I am building a 15'x23' deck in Knoxville. I built a sandwich girder at the end using 12" x 16" deep concrete piers, 4x4 posts sitting on galvanized metal brackets and pressure treated 2x10's sandwiched together using 3" nails and 1/2" lag bolts 6 inches long. I left the braces I used to hold the 4x4 posts on and staked to the ground.
I have installed around 10 joists that are 2x10" p.t. lumber. I noticed a gap at the top of the joist about 1/2" wide. I should have stopped to assess the problem but being anxious to finish I just kept going.
I noticed when I placed a hammer on the girder that it was no longer level. I thought about using shims when I lay the decking but that seems so, shall I say, unprofessional. I also noticed that the girder is beginning to snake in the middle.
My instincts tell me to take it apart and fix the girder but that is something that I dread doing. This is my first time building anything. Are my instincts right or can I do something else.