Second, while effective at blocking the migration of moisture through concrete, they are not capable of blocking the passage of water that is under hydrostatic pressure. Bentonite clays act as waterproofing by swelling when exposed to moisture thus becoming impervious to water. All core joints and terminations must be covered by fabric overlay. Basic Uses TREMDrain NW is ideal for vertical walls less than 20 feet. Isolation, insulation and waterproofing of certain piping that undergoes large temperature changes are often underestimated for resulting movement. Insulation Project Guide. For foundation wall applications, typical cold applied fluid applied systems are approximately 60 mils in thickness. Apply 6-mil-thick polyethylene sheeting or a self-adhesive waterproof membrane to the entire exterior side of the below-grade walls before backfilling. The sealant is pushed through the entire depth of the crack to plug leaks effectively, Stock said. The UGL Drylok Extreme is not. Attach mat to membrane surface with Sikaflex 11FC or approved adhesive as necessary to keep in position. 9 0 obj endobj Hammer & Hand uses essentially the same procedure. Generally, waterproofing can only be eliminated in sites with exceedingly dry soil. endstream They can be applied with a sprayer or with a brush, and in many parts of the country thats all the foundation walls will get in the way of moisture control. With fluid membrane systems, proper application in terms of coverage and thickness is critical to performance, and this should be monitored throughout the installation. Styrene-butadiene rubber compounds cure to a flexible, rubbery consistency. Lateral loads on foundation walls exist from the soil, surcharge and hydrostatic pressure loads. Foundation drain is an exterior drainage system installed on the outer face of the foundation wall and near the wall footing, covered with a layer of gravel, serving the purpose of draining out excess water seeping into the foundation. The four function categories, i.e. One potential disadvantage is the inability of some liquid products to span cracks or opening of construction joints, which may occur on new buildings soon after application. The use of a Tremco drainage mat provides the following advantages: 1. The product is packaged in a 39 in (990 mm) by 250 ft (76 m) roll and is approximately 1/8 in (3.2 mm) thick. With enough of a hydrostatic head, water will be forced up through the slab even if the walls are watertight. Become a member and get unlimited site access, including the Woven products are constructed using individual threads or filaments and have good strength and stiffness; however, the material can be penetrated by angular aggregate reducing the ability to properly filter or separate fine elements. 30 to No. Areas designed as pedestrian areas should also include consideration for emergency vehicular loadings. Revised by the Chairs of the Building Enclosure Councils with assistance from Richard Keleher, AIA, CSI, LEED AP and Kenneth Roko, AIA of The Facade Group, LLC Fluid-applied membranes are applied in liquid form and cure to form one monolithic seamless membrane. 4. Structural Support FunctionsThe foundation wall system of the below grade building enclosure must be designed and constructed to support both vertical and lateral loadings. This area should also be properly vented. Repairs from the outside involve digging a trench on the outside of the foundation, adding perimeter drains if they do not already exist, and adding dimple mat or another type of membrane to the outside of the foundation wall. In many cases the foundation wall is required to resist all of these loads directly with the wall designed as a cantilever retaining wall with a large base footing or as a basement wall spanning vertically between the foundation element and supported floors. Generally, the people you find putting money into new construction waterproofing, whether its residential or commercial, are those who have either been bit before because theyve owned another home and it leaked, or they have a very conservative architect or builder whos going to tell the homeowner the truth.. The first area is the finishes of the interior space. Figure 2 is an overall schematic that characterizes the four functions i.e. The fabrics are available in various forms including non-woven for clay type soils and woven or small opening geotextiles for sandy or high-silt type soils. National Institute of Building Sciences of standing water is equal to 250 pascals, the same as a 70-mph wind. Many waterproofing membranes need to be shielded from ultraviolet radiation to prevent deterioration and as such some type of exterior finish is required. Positive drainage should be established underneath structural slabs with crawl space. It can be applied to a wet wall. Therefore, a protection layer is recommended between the waterproofing membrane and the drainage layer. Builders will have to move