I am wondering should I use morter instead of sand to secure the slate in place. And what is the proper thickness of the gravel to be laid.
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depends to some degree on your climate and intended use.
I like a minimum of eight inches of sound drainage gravel under the finish bed. The slate or blustone can be seated in stone dust also. With anything other than a mortar bed, you will find yourself sweeping or tracking some powder or grit into the house, but with a mortar bed, moisture and freezoing can do you damage. Sand or stone dust wil let moisture drain on through.
Excellence is its own reward!
I like a minimum of eight inches of sound drainage gravel under the finish bed. The slate or blustone can be seated in stone dust also. With anything other than a mortar bed, you will find yourself sweeping or tracking some powder or grit into the house, but with a mortar bed, moisture and freezoing can do you damage. Sand or stone dust wil let moisture drain on through.
Excellence is its own reward!
