Build Science #7: Water Management

Understanding Water Management

1. The Fundamentals of Water Management

In building science, water management is paramount. Water, in its various forms, is the primary cause of building deterioration. Our objective is to control water interaction with our structures, preventing potential damage.

2. Key Terms in Water Management

• Protection: This involves designing buildings to minimize direct water exposure, using overhangs, appropriate roofing, and other architectural features.

• Mitigation: This focuses on giving water a defined path to follow, ensuring it doesn't penetrate the building envelope. Effective mitigation involves the correct installation of sidings, windows, and doors.

• Prevention is the last line of defense, where we employ barriers like weather-resistant barriers (WRBs) to stop water from infiltrating the building's critical components.

Implementation Strategies

1. The Role of Aspect Ratio

The aspect ratio in building design refers to the relationship between the overhang distance and the point of water entry, like the top of a window. An ideal ratio is 2:1, providing substantial protection against water infiltration.

2. Importance of Proper Installation

It is crucial to ensure proper installation of windows, doors, and other components. This involves understanding the difference between barrier methods and water-managed systems. A water-managed system acknowledges the potential for leaks and creates pathways for water to escape.

3. Groundwater Management

Particularly in basements, managing hydrostatic pressure is vital. Using waterproofing techniques, protection boards, and proper drainage systems can prevent water from damaging the foundation and interior spaces.

Practical Applications

1. Rain Screen Systems

Employing rainscreen systems provides an additional layer of protection. This involves creating a gap between the exterior finish and the WRB, allowing water to drain away effectively and minimizing direct impact on the building envelope.

2. Addressing Capillary Action

Capillary action can draw water into materials like concrete or brick. Breaking this capillary action with methods like sill sealer or capillary breaks can prevent moisture from wicking up into the building structure.

The Role of Building Science in Water Management

Building science offers us the knowledge and tools to design and construct buildings that effectively manage water. By understanding and applying these principles, we create structures that withstand environmental challenges and stand the test of time.

Looking Ahead:

In our next blog post, we will explore the critical aspect of Airtightness in building science. Understanding how to manage air movement in a structure is key to energy efficiency, comfort, and the long-term durability of the building.