Sizing Solutions
Slit sizes and custom dimensions available for FlexClad products. Solutions for odd-shaped ducts, pipelines, and storage tanks ensure complete coverage and waterproofing protection in challenging applications.
Waterproofing Systems
Comprehensive waterproofing systems for HVAC ductwork, piping, and insulation. Products resist water leaks, maintain thermal efficiency, and reflect sunlight to reduce energy costs in commercial and residential buildings.
Questions
What is FlexClad used for?
FlexClad protects HVAC ductwork, piping systems, and insulation from water leaks, vapor transmission, and UV damage in above/below-grade applications.
How does FlexClad reduce energy costs?
The reflective aluminum surface reduces heat absorption, lowering cooling costs by 15-20% in commercial buildings.
Can FlexClad be used underground?
Yes, FlexClad 400 and 250 are suitable for direct burial applications and sub-grade waterproofing.
What substrates work with FlexClad?
Metal, PVC, CPVC, concrete, rigid board insulation, and most clean, dry surfaces.
How long does FlexClad last?
Backed by a 10-year warranty, FlexClad maintains performance for decades under normal conditions.
How do I order FlexClad samples?
Request free samples through our website or contact MFM Customer Service at 800-882-7663.