Natural Stone Moisture Management

Natural Stone Moisture Management

Natural full bed stone veneers create a timeless appearance. As a reservoir cladding, often with large variation in unit size, stone veneers have the potential to absorb a significant amount of moisture in the mortar joints. When detailed for drainage and ventilation, stone veneers remain beautiful for generations.

A best practice for moisture management with full stone is to use a rainscreen drainage mat with mortar blocking fabric to maintain a predictable air gap for drainage and ventilation between the stone veneer and the water resistive barrier. This air gap, combined with effective weeps and ventilation, reduces efflorescence, eliminates mold and moisture issues, and extends the life of the veneer.

Essential Moisture Management Components for Stone

Sure Cavity Rainscreen Drainage Plane

Rainscreen Drainage Plane - Air Gap

Sure Cavity

The air gap in a stone veneer takes on multiple functions, including accommodating variations in stone size to hold the plane of the surface veneer and placing additional mortar to support the stone. Sure Cavity™'s rigid channels and mortar blocking fabric ensure a clear and continuous drainage gap along the entire backup wall. With Sure Cavity to maintain the air gap the rest of the cavity can be slushed full with grout. In the lab and on the jobsite, Sure Cavity rapidly drains and dries walls.

Stone Cavity Weep Drains Walls

Cavity Weeps for Stone

Stone Cavity Weep 

That water that you've drained to the bottom of the wall needs an exit strategy. We know that rope weeps and tubes don't work, and that water doesn't run uphill to drain from cell vents above the bed joint of mortar. The flashing is the lowest point in the cavity - so it makes sense that water should drain directly off the flashing. MTI's Stone Cavity Weep™  is a self-spaced weep system that quickly rolls out on the flashing to create drainage tunnels for rapid drainage at the lowest point in the wall. 

Wall Opening Weeps create drainage tunnels directly on the flashing

Wall Opening Weeps - Above Windows & Doors

Wall Opening Weeps

Weeps work when they create a path for drainage at the lowest point in the cavity wall - in this case, directly on the lintel or shelf angle flashing. Each Wall Opening Weep™ creates 5 weep tunnels directly on the flashing to keep your walls dry. 

Moisture Diverter on Drainage Plane

Moisture Diverter Above Openings

Moisture Diverter

Window rough openings are a common weak spot for moisture problems - but if the rough opening doesn't get wet problems are prevented. The Moisture Diverter™ channels water in the rainscreen drainage plane away from the rough opening to reduce the potential for leaks and keep windows dry. 

Ventilation at Soffits with Floor Edging

Soffit Ventilation

Floor Edging

A ventilating a wall system with vented terminations at the top and bottom of the wall increases the drying power. Floor Edging™ maintains a pathway for ventilation from the air cavity to the exterior - simply tuck-point mortar between the top course of brick and Floor Edging, then score the Floor Edging at the face of the wall and snap off the excess. 

Ordering & Expertise

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