James Hardie Primeline Heritage Weatherboard 4200 x 300mm x 9mm Available in styles to match many heritage weatherboard homes, PrimeLine Weatherboards are a durable range of 9mm thick weatherboards for creating classic lines. PrimeLine is a range of durable fibre cement weatherboards in a range of profiles that imitate traditional and contemporary timber weatherboard styles. Being fibre cement, PrimeLine weatherboards resist damage from rot, moisture, termites and fire when installed and maintained correctly. The time saving HardieLock insert sets the board overlap. Achieves the deep shadow line of a much thicker board. Pre-primed and ready to be painted on-site. For extra shadow lines, Primeline Heritage weatherboard profile has a rebated edge and comes in double board height for fast installation.