Partial obedience is not obedience.
God gave Noah exact instructions, down to the wood and the pitch.
Genesis 6:14 (KJV): Make thee an ark of gopher wood; rooms shalt thou make in the ark, and shalt pitch it within and without with pitch.
Noah did not change the plan or skip a step. He did all that God commanded.
Genesis 6:22 (KJV): Thus did Noah; according to all that God commanded him, so did he.
The Word says it again, so we don't miss it.
Genesis 7:5 (KJV): And Noah did according unto all that the LORD commanded him.
Real faith shows up in what we do.
James 2:17 (KJV): Even so faith, if it hath not works, is dead, being alone.