Is Water Proofing Must Before Laying ECA Thermal Insulation Tiles
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Is water proofing must before laying the Expanded Clay Aggregate (ECA) Roof Top Thermal Insulation Tiles ?

Is water proofing must before laying the Expanded Clay Aggregate (ECA) Roof Top Thermal Insulation Tiles ?

Yes, Waterproofing is must before laying the Expanded Clay Aggregate (ECA) Roof Top Thermal Insulation Tiles