Because of the intense weather conditions that it is exposed to every single day, the roof’s lifespan often gets shorter. While most roofing materials can last up to 20 years, there is still a chance that a homeowner might need to spend a hefty sum to replace their overhead protection a bit earlier, particularly if the roof has been exposed to excessive moisture.
Because of this, many roofing contractors recommend applying waterproofing sealant to the structure’s surface to shield the roof itself from torrential rain, excessive snow, as well as intense heat. Aside from that, experts revealed that waterproofing also comes with other benefits as well, including increasing the roof’s resistance to fire, preventing mold growth, and reducing heat absorption and cooling expenses.
Types Of Waterproofing Techniques
Contrary to popular belief, there are several types of waterproofing that can be done for the roof. In fact, experts revealed that there is a specific waterproofing technique that is suited best for some roofing materials used in many houses all over the world.
The cementitious waterproofing method is considered as the easiest waterproofing method in construction because the materials needed for this technique is readily available and can be prepared and applied effortlessly with the help of a long-handled brush.
While this method is commonly used in internal home areas that often get wet (e.g. bathroom and kitchen), it has also been used in houses with flat roof decks that are made of cement. However, experts explained that this waterproofing strategy is typically rigid or semi-flexible, so it may not do well with even the smallest cracks.
Liquid Membrane Waterproofing
This kind of waterproofing method entails spraying coats of liquid that cures into a rubbery coating. Typically composed of a primer coat followed by two of top coats, the liquid membrane waterproofing method allows more flexibility compared to the cementitious method. It is also known to be easy to apply provided that the worker utilizes a spray, roller, or trowel. It is also relatively cheaper and can cover a wider portion of the roof because of its elongation.
Unfortunately, it doesn’t come without disadvantages as inexperienced contractors tend to apply it inconsistently and may not even meet the required 60 mils thickness for it to achieve its efficacy.
Bituminous Membrane Waterproofing
The bituminous membrane waterproofing method, also known as sheet membrane waterproofing, involves applying self-adhesive sheets usually made of asphalt, polymers, and filler to the roof. Sometimes, manufacturers add resins and oils to the mixture to increase its adhesion characteristics. As a result, it looks like rubberized asphalt that is laminated into a waterproof polyethylene film, making it an excellent waterproofing material.
Experts witnessed how effective these 60-mil-thick membranes are for buildings with low-sloped roofs. It is also recommended for small repairs and patch-ups as it can easily cover the damaged areas. However, they do not recommend it to be installed by inexperienced contractors as the adhesive part of the sheets usually stick to almost everything, making it difficult to align.
While it can be expensive, it promises consistent thickness compared to the liquid membrane waterproofing technique and minimizes quality control risks.
Polyurethane Liquid Membrane Waterproofing
The polyurethane liquid membrane waterproofing method is known an expensive but effective technique to protect a building or house’s flat roof area from extreme weather. It also offers more flexibility than other waterproofing systems, has a seamless finish, and can be easily installed. Because of this, it became a popular choice for many construction companies and their clients as it is also deemed to have a longer lifespan.
Other advantages of this kind of waterproofing method include resistance to harsh substances like battery acid, alkaline cleaners, and fuels; high resistance to wear; and UV protection. However, some believe it requires expert application since it is highly sensitive to moisture content. Failing to do so might lead to debonding of membranes and peeling.