Is Verti-Block more expensive than Allan Block? No, A Verti-Block® costs less per sq. ft than an Allan Block when you factor in labour, installation time and square-footage per block. Verti-Blocks® are stronger and larger in size, as well as require less man power to install. What is a Verti-Block? A Verti-Block® is a pre-cast concrete block formed with a natural rockface…