Redhibition is the avoidance of a sale on account of some vice or defect in the thing sold, which renders it either absolutely useless or its use so in- convenient and imperfect that it must be supposed that the buyer would not have purchased It had he known of the vice. Civ, Code La. art 2520.
This is a warranty imposed by law in Louisiana. It can be waived, but must expressly be waived by informed consent of the party waiving it, a waiver form is not enough. You must intelligently waive your right to redhibition after informed consent, meaning you voluntarily and intelligently waived it.
When you waive it the above right is waived but other warranty of merchantibility may still apply or warranty agreed to in contract may apply unless all others waived too.
I have not bought a house in Louisiana, therefore am not sure if this is common in all real estate contracts. If left out you are not protected by implied warranty by law. However, your property may still be protected by a warranty agreed to in the real estate contract other than one implied by law. Read carefully or hire attorney to check agreement.