How to level sagging floor in old house using shims, not floor leveler, in home renovation

Renovating an old house inevitably comes with sagging floors to some degree. This time we were faced with 2nd story floors which were out of level. In an effort to add as little weight as possible to the aging floor joists, we choose not to use floor leveler (which is essentially concrete).
To determine actual level, a laser level is a helpful tool in this process as well and can be found on Amazon:
DEWALT Line Laser, Self-Leveling, Red, 3-Beam (DW089K)
by Dewalt
https://amzn.to/3xNbY3K

A similar less costly laser level is :
KAIWEETS Self-Leveling Green Laser Level, 360 Laser Line with 2 Plumb Dots, Cross Line 197ft with 7800mAh Rechargeable Batteries & Magnetic Rotating Stand for Construction and Picture Hanging
by KAIWEETS
https://amzn.to/3xGZkDH

Rather than using heavy floor leveler, we opted for use of shims to raise the low spots and create a new level surface. When you can't raise sagging floors from underneath, as in this instance, without damaging the ceiling below, the next best option is to create a new level surface from above.

The process is straight forward. We found the highest spots in the room and placed one end of a 6 foot level :
(https://www.amazon.com/gp/product/B00...
on the high spot and the other end at a low spot. We then used shims (plywood pads) placed on the low spot till the 6 foot level bubble indicated level. Once a wider area was leveled, we could lay down the first sheet of 3/4 inch sub-floor.

Also, if you are in the market for any tools, check out our Amazon store front.
Visit our amazon store front for our recommendations for tools and supplies for DIY success!
https://www.amazon.com/shop/housebarons

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