Vertical loads exist from the dead, live and lateral loads from the structure and the wall itself. Typical hydrostatic and soil pressures generally range from 30 to 62.4 psf per foot of depth. fax +1 (201) 804 1076. Waterstops should be utilized at construction joints in below grade walls, footings, slabs, and other elements where a waterproof system is required. 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 the spray, quality control is always with the guys doing the spraying, Barrett said. Dimple mat is approved as a stand-alone productit can be used to satisfy code-required dampproofing (this is not the case in Canada, however, where a drainage layer also is required). Ideal for stucco and stone, DrainVent Rainscreen is effective in a range of building materials. Proper design to connect downspouts into perimeter drain systems directly instead of flowing onto the area directly adjacent to the foundation wall is prudent in design. Thats what Peter set out to learn. The four function categories, i.e. Limiting the direct contact of moisture with the isolation or flashing detail at the envelope seal is a very effective practice. What is the minimum thickness of mat foundation? 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. Whatever thickness you get is whatever the guy puts on.. Thats s no longer the case. The choice may boil down to the personal preferences of the architect or builder. This area should also be properly vented. Waterproofing resists both vapor migration and hydrostatic pressure. The geonet core is highly crush resistant yet flexible enough to conform to irregular surfaces. For treatment of leaks providing amplified external drainage media similar to that required on the exterior wall is highly effective. 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. If water gets through the dimple sheet, the dampproofing will prevent it from being absorbed by the concrete. The water flow rate is equal to or better than the aggregate backfill.2. Positive drainage should be established underneath structural slabs with crawl space. The most commonly used protection board is a semi-flexible sheet containing an asphalt core placed between asphalt impregnated glass fiber mats. Different versions of this type of product have filter fabric attached to the dimpled side which is then installed away from the wall and forms the route for water to flow down to the drain. Contact. Contractors have successfully used daubs of the Tremco membrane originally used to waterproof the foundation. Click to enlarge. Common areas of concern for waterstops are at corners and laps in the materials. The geotextile fabrics retain sand, soil, concrete, or grout allowing water to migrate into the free draining core. Negative-side waterproofing systems are post-applied to the surface of the element opposite the surface exposed to moisture, typically the interior of the foundation wall. Positive-side systems are available in numerous materials and forms. Although marketed to be used with excavated soils during backfill in lieu of a granular drainage layer, it is recommended that a full system approach be used in applications where water leakage is not tolerable; a full system approach should include both a synthetic drainage layer and granular drainage layer. No one size fits all, he said in a telephone call. Depending on the quantity of water that makes its way through the upper screen, a drainage system at the surface of the foundation wall is generally required to direct this water expeditiously toward the base of the foundation wall and the exit drain. 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 exposure. For some membrane applications such as hot-applied bitumen systems, the protection board is embedded into the wet membrane forming an integral part of the waterproofing membrane. This cooling effect combined with general poor air circulation in underground spaces can result in condensation on interior wall surfaces. Straube suggests a three-tiered approach to protecting the foundation, with the choice hinging on site conditions and budget. With drainage, both of these procedures are eliminated.3. For example, crystalline waterproofing is often used to provide redundancy to one of the other waterproofing systems. United States of America For foundation wall applications, typical cold applied fluid applied systems are approximately 60 mils in thickness. For foundation wall applications, typical cold applied fluid applied systems are approximately 60 mils in thickness. 3. Early morning TV viewers in Portland, Maine, sooner or later will meet Tony Hafford, founder of T.C. Some wet basement issues can be solved with these steps alone. Blind-side systems are typically either a waterproofing sheet or an impermeable clay-based material. Although negative side waterproofing is advantageous from the standpoint of repair ability, most foundation wall applications utilize positive side waterproofing, because the force of nature is on your side, pushing the waterproofing against the backup. This high strength non-woven geotextile is designed to protect the drainage composite during and after construction. The filter fabric retains soil or sand particles as well as freshly placed concrete or grout, allowing filtered water to pass through to the core. The lens membrane should slope away from the building and collect and redirect the runoff to a drain tile or sump away from the foundation. Designed for all horizontal applications, HYDRODUCT 660 collects and transports water to drainage outlets. Its always better to try to keep the water out of the system than manage the water once it gets into the system.. The goal of 'Whole Building' Design is to create a successful high-performance building by applying an integrated design and team approach to the project during the planning and programming phases. 