10/25/2026
Installing stone veneers has changed a lot in 13 years. When I first learned to install fast stack stone veneers you just installed some tar paper, mesh, and threw up a scratch coat of spec mix.
Fortunately quality has caught up to the process and water management and longevity has taken hold. Aside from swapping traditional tar paper with synthetic roofing paper we are now utilizing weep screeds, polymer mixes, and rain screen materials in our stone installation. We picked this updated process up last year and I'm a big fan of it.
It all starts with a simple weep screed at the base of your project. These pictures are on the mailbox of the project we did this one so we did not have a drip cap included like we have on the house. The weep screed allows any water that has permeated the scratch coat layer to enter a rain screen material behind the mesh and exit out the bottom of the structure via the weep screed. So we have a weep screed at the bottom covered by a layer of synthetic roofing paper to protect the osb layer. Over the paper is a layer of rain screen material. On top of the rain screen is your traditional metal lathe that accepts the spec mix scratch coat. To adhere the stone materials we are using polymer modified setting materials from Tenon (masonry veneer mortar). This product is similar to thin set as it has a slack time that requires a remix and an open bucket time. The mixture includes small fiberglass strands that help with the materials integrity.
What may seem like a lot of extra materials and extra steps is actually helping keep your structure dry and ready to tackle the harshest rains.