These wide boards look like high-end painted wood "sticks," but they're actually primed MDF milled with exceptionally crisp profiles, such as V-groove and bead and cove (see insets). For humid bathrooms, use an MDF made to resist dampness. A.
V-groove MDF: ½
" thick x 11" wide x 36" high, about $3.80 per sq. ft., Nantucket BeadboardB.
Bead-and-cove MDF: ½
" thick x 12" wide x 36" high, about $4.95 per sq. ft., Nantucket Beadboard