We are planning to build simulated flagstone walks in a shopping center. We plan to produce the simulated joints by inserting thin fiber strips, troweling over them and then stripping them out. Is it necessary to grout the resulting joints? If so, how can we prevent smearing the adjacent surface?
It is usually necessary to grout such joints and the best way to prevent smearing onto the surface of the simulated stones is to use a dry mortar instead of a grout. The base of the joint should be painted with a cement paste and then the mortar packed in. It is best to have two men working on the job. One of them should paint the paste into the joints. Later he should follow behind the man who puts in the mortar to clean up the joint edges using a large, coarse sponge with a bucket of water.