Epoxy Grout Form Work

Form Work

Form work for epoxy grout is a little different than form work for regular concrete. Forms should be installed approximately 2” to 4” from the outside dimensions of the baseplate. If a concrete foundation is significantly wider than the base (6” on any side), extra steps can be taken to avoid edge lifting. The forms (1) should be constructed of sturdy two by dimensional lumber. The inside of the forms (3) should be waxed with paste wax (not automobile wax) to allow the forms to release when the grout has cured. Chamfer strips (2) should be installed at an elevation to line up slightly above the intended contact surface on the bottom of the base- roughly 1/16” or 1/8” is often sufficient. This will help to ensure you have contacted the bottom of the base plate for proper support. The chamfer strips (2) should also be installed vertically in the corners as shown to the left. The forms should be constructed for a one or two pour design.  Epoxy grout will find its level. Normally a lock-in pour is done first to hold the base and seal the cavity, which is filled on the second lift. This can all be done in one lift but additional formwork would be required to ensure the grout stays in place during the curing process.  Extra care should be taken to make sure the forms are water tight. This means that all of the forms need to be caulked to the foundation and to each other prior to pouring grout.