Weepholes shall be provided in the outside
Weep holes shall be provided in the exterior wythe of masonry walls and shall be at a maximum spacing of 33 inches (838 mm) on center (o.c.). Weep holes shall not be less than 3/16 inch (4.8 mm) in diameter.
Therefore, weep holes are at the bottom of brick veneer, just above the top of the foundation, and directly above the termination point of any flashing installed behind the brick. Weep holes also should be located above doors, above and below windows, and above any other openings in the brick wall.
As an alternative to weep holes, most new construction will connect the drainage zone to a perforated drainage pipe located behind the base of the wall outfalling to a manhole.
Even if you used the code as a basis of the requirement for weep holes, you would be surprised to learn that weep holes were nor mandated in the single family code until 1983 CABO, mandated by the 1985 Kentucky Building Code. Home inspectors are calling out missing weep holed on house built before 1985.
Yes, Australian building codes mandate weep holes in masonry to ensure proper drainage and ventilation, safeguarding structural integrity and preventing moisture-related issues in buildings.
Without masonry weep holes, or if the existing drainage system is blocked or broken, capillary action can result in the water becoming trapped inside the cavity wall.
If your building does not have flashing to protect against water, or weep holes to let it escape, its susceptible to water damage and possibly mold.
It is difficult to add weep holes after the walls are constructed. If the weep holes are drilled, they will typically puncture the flashing. This is true even if a special guide is placed on the drill. If the hole does not go all the way through the mortar then it will be ineffective.
The Weep Vent should be spaced at no greater than 900mm centres to meet N.H.B.C guidelines, which state, “weep holes are recommended to be sited at every 450mm maximum with at least two per opening above all windows and doors.”
Blocking your window weep holes predisposes the window structure to water damage, rust, and corrosion ultimately reducing your window's lifespan.
As a general guide weep holes at floor level should be a minimum of 75mm above finished ground levels.
“Any cavity wall definitely needs weep vents,” explains David. “They have a gap between the outer and inner brickwork that can trap water from where the temperature inside the building is different to the outside.”
Gravity draws water to the bottom of the wall, just above the foundation, where weep holes allow it to escape. They are located above all windows, doors, and other openings. Weep holes are also located on window tracks.
Functionality: Whether tile insert drains contain weep holes depends on the specific design and intended use.
Weep holes are typically found in the outer masonry leaf of cavity walls, just above the flashing. They can also be found above windows, doors or other penetrations. They should be provided at regular intervals so as to allow any moisture collected by cavity trays to escape.
Weepholes shall be provided in the outside wythe of masonry walls at a maximum spacing of 33 inches (838 mm) on center. Weepholes shall be not less than 3/16 inch (5 mm) in diameter.
Weep holes can be added after the wall is constructed by drilling through the wall thickness.
Quality weep hole covers are the best way to protect these openings while maintaining their functionality. They are designed to allow air and water through while at the same time preventing debris, pests, and embers from entering.
Mold growth and accumulation in non-visible areas.
Because brick masons know that bricks can take on water, they plan for a way to allow bricks to release the water. Weep holes are very important for preventing these other nasty moisture and mold issues from causing problems for your home.
Problems With Weepholes
If weep holes are left unprotected in brick walls they provide access to the wall cavity for rodents and insects. Swarming bees and European Wasps love creating nests in cavities.
It's obvious that small pests such as cockroaches and spiders can crawl through weep holes, but vertebrate pests such as lizards, snakes and even mice can also squeeze through a normal weep hole.
Weepholes shall be not less than 3/16 inch (5 mm) in diameter. Weepholes shall be located immediately above the flashing.
Why are there no weep holes? The reasons vary, but the house's builder forgot to include them, or the homeowners didn't want them. Sometimes homeowners don't want weep holes because they retract from the house's appeal – think smoothly rendered brick houses.
Weep holes are often located at the bottom of brick exterior walls. They look like vertical gaps in the mortar joints between bricks. Because brick masonry is porous, water may penetrate the surface and get behind the wall.