How to Repair a Shed Floor that has Rotted

Learn how to repair a shed floor that has rotted. When we updated this she shed, we needed to fix this floor that was rotten. It wasn’t hard!

This was a pretty basic job. We cut away the damaged flooring with our circular saw, added scrap pieces of 2x4s for supports, then attached the new pieces of plywood flooring. There was some smaller gaps where the old floor and new floor met, but we used spray insulation foam.

Remove anything that’s in the way. We needed to remove the garage door.

Step 1

Cut away your rotten wood. Do not hit floor joists.

Step 2

Add 2x4s perpendicular to the joists.

Step 3

Cut your new floor boards to the correct size.

Step 4

Install new plywood.

Step 5

Attach flooring to your supports and joists. We used 1 1/4″ Spax screws.

Step 6

Caulk or spray foam where the wood meets.

Step 7

We will add flooring over it once the rest of the shed is finished.

Step 8

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Danielle Pientka

Danielle is a DIY/craft/sewing blogger on DIYDanielle.com.  She loves to write about projects that she makes for her small farm, her children, and her home.