The 6 Best Places to Buy Waterproofing Membrane Online

Buying a waterproofing membrane online isn’t just about choosing a roll and clicking checkout. The membrane you select, and the supplier you select it from, determines whether your tile assembly stays dry for decades or fails prematurely. Product certification, warranty support, shipping reliability, and system completeness all matter long before installation begins.

With countless online listings and look-alike products, it’s essential to buy a genuine, certified waterproofing membrane from a supplier who specializes in tile waterproofing systems, not a generic reseller. This guide highlights the six best places to buy waterproofing membranes online and the critical checks buyers should make before ordering.

What to Look for When Buying Waterproofing Membrane Online

Before comparing suppliers, focus on the factors that directly impact membrane performance and installation outcomes:

• Certification: Choose premium, tested membranes. PROVA Mat is an ICC-ES evaluated polypropylene sheet membrane designed to meet ANSI waterproofing requirements.
• Warranty: Look for suppliers who offer full manufacturer-backed coverage. PROVA provides lifetime warranty support when installed as directed.
• Expert Support: Waterproofing is detail-centered. Having U.S.-based, real-person assistance available during business hours (8:00–5:00) helps avoid installation errors.
• Shipping Speed and Cost: Reliable timelines keep projects on schedule. ProLux offers free 3–4 day delivery plus discounted 1-day and 2-day express upgrades.
• Full System Availability: Membrane alone is not enough. Look for sellers who stock matching corners, joint strip, and pipe seals so the entire waterproofing system is purchased together.
• Inventory Reliability: In-stock product prevents job delays and scheduling issues.
• Sizing Options: Most suppliers offer one or two roll sizes. ProLux offers 19 sizes, allowing buyers to match membrane coverage to their project with minimal waste.
• Specialization: Big retailers carry thousands of unrelated product categories. Specialized suppliers offer deeper knowledge, better storage, and trustworthy handling.

Understanding Waterproofing Membrane Types

Waterproofing membranes generally fall into two categories:

• Sheet Membranes: Premium polypropylene sheet membranes such as PROVA Mat are embedded in thin-set mortar and create a predictable, consistent waterproof barrier for tiled wet areas. They are ideal for showers, tub surrounds, wet rooms, and other high-moisture environments.
• Liquid-Applied Membranes: Brush- or roller-applied coatings suitable for irregular shapes or small repairs. Performance depends on even application and correct thickness. 

For a complete system, sheet membranes require compatible sealing accessories:

• PROVA Joint for seams and transitions
• PROVA Inside Corners and Outside Corners for plane changes
• PROVA Pipe Seal for plumbing penetrations

The 6 Best Places to Buy Waterproofing Membrane Online

1. ProLux Materials, Official PROVA Distributor

Best for: Premium certified membrane, lifetime warranty support, and expert customer assistance.

ProLux Materials is a specialist U.S. distributor for the PROVA waterproofing membrane system. Unlike general hardware retailers, ProLux focuses exclusively on premium remodeling and construction products, ensuring proper handling, storage, and expert knowledge.

Why ProLux stands out:

• Certified product: Genuine PROVA Mat, ICC-ES evaluated and designed to meet ANSI waterproofing requirements.
• Lifetime warranty: Full manufacturer-backed coverage on PROVA systems.
• Real support: U.S.-based, real-person assistance for installation and ordering (8:00–5:00).
• Fast, predictable shipping: Free 3–4 business day shipping on all orders; discounted Overnight (1-day) and Express (2-day) upgrades.
• Full system in stock: Membrane, corners, joint strip, and pipe seals available in one place.
• 19 waterproofing membrane sizes: More sizing options than any big-box retailer, allowing buyers to reduce cost and waste.
• Specialized supplier: ProLux focuses on high-performance waterproofing and building products, not thousands of unrelated inventory items.

2. Manufacturer Direct Stores

Best for: Projects specified with a particular brand.

Some waterproofing brands offer direct online purchasing. This ensures authenticity but often limits available sizes, accessories, or shipping options. Orders may also take longer to ship depending on manufacturing schedules.

3. Professional Building Supply Retailers

Best for: Contractors who need documentation and commercial-grade ordering.

These retailers typically provide code documentation, downloadable datasheets, and reliable freight services. Stock varies, so ensure membrane, seam bands, and penetrations seals are all available together.

4. Online Marketplaces (Use With Verification)

Best for: Small, quick purchases when the seller is authorized.

Marketplaces like Amazon or Walmart may offer membrane listings, but buyers must confirm that:

• The seller is an authorized distributor.
• The product shows official branding and documentation.
• Batch codes and certifications are provided.

For full shower systems, specialized distributors are typically safer.

5. Major Hardware Chains

Best for: DIYers purchasing liquid membranes or small materials.

Chains like Home Depot offer easy access to liquid-applied membranes, but they rarely stock complete sheet membrane systems with accessories and may carry limited roll sizes.

6. Trade Supply Networks

Best for: Large residential or commercial projects requiring consistency across multiple units.

Trade suppliers provide bulk ordering support and documentation for inspections. Availability varies, and systems may differ by region.

How to Compare Waterproofing Membrane Suppliers

When evaluating where to buy, look for suppliers who clearly provide:

• Product certifications (such as ANSI and ICC-ES recognition)
• Full-system availability
• Clear warranty terms
• Multiple roll sizes
• Consistent shipping options and timelines
• Knowledgeable customer support

Why Buying from a Specialized Supplier Matters

Waterproofing is too important to trust to generic listings or sellers without product knowledge. A specialized supplier ensures:

• The product is authentic and properly stored
• Accessories match the membrane system
• Warranty coverage is valid
• Technical questions receive accurate, real-world answers
• You get the exact roll size your project needs

Frequently Asked Questions

Is it safe to buy waterproofing membranes from online marketplaces?
It can be safe if the seller is authorized and provides proper documentation. For full waterproofing systems or long-term projects, specialized distributors like ProLux Materials offer stronger reliability.

What’s the difference between sheet and liquid waterproofing membranes?
Sheet membranes like PROVA Mat offer consistent thickness and predictable performance under tile. Liquid membranes are useful for irregular areas but rely on precise application.

Can I mix membrane accessories from different brands?
No. Use matching corners, joint strips, and seals to maintain proper bonding and warranty coverage.

How do I confirm a membrane meets building code?
Check for ANSI and ICC-ES documentation. Specialized suppliers provide these details clearly.

Why buy waterproofing membranes from ProLux Materials?
ProLux offers certified PROVA systems, lifetime warranty support, U.S.-based live assistance, free 3–4 day shipping, express shipping upgrades, full-system availability, reliable inventory, and 19 membrane sizes.