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What is the thermic expansion of Polyboard?

April 26, 2017expansion polyboard thermic

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What is the thermic expansion of Polyboard?

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Polyboard will increase by 1/4 ” for a sheet of 8 ‘, in varying temperatures between 50F and 75F. It is necessary recommended to leave a distance from 1/4 ” between complete panels, particularly outdoors. It is also recommended to make bigger holes or grooves to prevent any undulations.