Home > Products > Paneling & Ceiling > T&G Paneling > Primed MDF Interior 6″ & 8″ Shiplap Gap Siding Primed MDF Gap shiplap pattern siding for interior application. This siding makes a nickel-slot size gap when installed. Special order in 1×6 and 1×8 sizes. Available in 16′ lengths only. Size Choose an option1x6 - 16'1x8 - 16'Clear Primed MDF Interior 6" & 8" Shiplap Gap Siding quantity Add to cart Add to basket for Quote * Please select length and quantity to add to basket for quote. Additional Information