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PROVA Corner Inside Waterproof Corner

PROVA Corner Inside Waterproof Corner

$34.94
$34.94 - $336.25
$34.94
$27.95
$27.95 - $269.00
$27.95

Seal every corner with confidence. The PROVA Inside Preformed Waterproofing Corner delivers fast, reliable waterproofing protection where leaks and mold most often start — corners of showers, tub surrounds, and wet areas. Designed for tile pros who value precision and efficiency, this pre-shaped inside angle corner eliminates cutting, folding, and guesswork for a clean, watertight seal every time.

  • Eliminates Guesswork – Ready-to-install 90° inside corner made from PROVA Mat - eliminates trimming, folding and seams.
  • Prevents Leaks – Seals critical transitions at shower bases and curbs
  • Mold & Mildew Resistant – Inhibits microbial and fungal growth
  • Saves Time – Reduce time on every job while ensuring consistent, professional results.
  • Smooth Finish for Tile – 25.59 mil (0.65 mm) thick, reduces build-up 
  • System-Engineered Compatibility – Works seamlessly with PROVA Mat, Joint Strip, Outside Corners and PROVA underlayment systems.
  • Installer-Friendly – Bonds easily with polymer-modified thinset mortar
  • Lifetime System Warranty – Backed by PROVA Tile Installation Products Warranty (when installed as part of PROVA Mat Waterproofing System).
Specifications

Thickness: 25.59 mil (0.65 mm)
Dimensions: 4.5" x 2.25" x 3.5" (11.43 cm x 5.72 cm x 8.89 cm)
Material: Polypropylene
Warranty: Limited Lifetime (T&Cs Apply)
Certification: IC-ES Certified (Listing No. ESR-3603)
Setting Material: Premium polymer modified thinset mortar required.

Approvals:
ASTM D4068-01 (Annex 2) - Waterproofness
ANSI A118.10 (section 4.1) - Fungus and microorganism resistance
ASTM E96 (Procedure E) - Water vapor permeance

Downloads

Installation Instructions: PROVA Mat Installation Instructions.pdf
Product Sheet: PROVA Mat Product Sheet.pdf
Safety Data Sheet: PROVA Corner & PROVA Pipe Seal Safety Data Sheet.pdf
Warranty: PROVA Tile Installation Products Lifetime Warranty.pdf

Select Pack Size: 4 pack
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Waterproof Shower Corners with Confidence

Waterproof Shower Corners with Confidence

  • Perfectly Preformed for Inside Corners – Ready-to-install shape eliminates the need for cutting or folding membrane, ensuring a perfect fit every time.

  • 100% Waterproof Protection – Seamlessly seals vulnerable inside corners where leaks most commonly occur.

  • Ideal for Wet Area Applications - Seal wall-to-floor and curb corners in showers, tub surrounds, and wet rooms

  • Fast, Clean Installation – Saves valuable jobsite time by simplifying one of the trickiest waterproofing details - shower corner waterproofing.

  • Engineered for PROVA Systems – Designed to integrate perfectly with PROVA Mat & PROVA Joint waterproofing components.

  • Durable and Flexible Material – Resists cracking or tearing during installation and movement, maintaining a watertight seal long-term.

  • Pre-formed Reliability – Factory-formed corners provide consistent performance that’s hard to achieve with hand-folded membrane.

  • Lifetime System Warranty – Covered under the PROVA Lifetime Warranty when installed as part of PROVA Mat Waterproofing System.

Testimonials