What Kind Of Grout Should Be Used For Slates On A Patio

by Manishi
(NY, USA)

Question:
What kind of grout should be used for slates in Patio, where tempaerature can go bleow freezing in winter and to about 40 degree centigrade in summer (105 F)

Answer:
Presuming that you are laying on to a solid concrete base, you could use a polymer modified flexible grout or you could use a basic 4-1 Sand & Cement mix but use an additive with each mix to make it slightly flexible & less susceptible to cracking.

You would need to seal the Slate prior to grouting so that the grout is easy to remove if you intend to slurry grout the joints.

The grout must be pushed down firmly and all joints well filled, as no air should be allowed to remain in the joints. The more grout used means it will set harder