Phenolic resin foam board, and method for manufacturing same

A phenolic resin foam board having a thickness of 40 mm or more to 180 mm or less, wherein

• a closed cell ratio of the phenolic resin foam board is 90% or more,
• when the phenolic resin foam board is sliced, from one main surface of the phenolic resin foam board, along the main surface into n pieces (n≥5) at approximately equal intervals of 8 mm or more to 10 mm or less in a thickness direction, a density of an n-th specimen is dn, an average density of n pieces of specimens is dave, and a lowest density among the densities of n pieces of specimens is dmin, 0≤(dave−dmin)/dave≤0.12 is established,
• when values for Di=(di+d(i+1))/2 are calculated [wherein i represents an integer of 1 to (n−1)], Di values are plotted in order of a numerical value of i (wherein a horizontal axis indicates i values and a vertical axis indicates Di values), points corresponding to the Di values are connected, resulting in a density distribution curve, no straight line parallel to the horizontal axis intersects the density distribution curve at four points;
• and
• wherein the phenolic resin foam board possesses the following properties:
• I value of a dimensional change rate:
• the absolute value is 0.2 or less in both of the width direction, and the length direction under humidity conditions,
• J value of a dimensional change rate:
• the absolute value is 0.2 or less in both of the width direction, and the length direction under drying conditions,
• KI value of a thickness change rate:
• 1.5 or less under humidity conditions, and
• KJ value of a thickness change rate:
• the absolute value is less than 0.2 under drying conditions.