Damp Proof PVC Ceiling Panel Garage Conversion Cover for Home Extra Room Ceiling Use A garage turned into an extra room keeps a cold concrete slab below, and the ceiling above it takes damp air rising in the wet months, so a board that swells at the joints is a problem. Product Specifications Product Name PVC Ceiling Panel Effective Width 1050mm Length Customized Product Thickness 1.0mm-3.0mm Product Width 1120mm Product Overview Product Type: PVC ceiling panel for a garage