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Definition of Cover board
1. Noun. (context: roofing) An insulation board used over closed cell plastic insulation (e.g., polyisocyanurate) to prevent blistering when used in conjunction with hot bituminous membranes. ¹
¹ Source: wiktionary.com
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1. Noun. (context: roofing) An insulation board used over closed cell plastic insulation (e.g., polyisocyanurate) to prevent blistering when used in conjunction with hot bituminous membranes. ¹
¹ Source: wiktionary.com