Brother Russ first introduced us to this genius technique at Heather's house. Because the sub-floor has lived a good life for over 50 years, we decided to give it a little help to make it stronger for the next 50 years. Dad cut the plywood into 14" strips, applied Liquid Nails and then we screwed it to the sub-floor from underneath. This photo is of the laundry room "ceiling" which also happens to be the bathroom sub-floor. You can see we've attached the reinforcing plywood. We will also attach 2x2's to the floor joists for further support, we just haven't done that yet in this photo.
We will do the same reinforcement under the front entry and kitchen where I plan to install tile.
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