Evaluation of fire damage far exceeds the Standards of Practice (SOPs) and should be left to professionals. However, you can at least explain the limitations regarding fore damage if you have some knowledge. These two publications can provide you with some information.
Post-Fire Assessment of structural Wood Members
Evaluation of dimensional lumber will be different from that of timbers and glulams. The two categories reflect different assumptions that need to be made during assessment. Most inspectors will be dealing with dimensional lumber, often roof framing in attics.