Waterproofing products: professional solutions against water ingress

The technical market offers a range of chemical formulations to meet specific structural requirements. Cementitious mortars, available in one-component or two-component versions, create a rigid or deformable coating, offer high resistance to hydrostatic pressure (both positive and negative-side) and are suitable for foundations, lift pits and retaining walls. Synthetic resins, notably liquid waterproofing membranes (polyurethane, polyurea or acrylic), stand out for their flexibility and ability to adapt to complex geometries. These materials cure on contact with air, forming a seamless continuous membrane with excellent crack-bridging properties (the ability to span micro-cracks in the substrate). Prefabricated waterproofing membranes, whether polymer-modified bitumen or synthetic sheets (PVC or TPO), remain the standard for large civil and industrial roofs, ensuring constant thickness and high mechanical strength through torch-on or hot-air welding.

The intended use and type of stress determine the correct choice of material. Indoor wet rooms, such as bathrooms, shower enclosures and industrial kitchens, require elastic cementitious systems applied under tiles, designed to protect screeds and ensure perfect adhesion of the subsequent tile adhesives. For waterproofing terraces, balconies and flat roofs, directly exposed to UV rays and seasonal temperature changes, liquid polyurethane membranes or reinforced systems are preferred, as they absorb structural movement and prevent cracking of the flooring. For below-ground structures, bitumen emulsions or bentonite sheets are used, formulated to withstand constant contact with groundwater and the static puncturing of soil during backfilling. Swimming pools and containment tanks, on the other hand, require epoxy or cementitious products suitable for permanent contact with chlorinated water.

Handling this product category requires attention to storage temperatures and the shelf life stated by manufacturers, especially for water-based resins and emulsions, which are irreversibly damaged by frost. For the builders' merchant, the real commercial advantage lies in offering complete application systems. It is essential to supply professionals not just with the resin or mortar but with the entire package: adhesion-promoting primers suited to the substrate, fibreglass reinforcing mesh and rubberised tapes for treating joints. Clear display principles, such as those of Progetto Rivendita 2.0, make cross-selling with dedicated tools (floats, rollers, mixers) easier. This targeted advice allows retailers to support contractors even with complex structural problems such as rising damp, offering injectable silane chemical damp-proof courses or macroporous dehumidifying plasters for the permanent restoration of masonry.