up to a true waterproofing material when site conditions include a high water table, or when taking extra precautions against water intrusion. Since dampproofing cannot withstand hydrostatic pressures, it should not be used on structural elements below the water table where the intent is to prevent interior water leakage. Green Roof Drainage Mat - EnkaDrain 3811. Thickness; 1/4 " 3/8 " 13/32 " 7/16 " 1/2 " 9/16 " 5/8 " 3/4 " 7/8 " 1 3/4 " Mat Type. The TREMDrain is used with TREMproof and Paraseal waterproofing membranes serving both as a protection course and replacement for traditional pipe and stone drainage systems. As moisture moves from the upper screen through the drainage system on the exterior towards the exit drain, moisture will inevitably make its way toward the surface of the foundation wall itself. Backfilling should commence as soon as possible after installation of the drainage mat. Thats s no longer the case. Waterproofing resists both vapor migration and hydrostatic pressure. Bentonite panels are still common on commercial waterproofing jobs, says Geiger, and remain popular with some architects and builders. Portions of the building permanently below the water table may require more redundant systems. Hammer & Hand, the design/build company in the Pacific Northwest, recommends in its Best Practices manual a liquid-applied elastomeric membrane directly over the concrete, followed by drainage mat with integrated filter fabric. 3. Drainage mat for foundation wall Air sealing is critical. Xypex balked at Peters test method, arguing that CMU blocks differ too much in composition to allow a reliable seal. Commercial. With some coaxing, the two crystalline coatings did keep water out. The latter two should not be used as waterproofing except for the most non-critical conditions. Although liquid-applied membranes are seamless, their potential weakness is inconsistent application resulting in uneven thickness on the concrete. tb{g{x%s6FYi3i0SYEp14SQ>=Fu6{MCSpxn+wl>#m}/XZ2K.dham^EmZs~WbxfDq*-LR%w~n \,|u@Q( =LsDiNcjpuC#8]mKM1 `9{w-CYi?=]) K_4P}L+3Bb V;=zlWlxzjf ^eWS$hR2E~=ss!e11|. Good water management practices like . Because of the unique nature of penetrations and Special Features, no single rule or criteria can govern or apply to the effective treatment thereof. The entry level of good performance, as Straube puts it, would consist of a drainage membrane like dimple map plus a perimeter drain at the base of the wall. After waiting two weeks and retesting, Peter found no water leaks at all on the column. Materials used may be concrete or reinforced masonry. This is called spalling. Condition appraisals and trouble shooting of below-grade structures reveals common sources of leakage that occur at penetrations. In fact, in some situations, conditioned below grade spaces are subjected to a constant inward vapor drive during summer as the interior space is air conditioned, and in the winter the interior space is heated resulting in a lower vapor pressure than the exterior condition as the soil stays relatively constant in terms of vapor pressure. Get home building tips, offers, and expert advice in your inbox. Drainage board, such as Drkens Delta-Drain, is similar to dimple mat except that the dimples face outward and are covered with a layer of geotextile material. (51 mm) PVC pipe at 8 ft (2400 mm) on center, allows water on the interior to reach the foundation drain. Expert advice may also be necessary when dealing with field conditions. All rights reserved. Drkens version is called Delta MS. For codes/standards refer to General Overview section. Drainage mat can be fitted with outlets and drainage accessories to further move the water away from the structure. In a technique called curtain wall injection, a series of holes is drilled all the way through a foundation and a sealant is pumped into the soil surrounding the wall or slab to create a waterproof barrier. WaterWay Rainscreen Drainage Mats: Consists of a polypropylene core of fused, entangled filaments in varying thicknesses from a nominal 1/8 inch to 3/4 inch, depending on desired cavity space and cladding selection. Sewer pipe penetrations, water line entry penetrations, drain basins in the floor slab or sleeves for electrical, gas or communication are all common penetrations, typically with their own design or detailed features. DELTA-MS is a dimpled membrane that uses our exclusive Air-gap Technology to ensure your basements stay dry and last longer. Imperfections in the sprayed coat are repaired or filled with the sealant (Risinger recommends Poly Wall 2200). Store properly in original, unopened, undamaged sealed packaging in dry conditions, flat and wrinkle free at temperatures between 40 F and 95 F (435 C). Drainage boards cover the foundation from the ground level to the top of the footing. The code permits a variety of waterproofing materials (even rolled roofing), but the most common for residential work are