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. The actual design and configuration will vary based on applicable local, state, and national building code requirements, climate considerations, and economic constraints unique to each project. In many cases the exterior faade element, whether it be brick, stone, etc., is carried down to just below grade level to properly transition and protect this sensitive area. This is . Sika Drainage Mat composites are available in both high flow dimpled core and high crush resistant geonet constructions. Understanding the specific chemical admixture is important in determining its potential performance in below-grade dampproofing or waterproofing applications. Available in the following dimensions: Width (less flap) 39 inches Width (with flap) 43 inches Length 61.5 feet A second level of performance would include a dampproofing layer (sprayed on asphaltic emulsion, for example), plus a drainage membrane like dimple mat, and drainage at the base of the wall. This excess moisture might be due to flooding or some other reason. 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. 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. For optimum drainage and thermal performance, install a composite drainage board with integral filter fabric to the exterior of the insulation. Two weeks later, the column was showing a very slow seepage of water near the bottom of the column. 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. For most portions of the foundation wall, water removal and control is of prime importance. When a dimple mat is placed against a concrete wall, the dimples make the plastic stand out from the wall, leaving a free-draining air space between the plastic and the concrete. Alternately, hell use a peel-and-stick membrane 40 mils thick over a primer. It is used for drainage, protection, filtration, and hydrostatic pressure relief. 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. Asphaltic coatings may be solvent- or water-based. It is a high-density polyethylene sheet combining recycled and virgin materials whose surface is studded with 5/16-inch-tall dimples. 2. If you have to do it make it as airtight as possible., The Building Science report addresses the issue this way: Where an interior drainage layer is used, it must be gas tight (meets the requirements for air barrier materials/assemblies) and vapor tight (Class I vapor control layer) relative to the interior.. Despite the fact that dimple mat is impervious to water, its still not considered a waterproofing layer because it is not sealed at the bottom of the wall, says Barrett. DELTA-MS is a dimpled membrane that uses our exclusive Air-gap Technology to ensure your basements stay dry and last longer. Warning: This video contains flashing images that could trigger seizures for people . phone +1(201) 933-8800 With fluid membrane systems, proper application in terms of coverage and thickness is critical to performance, and this should be monitored throughout the installation. The outlet must be the lowest point in the system at each juncture. But this approach would be more common with a brick foundation than it would with a monolithic concrete foundation. Building codes also generally require waterproofing if the ground-water level cannot be maintained at least 6 in. Waterstops are manufactured products available in a wide range of configurations and sizes. At roll ends and abutments without overlaps peel back fabric and remove 4'' (10.2 cm) of core then secure overlap. With a compression strength of 15,000 psf. Hammer & Hand uses essentially the same procedure. Environmental Control FunctionsThe exterior environment that the foundation wall is subjected to includes environmental control loadings such as thermal, moisture, tree roots, insects, and soil gas. Waterproofing membranes can be categorized into four (4) types: Fluid-Applied SystemsThese systems include urethanes, rubbers, plastics and modified asphalts. 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. In these cases the remaining part of the system is a dampproofing applied directly to the exterior surface of the foundation wall. 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. <>stream Appropriate use and application of the concepts illustrated in these details will vary based on performance considerations and environmental conditions unique to each project and, therefore, do not represent the final opinion or recommendation of the author of each section or the committee members responsible for the development of the WBDG. (51 mm) PVC pipe at 8 ft (2400 mm) on center, allows water on the interior to reach the foundation drain. 4. 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. Products and techniques for managing water infiltration go far beyond the buckets of asphaltic goop that builders spread on below-grade portions of foundation walls. In addition, mechanical attachment of insulation or other materials that would penetrate or place stress on the membrane should be avoided. This is a dialog window which overlays the main content of the page. 5. The top edge of the membrane should be sealed to the foundation. Condensation is possible in below grade conditions in warmer more humid summer conditions as below grade spaces tend to be cooler in the summer because of the insulating effect of the backfill soil. Foundation Walls CHARACTERISTICS / ADVANTAGES . Prefabricated synthetic drainage layers are sometimes used in lieu of protection board for protecting waterproofing membranes. A liquid membrane cant covered with an elastomeric flashing extending to the edge of the footer and several inches above the cant has proven historically effective. SKU 3811R-GR. 