Stonecrest's proximity to Arabia Mountain Heritage Area creates tile installation challenges specific to south DeKalb County. Some properties near the Arabia Mountain monadnock sit on thin soil over granite bedrock, meaning foundation movement at soil boundaries can stress tile differently from typical clay-soil homes. Grout cracking within a few years of installation in these homes is usually caused by localized subfloor movement at granite-soil transitions — not poor tile quality.
The remedy is straightforward: a Schluter DITRA decoupling membrane between the substrate and tile absorbs the minor movement from granite-influenced soil, protecting grout and tile above. We use this product as standard on Stonecrest installations in the Arabia Mountain zone. For standard Stonecrest slab homes away from the granite area, polymer-modified thinset and flexible grout address the minor DeKalb County clay expansion that affects all south Atlanta slab construction.