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What is the thermal expansion of Polyboard?

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What is the thermal expansion of Polyboard?

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Polyboard will expand 1/4″ in an 8′ sheet in a temperature range of 50°F to 75°F. It is recommended that a 1/4″ gap be allowed between full sheets, especially in an outdoor setting. It is also recommended that oversized holes or slotted holes be provided to prevent buckling.

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