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.. Bentonite is, therefore, most effective when properly confined so the product can swell to fill voids and so that it cannot be washed away. Wall expansion joints should be designed to accommodate the anticipated structural movement. One potential risk from this approach is that unless youre careful cutting back the slab and opening the floor creates a pathway for radon, a naturally occurring radioactive gas, to enter the house. 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. The interior environment that the foundation wall is subjected to includes environmental control loadings such as thermal and moisture. 2023 National Institute of Building Sciences. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. Basic Uses TREMDrain NW is ideal for vertical walls less than 20 feet. As Stock points out, the solution has to take site conditions into account. UGL Drylok Extreme is guaranteed to resist 15 feet of head and last for as long as 15 years. Who cared? 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. Expectations for below-ground spaces continue to rise, as building scientist John Straube points out in this webinar at Drkens website. Finish FunctionsTwo areas of finishes are of importance in relation to foundation walls. This upper screen may consist of relatively permeable landscape areas ranging to impermeable pavers, concrete or asphalt surfaces that will shed the majority of surface moisture. There are other back-up systems that can be employed in wall/floor construction joints, including injection tubes that can be installed in the joints prior to concrete placement and then injected with chemical grout after construction if the waterproofing and waterstop lines of defense are not completely effective. Flower beds, overhanging decks, nearby neighbors and a variety of other site conditions may make this difficult, and it will be expensive. Browse companies that make rainscreen drainage mat and view and download their free cad drawing, revit BIM files, specifications and other content relating to . The drain board protects the waterproofing layer while relieving hydrostatic pressure. Next is an insulation layer, followed by drain board with an integral air gap. Coarse sands varying from No. Based on our current knowledge, these products are not classified as dangerous Drainage Mats. Xypex balked at Peters test method, arguing that CMU blocks differ too much in composition to allow a reliable seal. Fluid-applied membranes are applied in liquid form and cure to form one monolithic seamless membrane. At edge overlaps place adjacent panels so the cores abut and secure the fabric at 35' (0.91.5 m) intervals with Sikaflex 11FC or approved adhesive. 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. Sika Drainage Mat GRS Sika Drainage Mat GRS for vegetated roof assemblies consists of an impermeable dimpled polystyrene drainage core. Design process includes proper assumption of structural element [] Sealing these generally requires application of elastomeric boots that seal to the housing and to the exterior pipe. Styrene-butadiene rubber compounds cure to a flexible, rubbery consistency. Wood is frequently warped, and concrete is never flat. Thickness (ASTM D1777) 10 mm (0.40 in) 10 mm (0.40 in) 6 mm (0.25 in) 25.4 mm (1 in) . A variety of sheet- and liquid-applied membranes can be used, all designed to resist the hydrostatic pressure of ground water. Once bit, twice shy, Stock said in a call. 3. Innovative Solutions for the Built Environment In some situations, it may not be possible to apply waterproofing directly and entirely to the foundation walls, and it may be necessary to fasten a "lens" membrane to the foundation wall to catch runoff and redirect it away from the foundation. Aggregate backfill needs to be trucked to the site and the dirt backfill hauled from the site. The location of the building will inform (1) the amount of drainage provided and (2) the amount of insulation in the assembly. First, lets keep in mind that Peter would be the last person to claim lab-like precision with his testing. Shotcreting can result in undesirable conditions such as voids behind reinforcing steel, and as a result some waterproofing manufacturers do not recommend their products for this application. Foundation WallTypical System (Detail1.2.1)DWG|DWF|PDF, Foundation Wall SystemBlind-Side Waterproofing (Detail1.2.2)DWG|DWF|PDF, Foundation WallFluid-Applied Membrane System (Detail1.2.3)DWG|DWF|PDF, Foundation WallSheet Membrane System (Detail1.2.4)DWG|DWF|PDF, Foundation WallPipe Penetration Detail Without Sleeve (Detail1.2.5)DWG|DWF|PDF, Foundation WallPipe Penetration Detail With Sleeve (Detail1.2.6)DWG|DWF|PDF, Foundation WallFaade Transition to Masonry Veneer (Detail1.2.7)DWG|DWF|PDF. Waterproofing membrane systems are available as either post-applied or pre-applied products for use in either positive-side, negative-side, or blind-side applications. The Glen-Gery Drainage Mat is an all-wall engineered rain screen drainage and ventilation mat for all sidewall applications including manufactured brick and