probably liquid-applied and peel-and-stick sheet membranes. Dimple mat, or dimple board, is a product that seems to fall somewhere in between simple asphaltic dampproofing and a full-on waterproofing membrane. These details must be properly detailed and installed to be effective. The Foundation Protection System that Keeps Basements Dry Protecting your foundations from water and moisture is critical. Contractors have successfully used daubs of the Tremco membrane originally used to waterproof the foundation. Contents: [ show] Components and Working of Foundation Drain Water that makes its way past the face of the sheet should make run down to perimeter drains at the base of the wall without hydrostatic pressure that would cause problems. The effectiveness of this initial screen in shedding moisture may influence the design of the other components of the system. For resources including texts, guides, and web pages refer to General Overview section. But, he adds, just as water makes the bentonite swell, a lack of water makes the panels shrink. In stock and ready to ship. A variety of sheet- and liquid-applied membranes can be used, all designed to resist the hydrostatic pressure of ground water. Other surfaces such as gas pipes, signal or electrical should generally be done with due consideration for the nature of the sleeve through the exterior wall and the depth below grade of the penetration. Sika Drainage Mat GRS Sika Drainage Mat GRS for vegetated roof assemblies consists of an impermeable dimpled polystyrene drainage core. However, classification of common penetration types and features helps to ensure effective treatment and proper function. Abrading & Polishing; Building & Grounds . Drainage pipe at the perimeter of the foundation wall should be surrounded by a free draining granular material that is wrapped in filter fabric to prevent fines from filling in the porous spaces of the granular material. Waterstops should be utilized at construction joints in below grade walls, footings, slabs, and other elements where a waterproof system is required. The location of the building will inform (1) the amount of drainage provided and (2) the amount of insulation in the assembly. The integration of the two systems requires careful consideration to insure that all moisture, air and thermal criteria for each system are satisfied at the transition interface. Asphaltic coatings may be solvent- or water-based. The core is installed dimpled side down to allow water retention within the cups. A protection course is a puncture-resistant material designed to minimize or prevent possible damage to the waterproofing membrane prior to or during concrete pour and backfilling. Thickness Drainage Mat 420/720 Drainage Mat 1000 Drainage Mat GRS 0.40'' 0.25'' 1.0'' (ASTM D-1777) TECHNICAL INFORMATION Other materials sometimes used as protection layers are extruded polystyrene rigid board insulation or prefabricated synthetic drainage layers. Hot applied, rubberized asphalt systems can be 125 mils to 180 mils thick, plus embedded 60 mil neoprene sheets. . An interior drainage layersuch as dimple mat or sheet waterproofing membranecan be added. The information contained therein is not intended for actual construction, and is subject to revision based on changes and or refinements in local, state, and national building codes, emerging building envelope technologies, and advancements in the research and understanding of building enclosure failure mechanisms. Waterproofing is more effective in eliminating the risk of leakage and may be no more expensive than dampproofing, depending on the material used. %PDF-1.7 Multi-Composite Drainage and Protection Boards TREMDrain Total Drain is designed provide a value engineered alternative to perforated pipe and aggregate subsurface drainage systems in applications requiring high strength and high flow capacity. In areas with greater moisture loads from hydrostatic pressure from high water tables or sensitive interior environments, a waterproofing membrane should be applied to the exterior surface of the foundation wall in lieu of dampproofing. The liquid is the carrier, says Russ Snow, sales manager and product group manager for W.R. Meadows, but the products are essentially the same once the liquid has evaporated and the coating has cured. The slip plane can reduce stresses imposed on the membrane during controlled backfill operations; these stresses can cause membrane damage, wrinkling, loss of adhesion, or delamination. It is used for drainage, protection, filtration, and hydrostatic pressure relief. This can be handled from the outside (positive side repairs) or from the inside (negative side repairs). BROWSE CATALOG. If Bentonite clay is unconfined, it can shrink upon drying, creating gaps that undermine waterproofing characteristics. Common knowledge suggests that the seals serve as a back-up function and that avoiding moisture build-up is the principle objective