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WallDefender™: Helps Keep Cavity Walls Dry and Flashings Functioning Properly


WallDefender™: Helps Keep Cavity Walls Dry and Flashings Functioning Properly

Mortar dropping device that helps prevent mortar droppings from blocking the weeps.


  • Dual levels
  • Trapezoidal shape
  • 90% open weave mesh
  • Up to 54% recycled content


  • An alternative to MortarNet® without an Insect Barrier
  • Breaks up and suspends mortar droppings above the flashing on two levels so weeps stay open
  • Open weave mesh construction provides hundreds of pathways for moisture to exit the cavity
  • Is very permeable to air, water and water vapor due to the low fiber density of the non-woven structure
  • Helps prevent efflorescence and damage from freeze-thaw cycles
  • Easy to transport, handle and cut, even on scaffolding
  • Installs easily on brick ties in multi-story cavity walls
  • Will not degrade, oxidize, or react with common building materials
  • Clean and non-toxic
  • Recycled content helps with LEED certification
  • Helps eliminate callbacks to repair moisture damage
  • Provides masons and building owners with a greater peace of mind
Weep holes must be used with WallDefender to allow effective moisture drainage and wall drying. View details of WeepVent or CellVent to see how they can help keep weep holes open and prevent insects from entering the cavity through the weeps.

Download WallDefender's Technical Datasheet

About Mortar Net Solutions

Mortar Net Solutions™, formerly Mortar Net® USA, Ltd. develops, distributes and supports innovative moisture management solutions for masonry construction.

The company was founded in 1992 by Tom Sourlis and Colin Munro. Sourlis has over 25 years of experience as a mason with extensive architectural training from the Illinois Institute of Technology and Munro is a masonry industry expert with over 45 years of experience, including research, teaching, technical consultation, manufacturing, marketing, and contracting. He has guest lectured at several universities. He is a member of AIA, CSI, and The Masonry Society of which he was a past chairman of Committee C-15: Manufactured Masonry Units and is an honorary member of the Bricklayers & Allied Craftsmen International Union. He recently became a Fellow of ASTM and received their Award of Merit.

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