I tried screwing deck screw the subfloor to the joists on both sides of where the squeak is coming from and it's still there. I tried looking underneath and saw that there's a beam 6 inches between the joists. Can I screw into this? It doesn't look like the floor joists and it seems that's the only spot that has that extra beam. Does anyone know what it's for? It's also painted red if that matters and it doesn't have that "I" shape like the joists.