My FL is placed on the main wood floor above basement.
In order to strength the floor, 4 pieces of 12"X12"2.5" concrets slabs, each weighs about 22 lbs, are used to place under the FL.
The FL has been working satisfactory even without the slabs.
Adding slags have further improvement.
This improvement only costs about CAD 10.

In order to strength the floor, 4 pieces of 12"X12"2.5" concrets slabs, each weighs about 22 lbs, are used to place under the FL.
The FL has been working satisfactory even without the slabs.
Adding slags have further improvement.
This improvement only costs about CAD 10.
