Product Overview

Dr. Fixit IWC (Integral Waterproofing Compound) is a dry powder admixture manufactured by Pidilite Industries for use as a site-added waterproofing compound in cement mortar, concrete, and plaster mixes. The product is the powder-format counterpart to Dr. Fixit Pidiproof LW+ (which is a liquid admixture) and offers the same fundamental function — reducing the water permeability of the hardened cement matrix — in a powder format that is more convenient for certain batching situations, particularly manual site mixing where measuring and adding liquid admixtures to a dry mix is impractical. Dr. Fixit IWC is added directly to the dry cement and aggregate before water addition, or mixed into the dry mix and then gauged with water, ensuring that the waterproofing compound is uniformly distributed throughout the entire batch without the need to pre-mix the compound with the gauging water. The waterproofing mechanism of Dr. Fixit IWC combines two actions: a calcium stearate hydrophobic agent (derived from fatty acid salts) that coats cement particles and aggregate surfaces with a water-repelling molecular film, reducing capillary absorption of liquid water through the pore network of the hardened mortar or concrete; and a finely divided inorganic filler (typically calcium carbonate and reactive silica) that helps fill pore spaces in the cement matrix to reduce total porosity. The combined effect is a significant reduction in water absorption by capillary suction — the primary mechanism of water ingress in above-ground masonry walls, external renders, and terrace screeds under rain conditions and condensation. Dr. Fixit IWC is widely used in Indian construction as a standard waterproofing additive for waterproof cement-sand plaster on external walls, waterproof screed on terraces, mortar for water tank construction, and plaster for bathroom wet areas. The powder format is particularly suited to small builders and individual house construction where liquid admixture dosing is less consistently followed. Space Arc Engineering supplies Dr. Fixit IWC for plastering contractors, small building contractors, and homeowners undertaking renovation projects throughout Delhi NCR, Ghaziabad, and Uttar Pradesh.

Applications

• External cement-sand plaster waterproofing — integral IWC in render for rain-exposed facades
• Terrace waterproof screed — integral admixture in cement-sand screed over RCC roof slab
• Bathroom and wet area plaster — waterproof base plaster for tiles in bathrooms and kitchens
• Water tank and sump mortar waterproofing — integral admixture in masonry jointing mortar
• Retaining wall masonry mortar — waterproof jointing and bedding mortar for retaining walls
• Garden compound wall plaster — waterproof external render on boundary and garden walls

Key Advantages

• Powder format — adds directly to dry mix without separate liquid measurement — convenient at small sites
• Dual mechanism — hydrophobic stearate plus pore-filling filler reduces capillary water absorption
• Improves durability — denser cement matrix reduces ingress of water and dissolved salts
• Compatible with all mortar uses — plaster, screed, masonry mortar, and concrete
• Economical — low dosage rate per bag of cement makes it cost-effective for large plastering areas
• Well-established in India — decades of use in Indian residential construction as a standard waterproofing additive