Aluminum double floor

[givemeabreak]

Here's what I did. I had a 16' Starcraft with a slight v bottom. I could see the floor flex when I hit waves, so I knew a few ribs were cracked. After removing the carpet and thin(.08" thick) aluminum floor, I cut lengths of aluminum channel to fit over the ribs. Got a welding shop to weld them to the ribs, making a flat, not v-bottom floor like the old one. I filled the space between the floor and sub-floor with sheets of blue insulation from Lowe's, cut to fit between the ribs. Put a bead of caulk along each channel, then screwed a 1/8 sheet of aluminum to the channels. Made a very strong, flat floor. I also sprayed expanding foam into the sides between the outer and inner walls. Added a little flotation and deadened the noise. The boat is a 1984 riveted boat, that is still going strong.