How do you prevent wooden doors from warping?

Warping is the #1 enemy of wooden doors, so we engineer against it from the timber yard. All solid stiles and rails are kiln-dried to 8-12% moisture content and stored in a climate-controlled workshop for at least 4 weeks before machining. The core is cross-laminated finger-jointed pine or MDF/HDF, and veneer is applied to both faces with equal thickness and grain direction to balance internal stress.

Every batch goes through a 72-hour humidity cycle (95% RH then 20% RH) and is measured for bow, twist and cup before painting. With this process our doors hold a straightness tolerance of ≤2 mm over 2100 mm, backed by a 5-year warranty against structural warping.