Windows & Doors
Week 7 Detailing for Heat and Moisture Drainage Walls Overview, Prevent water from flowing through roof sheeting panels Basement and expanding and contracting of gutters to be designed for this. Moisture penetration points Rood$ing Figure 1: Moisture Penetration Points • Water can enter through gaps and splash-‐back from hitting another object. Strategies for stopping water from entering • Remove openings: However if openings cant be removed, Waterproofing can be done by using sealants such as silicone or gaskets made of artificial rubbers. These are both flexible and waterproof materials that can allow for tolerances that cause unplanned openings. These materials wear out and need to be maintained. • Keeps water away: Eves, sloping roofs and roof/wall flashings can do this. Overlaps can be used to on tiles, roof sheeting and weatherboard cladding systems, this works by allowing water to slope away from the building. • Neutralize the forces that move water through openings: The forces consist of gravity, momentum, surface tension and air pressure. Again slopes and overlaps with double cavity brick walls with a membrane and flashing allowing moisture to flow out. At doors there are thresholds and a sloping pavement to direct the flow away form the door. Only a 1% slope is needed and it will prevent water penetration. Capillary action can be broken with gaps and openings which prevent the flow of water and hence water entering. • Air barriers are used to prevent the problems of air pressure, with the tendency for water to be pumped in to the building.