for obtaining a leak free building at penetrations. Two weeks later, the column was showing a very slow seepage of water near the bottom of the column. Theres one thing to keep in mind when using a waterproofing membrane on the foundation walls, Straube says. Common materials include polyvinyl chloride (PVC), neoprene, expanding sodium bentonite and thermoplastic rubber. Moisture control is dealt with in a multiple screen/barrier type of design approach. Although thats still a common approach for dampproofing foundations, builders also will find a range of other products, from peel-and-stick waterproofing membranes to liquid-applied synthetic rubber designed to span cracks in the concrete that are bound to develop in time. Sika Drainage Mat 1000 Sika Drainage Mat 1000 consists of a high density polyethylene geonet drainage core with its ridges heat fused to a layer of nonwoven polypropylene filter fabric on the top side and a heavy duty non-woven polypropylene membrane protection fabric on the bottom side. The sump basin is always capped with a lid that is vapor and air tight. concrete or concrete masonry units. In soils that go through repetitive wetting and drying cycles, the panels eventually show signs of wear and become less effective than if they had stayed wet all the time. The foundation wall of a building may be a cast-in-place concrete retaining or basement wall or a structural wall complete with load-bearing pilasters. For example, crystalline waterproofing is often used to provide redundancy to one of the other waterproofing systems. Although not as common, pre-installed permeable grout injection waterstop may also be considered. Backfilling with native, poor draining soil is not recommended as this will maintain an active water load on the foundation wall and limit its ability to control moisture ingress to the interior. Where sheet materials are utilized, it is preferred to adhere the membrane fully and continuously to the substrate to prevent lateral migration of leaks, and to heat-weld or positively bond the seam laps. What is the minimum thickness of mat foundation? If you are unsure what level of protection is right for you, please contact us. In general, the manufacturer's standard details should be followed. Drainage mat is principally designed to reduce hydrostatic head pressure and direct water to a perforated drainage system. If PVC is used, corners and laps should be heat welded and properly inspected. Asphaltic protection boards are available in 1/16, 1/8 and 1/4 inch in thickness. With these softer waterproofing membranes protection board is recommended under the synthetic drainage layer or drainage layers with integral polyethylene backing may also be appropriate. Waterstops are manufactured products available in a wide range of configurations and sizes. Even in parts of the country that dont have a high water table or get much rain, dampproofing is required by the International Residential Code (section R406.1). Dampproofing resists the passage of liquid water that is not under hydrostatic pressure, which is the case when the foundation is backfilled with a well-draining material and is not subjected to standing water. As most foundation wall systems have substantial mass, e.g. However, the use and location of the insulation is more important on the control of moisture in terms of preventing condensation on interior wall faces for the entire height of the foundation wall. 8 sieve are suitable. If adhesives are used to attach an element to the membrane, the adhesive pattern should be installed in small dabs to allow vertical water discharge and reduce the potential for hydrostatic pressures imposed on the waterproofing membrane. The removal of the moisture in the most complete and expeditious manner will decrease the probability for intrusion of water. This cooling effect combined with general poor air circulation in underground spaces can result in condensation on interior wall surfaces. Combining different moisture control layers is popular with a number of builders. 5. For uneven rubble foundations, a layer of spray foam insulation can be applied over the waterproofing membrane, as the illustration below shows. In many foundation wall situations with low water table elevations, the combination of the upper screen, the exterior drainage system, the near surface drainage system and the exit drain will control the majority of the water. These are EnkaDrain foundation drainage mats. The interior environment that the foundation wall is subjected to includes environmental control loadings such as thermal and moisture. Prefabricated synthetic drainage layers are sometimes used in lieu of protection board for protecting waterproofing membranes. The drain should be placed below the top of the footing. Choose from our selection of grease-resistant drainage mats, drainage mats, high-traction drainage mats, and more. 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