Basement Drying >> How To Dry Out Your Water Damaged Basement

Manage exterior ground and rain water by using gutters and downspouts and by grading the ground around the perimeter at least six inches of fall over ten feet of run. Install a foundation drain How To Dry Out Your Water Damaged Basement surrounded by gravel and enclosed by filter fabric. Apply either damp-proofing or water-proofing to the foundation walls (Dastur et al. 2005).
 
Add back fill material or drainboard around the foundation that is free draining to allow ground or rain water to drain down to the perimeter drain installed at the base of the footing. How To Dry Out Your Water Damaged Basement There are a variety of approaches to footing drain design that are discussed in the next section. Add a capillary break (a closed cell foam sill sealer or gasket) between the top of the concrete and the sill plate to prevent moisture migration between the concrete foundation and the floor structure above.
 
Similarly, to limit the amount of ground water absorbed through the footing, install a capillary break between the footing and the concrete wall (BSC 2006). Prevent moisture diffusion from the ground into the slab by covering the entire ground with How To Dry Out Your Water Damaged Basement a vapor retarder. It is recommended that the vapor retarder be in direct contact with the concrete slab and that no sand or gravel be placed in between (Lstiburek 2008).
 
Include a four-inch deep, 3/4-inch diameter (no fines) stone bed above the ground and right below the vapor retarder. How To Dry Out Your Water Damaged Basement This functions as a granular capillary break below the vapor retarder, a drainage pad, and an air pressure field extender for the soil gas ventilation system.
 
DRAINAGE AND WATERPROOFING
· Keeping water out of basements is a major concern in many regions. The source of water is primarily from rainfall, snow melt, and sometimes irrigation on the surface. In some cases, How To Dry Out Your Water Damaged Basement the groundwater table is near or above the basement floor level at times during the year. There are three basic lines of defense against water problems in basements: (1) surface drainage, (2) subsurface drainage, and (3) waterproofing on the wall surface (see Figures 2-3 and 2-4).
 
· The goal of surface drainage is to keep water from surface sources away from the foundation by How To Dry Out Your Water Damaged Basement sloping the ground surface and using gutters and downspouts for roof drainage. Subsurface drainage systems intercept, collect, and carry away any water in the ground surrounding the basement.
 
Components of a subsurface system How To Dry Out Your Water Damaged Basement can include porous backfill, drainage mat materials or insulated drainage boards, and perforated drainpipes in a protected gravel bed along the footing or beneath the slab that drain to a sump or to daylight. Local conditions will determine which of these subsurface drainage system components, if any, are recommended for a particular site.
 
 · Figure 2-3 shows a dual drain system, which is the most robust option. Figure 2-4 shows a single-drain configuration. In both cases, provision is made to drain water originating at the How To Dry Out Your Water Damaged Basement surface that drains down along the foundation, as well as water that may accumulate under the slab. Figure 2-3 shows the best practice system for foundation perimeter drainage. It consists of two independent loops of perforated foundation drain, one inside the footing and one outside.
 
These drain independently, either to daylight or to an internal sump. Figure 2-4 shows another option that is appropriate when site drainage conditions are good. It also allows How To Dry Out Your Water Damaged Basement drainage of the sub-slab gravel layer, through ducts that run through the bottom of the footing. These ducts should be placed as close to the bottom of the footing as possible, to avoid water pooling on the inside of the footing.
 
Its single loop of foundation drain is on the outside of the footing, and drains to daylight or to an internal sump. It should be noted that the duct connection to the exterior of the footing can reduce the How To Dry Out Your Water Damaged Basement effectiveness of subslab depressurization radon mitigation systems by reducing the ability of the system to maintain sufficiently low pressures beneath the slab.
 
· The final line of defense— waterproofing—is intended to keep out water that finds its way to the wall of the structure. First, it is important to distinguish between the How To Dry Out Your Water Damaged Basement need for dampproofing versus waterproofing. In most cases a dampproof coating covered by a 4-mil layer of polyethylene is recommended to reduce vapor and capillary draw transmission from the soil through the basement wall.
 
A dampproof coating, however, is not effective in preventing water from entering through the wall. How To Dry Out Your Water Damaged Basement Waterproofing is recommended (1) on sites with anticipated water problems or poor drainage, (2) when finished basement space is planned, or (3) on any foundation built where intermittent hydrostatic pressure occurs against the basement wall due to rainfall, irrigation, or snow melt.
 
Except on very dry sites, it How To Dry Out Your Water Damaged Basement is generally recommended to use waterproofing as a best practice. On sites where the basement floor could be below the water table, a crawl space or slab-on-grade foundation is recommended.
· A key question in foundation design is whether to place insulation on the inside or outside surface of the basement wall (Figure 2-5). In terms of energy use, there is not a significant difference between the same amount of full wall insulation How To Dry Out Your Water Damaged Basement applied to the exterior versus the interior of a concrete or masonry wall. However, the installation costs, ease of application, appearance, and various technical concerns can be quite different. Individual design considerations as well as local costs and practices determine the best approach for each project.
 
· Rigid insulation placed on the exterior surface of a concrete or masonry basement wall has some advantages over interior placement in that it (1) can provide continuous insulation with no thermal bridges, (2) protects and maintains the waterproofing and How To Dry Out Your Water Damaged Basement structural wall at moderate temperatures, (3) minimizes moisture condensation problems, and (4) does not reduce interior basement floor area (Figure 2-6).
 
If the exterior insulation value is high enough, the joists and sill plates can be left open to inspection How To Dry Out Your Water Damaged Basement from the interior for termites and decay. On the other hand, exterior insulation on the wall can provide a path for termites if not treated adequately and can prevent inspection of the wall from the exterior.
 
 Exterior insulation places the foundation wall within the thermal envelope. This means the wall will be warmer in winter, How To Dry Out Your Water Damaged Basement and moisture is free to dry to the interior. Because of this, impermeable materials like oil paint, polyethylene, or vinyl wallpaper should not be used as interior finishes.

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