Exterior Below Grade Waterproofing

Franc February 09, 2021

Plywood exterior Exterior below grade on masonry concrete and incidental metal Above grade between two-course concrete and within cavity walls. Below grade moisture tends to migrate from the damp soil to the drier area inside the basement.

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Cover all below-grade lumber with a moisture barrier.

Exterior below grade waterproofing. Waterproofing concrete below grade How to make good drainage work together with good materials to keep the basement dry BY BRENT ANDERSON PRESIDENT BA ASSOCIATES INC. Ames Blue Max is a special blend of adhesive high strength elastomeric liquid rubber. Below-grade ICF walls require a waterproofing membrane and depending on soil conditions a reliable drainage system to reduce the possibility of moisture intrusion from soil and water.

Below Grade Waterproofing SOLUTIONS FOR EVEN THE MOST CHALLENGING REQUIREMENTS Sika provides solutions for even the most challenging requirements with its unique waterproofing product portfolio contributing to efficient long-lasting infrastructure be it for drinking water facilities fulfilling the most stringent drinking water approvals tunnels bridges basements or balconies. Protecting below-grade walls from water entry involves installing a barrier to water and water vapor. MasterSeal HLM 5000 is a one-component moisture-curing bitumen-modified polyurethane elastomeric waterproofing membrane for exterior below-grade or between-slab applications.

It is a new impenetrable rubber technology for waterproofing in extreme wet situations such as below grade foundations basement walls and a base coat for certain roof types. Our exterior waterproofing products include channel drains drywells and surface drains. Lap the joints by 6 inches and seal with manufacturer-recommended adhesive.

Ideal for below-grade waterproofing applications such as foundation walls tunnels and earth shelters ICFs and similar structures. TAMKOs below-grade system consists of a 60-mil thick self-adhering rubberized asphalt sheet membrane primer and mastics. An impervious barrier on the exterior wall surface can prevent moisture entry.

Sub-Surface Drainage Below grade waterproofing is a vital system when trying to keep water from entering your home. In new construction using CMUs we recommend a fiber-reinforced cement applied at 18 for permanent protection. Self-adhered or peel-and-stick waterproofing membranes are common below-grade waterproofing systems used for ICF foundation walls.

If the exterior wall materials will not protect the waterproofing at grade base flashings should be used to protect the waterproofing from ultraviolet UV radiation. For existing structures the choice is to address the problem from the outside by adding gutters changing pitch of surrounding. In addition to these consider drainage boards or footing drains.

Once you successfully apply below grade waterproofing to your home or building youre going to need assessment on whether youll need drainage. Water seepage through below grade walls can be an expensive problem to solve. French drains are often used as are under-slab drainage systems.

Sump pumps are also a must if the area is completely flat. Your waterproofing team can analyze this for you to weigh the options. Apply 6-mil-thick polyethylene sheeting or a self-adhesive waterproof membrane to the entire exterior side of the below-grade walls before backfilling.

Prevent water intrusion into buildings that have limited access and limited ability for excavation during construction and are adjacent to an existing structure or property line. The elements of an adequate waterproofing system are surface grading complete subsurface drainage and a waterproofing membrane bonded to the exterior of the wall. Where grade slopes down along an exterior wall the waterproofing membrane will step down incrementally so that it continues to protect the below grade occupied space.

Almost all below-grade waterproofing projects will have either a protection layer board to protect against possible damage from backfill operations or a drainage solution to manage the water away from the waterproofing membrane. Some drainage solutions can protect both the membrane and manage the water. A factory-applied fabric allows water to pass into the drain core while restricting the movement of soil particles which might clog the core.

Poly Wall Arroyo Drain Board is a sheet molded drain that establishes predetermined pathways for below-grade water management.

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