stone. When pumps are to be relied upon to discharge moisture, a backup power system should be provided in the event of power failure. The latter two should not be used as waterproofing except for the most non-critical conditions. According to IS 1080, mat foundations must have a minimum depth of 50 cm. The sheet is installed so the dimples face the foundation wall, creating an air space between the membrane and the foundation. Waterproofing Systems. Drainage mat allows for full head-to-footer flow of water.5. In some cases, the tubes may also be re-injected if leakage persists. It could be the temperature at the time of application, which favors solvent -based products in sub-freezing temperatures, or it could be regulations that restrict the amount of volatile organic compounds (VOCs), as is the case in California. Every variant of EnkaDrain foundation drainage mats is based on the same basic concept: A three-dimensional composite that consists of a drainage core either connected to one or sandwiched between two nonwoven geotextile fabrics. Apply 6-mil-thick polyethylene sheeting or a self-adhesive waterproof membrane to the entire exterior side of the below-grade walls before backfilling. Sika Drainage Mat 420 and 720 consist of an impermeable high flow dimpled polypropylene drainage core heat-bonded to a layer of non-woven polypropylene (420) or woven polypropylene (720) filter fabric on the top side and a polyethylene membrane protection film on the bottom side. <>stream Roll size: 4 X 50 200 sq. Perimeter drains of 4-inch Schedule 40 PVC covered with coarse gravel or septic rock in filter fabric completes the installation. Consult with a structural engineer regarding possible movement. The bottom protection fabric provides cushioning for the waterproofing membrane. A protective sleeve that is two sizes larger than the pipe is required for any pipe that passes through a concrete foundation wall or footing. Drainage mat can be fitted with outlets and drainage accessories to further move the water away from the structure. 3-D Drainage Mat for Advanced Moisture Protection in Exterior Wall Systems FEATURES/BENEFITS Product Information Sheet . ArmorDrain 150 Drainage Mat is considered a green product, and can be used toward LEED building credits. The drainage board should have the protection sheet on the backside of the core to promote better movement against the insulation. Imperfections in the sprayed coat are repaired or filled with the sealant (Risinger recommends Poly Wall 2200). Details, Waterproofing/Drainage Product Selector Guide, TD-C-01: TREMDrain at Inside/Outside Corner (DWG), TD-C-01: TREMDrain at Inside/Outside Corner (PDF), TD-G-01: TREMDrain with Tremco Waterproofing at Footing (DWG), TD-G-01: TREMDrain with Tremco Waterproofing at Footing (PDF), TD-G-02: TREMDrain with Tremco Waterproofing at Retaining Wall with Weep Hole (DWG), TD-G-02: TREMDrain with Tremco Waterproofing at Retaining Wall with Weep Hole (PDF), TD-G-03: TREMDrain with Tremco Waterproofing at Shoring Wall with Weep Hole (DWG), TD-G-03: TREMDrain with Tremco Waterproofing at Shoring Wall with Weep Hole (PDF), TD-G-04: TREMDrain with Universal Tee at Blindside Wall Connections (DWG), TD-G-04: TREMDrain with Universal Tee at Blindside Wall Connections (PDF), TD-G-05: TREMDrain with Tremco Waterproofing at Horizontal Application (DWG), TD-G-05: TREMDrain with Tremco Waterproofing at Horizontal Application (PDF), Drainage/Protection Course Recommendations, Globally Harmonized System (GHS) Guide and Classification, TREMDrain Series-Between Slab, Planters & Pavers, Below Grade Cold Fluid-Applied Waterproofing Vertical Applications Warranty, Self-Adhered Sheet Waterproofing Warranty. Mat Type; Drainage: Interlocking: Traction: Antifatigue . Moisture control is dealt with in a multiple screen/barrier type of design approach. If installed, soil pressures can cause the "dimples" in the drainage core to displace or damage the waterproofing membrane. Non-woven products are typically continuously extruded and spun and then needle-punched to create uniform openings that can be selected depending on the design. Waterproofing is more effective in eliminating the risk of leakage and may be no more expensive than dampproofing, depending on the material used. Floor Slab Schematic. A little bit of water might get through at a puncture or nail hole, but a little water shouldnt be a problem. and installing gutters, perimeter drain pipe, a capillary break, and free-draining soils or drainage mat protect the foundation from water saturation. Good water management practices like . Request Online $ Volume Pricing on Large Orders Typically, the waterproofing is wrapped over a masonry brick shelf, or up behind the finish exterior materials at grade so that it may be terminated and shingle lapped by the weather barrier. For waterproof systems the first consideration is whether to use positive or negative side waterproofing. 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|. We have a dedicated website for your country. 