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General Description RCM Y-wall is a high-quality flexible calcium silicate based fibre cement building board, perfect for use as a fire rated sheathing board. Offering excellent fire properties as well as high levels of dimensional stability, Y-wall is an exceptional board for use in multiple applications. Y-wall is used primarily as a fire rated sheathing board or building board. Used extensively on both steel frame and timber frame structures, Y-wall is used behind all types of facade solutions, as well in ceilings offering a non-combustible classification. Y-wall is ideal for modular construction methods. Key applications Fire rated sheathing board Ceilings Partition walling OEM applications for improved strength and density Recommended for buildings above 18m Composition Y-wall is a calcium silicate sheathing board manufactured from a mixture of Portland cements, lime, calcium silicate, mica and cellulose.