Can fibreglass be applied directly over blockwork?
Yes, but….. blocks should be sealed with a primary layer of resin before the main ‘lay up.’ The pointing should be flush jointed and any broken corners on the blocks should be filled with a sand/cement mix. The patterning of the blocks will be visible behind the fibreglass but is undetectable once a coating of algae is established over the fibreglass. By the time this primary layer of resin is applied and hardened, coupled with the time spent on pointing the blockwork perfectly it is more cost effective to use polyurethane boards instead.
