MasterSeal 550 - Flexible, cementitious waterproofing membrane

How does MasterSeal 550 work?

Flextight is an acrylic-modified, Portland cement-based flexible, waterproofing membrane for concrete and masonry. Use it above or below grade on interior or exterior surfaces.

Recommended uses:

  • Walls and floors
  • Tiled pools and fountains
  • Plaza decks
  • Balconies
  • Mechanical rooms

What makes MasterSeal 550 a unique solution?

  • Waterproof membrane
  • Creates a flexible membrane
  • Breathable
  • Ready-to-use kit

How can you benefit from MasterSeal 550?

  • Protects against soil moisture and water seepage; extends life of structural slabs and underlayment
  • Accommodates substrate movement; prevents cracks from telegraphing; provides excellent underlayment for thin-set tile applications
  • Allows interior moisture vapor to escape
  • Easy to mix and place
  • Environmentally friendly; low odor


MasterSeal 550: Technical Data Sheet

pdf (225.23 Kb)