Over Applied Waterproofing is a crucial aspect of construction and building maintenance, designed to prevent water infiltration and structures from moisture-related issues. Just like insufficient waterproofing can be problematic, overapplying waterproofing can also lead to problems, such as early renovation or higher expenditures.
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Reduced Breathability
One of the primary consequences of overapplying waterproofing materials is reduced breathability. Building materials (in contact with ground) need to allow some degree of moisture vapor to escape. This is essential for regulating indoor humidity levels and low amounts of condensed particles.
Excessive waterproofing can lead to various problems like:
Condensation
When trapped moisture has no way to escape, it can condense on cold surfaces, leading to mold growth and structural damage.
Material Degradation
Over time, excessive moisture can lead to the degradation of building materials like wood, drywall, and insulation, causing structural damage and reduction in the structure’s useful life.
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Loss of Flexibility
Most waterproofing materials, especially liquid-applied membranes and sealants, are designed to be flexible and temperature-adaptable. However, when overapplied, these materials become rigid and replaceable. Some of the consequences are:
Cracking and Delamination
Rigid waterproofing materials are likely to crack and delaminate upon movements. This action compromises the integrity of the waterproofing system, allowing water to infiltrate the structure.
Costly Repairs
Restoring flexibility to overapplied waterproofing can be expensive and time-consuming, requiring removal and replacement of damaged materials.
Increased Cost
Overapplying waterproofing materials can have a significant financial impact on the project. Excess materials translate to higher material costs, with added labor increasing the overall construction cost. The maintenance costs also increase down the road.
Reduced Drainage Efficiency
In some situations, especially in roof and foundation works, overapplying waterproofing materials can hinder drainage systems. With excess application, drainage pathways are obstructed, causing water to pool or accumulate and cause various problems, such as:
Ponding
On flat or low-slope roofs, overapplied waterproofing can cause water to pond, leading to structural damage.
Water Seepage
In below-grade applications, such as basements, overapplied waterproofing can prevent water from draining properly, leading to water seepage through walls or floors.
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Environmental Impact
Excess application of waterproofing materials can have environmental implications. Most waterproofing products are manufactured using various chemicals and processes, which can contribute to environmental degradation and pollution. Overapplication results in higher wastage and disposal costs. Moreover, it increases the carbon footprint.
Difficulty in Future Repairs
It can be challenging to make future repairs or modifications to the structure after overapplication. The rigid and excessive layers of waterproofing need to be removed, which can be time-consuming and costly. Additionally, this process may damage the underlying structure, further complicating repairs.
Disadvantages of Excess Waterproofing Membrane Application
Overapplying waterproofing membrane can lead to several disadvantages: Excessive application can result in more thickness than desired, leading to issues like poor adhesion, cracking, and delamination. Furthermore, application of excess waterproofing materials is costly and wasteful, both in terms of the product itself and the labor required. It can also hinder future maintenance or repairs, as removing the excess material can be time-consuming and challenging. Additionally, overapplied membranes can affect the aesthetic appearance of surfaces, creating an uneven or unattractive finish.
Bottom Line
To avoid the detrimental effects of overapplied waterproofing, it’s crucial to strike a balance between adequate protection and proper moisture management. Consult with experienced architects, engineers, and waterproofing professionals to ensure that waterproofing is applied to the right thickness and in the correct areas to meet the specific needs of your project. Follow manufacturer’s guidelines and industry practices to achieve the desired waterproofing performance.
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