Dive summary:

• Earlier advice stressed the importance of having daily construction reports that can be used if a contractor needs to claim extra money from  a client because of delays or unexpected problems, and there are similar steps that should be taken in the office, too.
• Records of all meetings and internal discussions can help show a record of trying to work out a problem before it was necessary to file a claim.
• Another tool in the contractor's box is a record of all correspondence related to the subject of the claim, including that with the client about the issue and anything written to or received from subcontractors

From the article:

If a contractor expects to seek additional compensation for an encountered condition, it should create an additional job cost category describing the extra work. ...