One of the most interesting questions in the waterproofing sector is “what is positive side” waterproofing or “what is negative side” waterproofing.
Positive side applied waterproofing is an external waterproofing system. A waterproofing system installed to the exterior face of the below ground structure. It can protect the structure and the interior against the effects of moisture and pressurized water.
One of the primary advantages of positive side systems is that water is prevented from entering the substrate surface. The substrate is also protected from freeze-thaw cycles, and corrosive chemicals in the groundwater.
One of the disadvantages of positive side waterproofing is that the system is inaccessible for repairs after the installation. This means that costly removal of concrete, landscaping, grass, dirt etc.
Negative side applied waterproofing is applied to the internal surfaces of the structure. An internally applied system is as good as the sum of the integrity of the structure and the preparation undertaken.
It is used primarily for water holding purposes and prevents the water from entering the occupied space. The primary advantage of negative waterproofing is that the area is fully accessible after installation and requires no surface removal or intrusion to the substrate. Negative side waterproofing does not provide protection from freeze-thaw cycles.