T-111 — Siding Problems !!better!!

The grooves aren’t just cosmetic — they create vertical channels that suck water upward by capillary action. Once the bottom edge touches damp ground or a splash zone, moisture wicks into the untreated plywood core. Result: swelling, delamination, and a perfect mold buffet.

T-111 (or T1-11) siding, popular for its rustic "board and batten" look and low cost, is notorious for performance issues—primarily because it is essentially exposed sheathing (plywood or OSB) with very thin protective layers. Most problems stem from its extreme vulnerability to moisture . t-111 siding problems

T-111 is a budget-friendly, rustic-looking siding that performs well if installed perfectly and painted meticulously. However, if maintenance is skipped or installation is flawed, it is prone to catastrophic failure. It is generally considered a "high maintenance" product compared to modern alternatives like fiber cement or engineered wood. The grooves aren’t just cosmetic — they create