HIDROSTAN® References for waterproofing firefighting tanks

Waterproofing inside the containment tank with Hidrostan EPDM membranes

One of the most important problems that builders face when constructing underground concrete water tanks is waterproofing.

Ensuring that there are no water leaks from the tank or water infiltration from the surrounding soil is one of the main concerns for those who build concrete tanks, because they must withstand the negative pressures that develop when the tank is emptied or filled, and combat the forces that come from the rising water table and the surrounding soil.

Fire protection systems, also known as active fire protection systems, consist of a set of components, including internal waterproofing with Hidrostan EDDM waterproofing membranes.

Thanks to their reserve water supply, fire tanks provide peace of mind and protection against disasters. In areas of the country where water use is restricted during droughts, water reserves can also be used for lawn irrigation. A green lawn reduces the risk of fire.

Creating durable waterproofing for a concrete firefighting tank is one of the most complex challenges in the construction industry.

The use of membranes in EPDM Hidrostan® is a highly effective and reliable solution to these critical issues. Thanks to their high flexibility and resistance.

Before installing the Hidrostan® EPDM waterproofing membrane, check that the substrate conditions are suitable. To ensure lower tensile stress on the membrane, allow for at least 2% in length and width compared to the drawings.

Thoroughly clean the concrete floor and walls and use a TNT fabric before laying the membrane.

Position the Hidrostan® EPDM waterproof membrane according to the installation diagram provided, securing it mechanically using anchors at the top of the tank, aligning the sheets, avoiding tension, and allowing it to rest before fixing.

After positioning the sheets, proceed to fold the edges. The edges where the membranes meet should overlap by approximately 10 cm so that the areas in contact with each other are ready for bonding.

The overlapping areas must be completely clean and dry, and on both sides of the overlap, apply a layer of AC-221 adhesive 8 cm long on each side . On the remaining 2 cm , apply Mastic Sealant (SMP). Use a roller or brush to apply the adhesive. Once AC-221 Adhesive has been applied to each side of the overlap, allow the solvent to evaporate for about 15 minutes, until the adhesive is no longer sticky to the touch.

Once the solvent has evaporated, fold the top sheet over the bottom sheet, completing the overlap, so as to avoid wrinkles or air pockets, and apply the Mastic Sealant (SMP).

To avoid the formation of wrinkles and air pockets, we recommend using a smooth, heavy roller (steel), pressing it firmly first in the transverse direction and then lengthwise.