How do you minimize thermal expansion with a rolled ridge vent since unlike 4-foot stick ridge vents you cannot leave a gap between sections during installation?

There are special additives in the rolled ridge vents that help minimize thermal expansion.

There are special additives in the rolled ridge vents that help minimize thermal expansion. Since rolled ridge vents are so long without breaks, it is more critical that they have this special additive than 4-foot stick ridge vents. This additive reduces the thermal expansion of the plastic, significantly reducing the tendency for the vent to expand and buckle in warm weather if it is installed in cooler weather. It is always advisable to refrain from installing ridge vents in freezing weather if at all possible.