If your base is 2 inches deep, assuming you have crushed rock underneath…
One bag of this screening covers 3 sq ft at 2 inches deep, that's what the specs say at least. I have yet to use it as I'm still waiting for the delivery from Lowe's, which has been delayed.
Your area is 7 ft x 9 ft, that's 63 sq ft.
So you need 63/3 = 21 bags at 2 inches deep.
If your base is less or more deep, repeat these calculations with new figures. For instance, if your base is 3 inches deep, you will need 21 x 3 / 2 = 31.5 bags (or 32 bags).
Based on what others have said, get a couple bags more than what you need, or just adjust the depth of your paver base.
Date de publication: 2020-08-02