The Ultimate Guide To Polyurethane Waterproofing Membrane

It is important to protect certain spaces and places from water and moisture. This is why polyurethane waterproofing membranes are essential. This is a substance that is used to seal a structure from water or moisture penetration. This makes the particular structure reliable and safe for habitation. Moreover, this waterproofing membrane helps in saving funds that would have been used to repair the damaged parts. This waterproofing membrane consists of two main substances, i.e., reactor and base. The substance ‘Polyol’ is the base and the substance ‘Isocyanide’ is the reactor. These two substances are mixed in a specific ratio to create a liquid substance that is used for waterproofing.

There are several places where polyurethane waterproofing membranes can be used. These places include; roofs, pools, fountains, floors, balconies, channels, kitchen, bathroom, among other places. 

Procedure Of Applying Polyurethane Waterproofing Membrane

While applying polyurethane waterproofing membrane, there is a specific procedure that should be carefully followed. These are the particular steps that should be strictly followed.

Step 1 - Clean the surface thoroughly to ensure that it is free of any dirt or foreign substances that might hinder the waterproofing membrane from working effectively.

Step 2 - If the particular surface has any cracks, they should be cut into a V shape. They should be cleaned and filled with polyurethane base crack filling compound and white cement at the ratio of 1: 2.

Step 3 - Apply some acidic substance on the particular surface. This will work to remove alkalinity thus neutralizing the surface.

Step 4 - Apply two packs of a polyurethane primer coat on the surface. This will serve as an adhesion coat and should be left to dry for at least 8 hours.

Step 5 - Apply three successive finish coats each with 2 elements of the polyurethane waterproofing membrane per the ratio specified and let each coat to dry for at least 12 hours before applying the next finish coat.

Step 6 ; Ensure that the polyurethane coating is applied for 150mm on the walls or parapets and should be applied up to 100mm on the rainwater pipes. 

Step 7 - Finally, sprinkle some 300 microns of sand on the final polyurethane waterproofing coat. 

This is the procedure of applying polyurethane waterproofing membrane on a damaged surface. Moreover, there are several characteristics of polyurethane that should be well understood before using it.

Characteristics Of Polyurethane Waterproofing Membrane

The waterproofing membrane is eco-friendly because it does not contain any benzene solvent or coal tar. Hence, it is also safe for human beings and does not pose any particular health risks.

The polyurethane waterproofing membrane is easily applied because no heat is required in the application process. Polyurethane has a quality adhesive coating that strengthens the damaged surface. These unique adhesive properties make polyurethane a very effective and efficient waterproofing material.

Polyurethane waterproofing membrane has a great tensility capacity that enables it to withstand extreme temperatures. Moreover, these tensility properties give it exceptional stretchability, good anti-shrinking ability, resistance against surface fracture and a low rate of deformation.


While constructing structures, it is important to remember that they can get damaged. Hence, it is good to have polyurethane readily available. This will ensure that the particular damaged surface gets repaired effectively without delay.


Anonymous comments are disabled in this journal

default userpic