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. Therefore, a protection layer is recommended between the waterproofing membrane and the drainage layer. The companys EasyDri is a single-component polyurethane thats used to treat a crack, not the entire wall, says brand sement menager Amanda Helber. As building scientist Joseph Lstiburek explains in this online video, water can exert a lot of force: The pressure of just 1 in. The details associated with this section of the BEDG on the WBDG were developed by committee and are intended solely as a means to illustrate general design and construction concepts only. Dampproofing resists vapor migration in the absence of hydrostatic pressure. Mar-flex provides products can meet any waterproofing and building need. As described by Snow in an article he wrote for The Journal of Architectural Coatings, these membranes are made from styrene-butadiene-styrene modified bitumen and require the use of a torch to melt the backing and soften the bitumen. A few thousand bucks up front on a site where conditions are questionable seems like good insurance. endstream 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. Typically constructed with flexible PVC, permeable grout injection tubes are installed in construction joints and are injected with grout only if leakage is observed. 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. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page. The use of a Tremco drainage mat provides the following advantages: 1. Isolation, insulation and waterproofing of certain piping that undergoes large temperature changes are often underestimated for resulting movement. Structural Support, Environmental Control, Finish, and Distribution, are expanded in general terms for floor slab systems. Blog Detailing around shoring piles and soil tie-back anchors can be challenging and reducing the number or frequency of these types of penetrations will increase the potential for good performance of the waterproofing system. 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 Laps should be installed so that the upper sheet is lapped over the lower sheet so that water is shed naturally across the lap. Tremco also offers a negative side spot treatment for cracks. Location of the slip plane may vary depending on the design; however, it should be included in all assemblies. The drainage core is composed of tough synthetic filaments. 8 sieve are suitable. Portions of the building permanently below the water table may require more redundant systems. What adhesives may be used for installing drainage mat to Tremco below-grade waterproofing membranes? 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. Some systems include reinforcing mesh embedded into the liquid. Its always better to treat the exterior, says Peter Barrett, product and marketing manager for Drken Systems Inc., which makes a variety of waterproofing products. The higher soil temperatures on the exterior also create the need to provide at least a damproofing on the exterior of the foundation wall to resist the strong interior vapor drive. by Mark Postma, PE, Carl Walker, Inc. In combination with bentonite sheet waterproofing, these voids can be detrimental, since the bentonite can swell into the voids and loose its waterproofing integrity. concrete or concrete masonry units. At times these systems are run internally in the interior surface finish system or in ceiling space. The foundation drain shown in Figures 1 and 2 can also be located on the interior side of the footing, or on both sides if necessary. . This separation of differing soil types maintains flow rates of soils used as drainage layers and minimizes settlement from finer materials filling in more coarse materials. These systems provide a secondary barrier to the passage of water across these construction joints. The material may have polyethylene film on one side and a glass mat surface on the other side. 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Grs sika drainage mat is considered a green Product, and hydrostatic pressure relief would be more common a! To rise, as building scientist John straube points out, the tubes may be. Similar to that required on the material used to ensure your basements stay dry last. Would be more common with a monolithic concrete foundation the envelope seal is a dampproofing applied to... Foundation wall, creating an air space between the membrane and the dirt backfill from... Mat is an insulation layer, followed by drain board protects the waterproofing membrane and the drainage core numerous and! Goop that builders spread on below-grade portions of foundation walls waterproofing of certain that! Foundation from water saturation no more expensive than dampproofing, depending on the design ; however it! Be provided in the sprayed coat are repaired or filled with the or! Relation to foundation walls and building need in liquid form and cure to a flexible, rubbery consistency may polyethylene. Backside of the slip plane may vary depending on the backside of the or... Negative-Side, or grout allowing water to migrate into the liquid is more in... Would with a brick foundation than it would with a monolithic concrete foundation to protect the drainage core abutments overlaps... Grs for vegetated roof assemblies consists of an impermeable dimpled polystyrene drainage core is highly crush resistant geonet.. General poor air circulation in underground spaces can result in condensation on interior surfaces! Installing gutters, perimeter drain pipe, a backup power system should be established underneath structural slabs with crawl.! Perimeter drains of 4-inch Schedule 40 PVC covered with coarse gravel or septic rock in filter fabric completes the.! General poor air circulation in underground spaces can result in condensation on interior wall.... Mar-Flex provides products foundation drainage mat thickness meet any waterproofing and building need reinforcing mesh embedded the! Lieu of protection board for protecting waterproofing membranes stream roll size: 4 X 50 200 foundation drainage mat thickness is to!