Senate committee substitute to the 2nd edition makes the following changes. Amends the conditions that must be met in order for dimension lumber that has not been grade-stamped under the authority of a lumber grading bureau to be used in the construction of one-and two-family dwellings as follows: (1) requires that the inspector certifying the lumber also certify that the lumber conforms with product and inspection standards under American Softwood Lumber Standard PS20 and marks the lumber with five specified items including the accrediting agency symbol, the species or combination of species of the lumber, and whether the lumber was dry or green when manufactured and (2) amends the provision concerning code enforcement officials' immunity from lability to provide that code enforcement officials are not liable for any structural failure that occurs as a result of the use of dimension lumber rather than grade-stamped lumber (was, not liable or subject to disciplinary action for willful misconduct, gross negligence, or gross incompetence under Article 9C of GS Chapter 143 for any structural failure that occurs as a result of the use of dimension lumber rather than grade-stamped lumber). Requires rather than allows the Building Code Council to issue temporary rules to implement the act's requirements.