How can you tool the joints in a rowlock masonry barrel vault? Won't the formwork prevent this?
Joints on the underside of a barrel vault generally are pointed after wood forms are removed. Some contractors attach 3/8-inch-wide by 1/2-inch-high ribs of wood to the plywood surface at the location of mortar joints. Then they lay up bricks with mortar on the plywood form between these wood ribs. After the plywood forms are removed, the 1/2-inch-deep joints created by the wood spacers are pointed with mortar. Another approach is to build the vault on a smooth plywood form. After the form is removed, joints can be ground out and repointed.