The preferable concrete substrate is a cast-in-place monolithic structural concrete slab. Were there for you beyond the roof too with decking and waterproofing systems that stand out from the crowd.
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Board can go on top of the vapor barrier for insulation and further waterproofing.
Waterproofing Concrete Slab Roof. Premature finishing resulted in widespread delamination. The most effective reference tool for determining concrete surface profiles is the molded rubber comparator chips available from the International Concrete Repair Institute. Masonry walls are built with a damp-proof course to prevent rising damp and the concrete in foundations needs to be damp-proofed or waterproofed with a liquid coating basement waterproofing membrane even under the concrete slab floor where polyethylene sheeting is commonly used or an additive to the concrete.
Concrete provides the best substrate material for waterproofing systems. Tackle any roof installation restoration or maintenance job with on-the-ground support and easy-to-apply silicone urethane and acrylic solutions from Gaco. The blasted concrete surface is too rough to be measured by tape and quantified in microns or mils.
When delaminations can be a problem If the delamination is isolated to just one spot it might not affect the performance of a concrete slab. This is more suitable than pre-cast concrete because pre-cast concrete requires a nominal 2-inch-thick topping to provide a smooth continuous top surface to eliminate the control joints. Concrete Block and Slab Foundations.
Photo 2 - Slab placed on waterproofing membrane on roof slab. Floor poured after the top floors are in place and the roof. With the concrete sound and contaminant-free all thats left is to adequately roughen the surface but to what degree.
But if its widespread then you have a more serious problem that should be addressed.
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