Basement Drying >> How To Prevent Basement Condensation

Perlite is a mined volcanic glass material. When heated, water trapped in the glass matrix vaporizes. As it does so, it expands the heat-softened glass How To Prevent Basement Condensation material, creating a particle with a rough outer surface and an interior composed of closed-cell glass bubbles. He recommends use of this product over lower-density (higher R-value) products because How To Prevent Basement Condensation those lighter products would need to be poured in two lifts, increasing cost. The 25 lb/ft3 product can be poured to How To Prevent Basement Condensation the 7-ft depth in one lift. The lighter products could be used in shallower trenches. Craig gave a preliminary installation cost estimate of $3,000 for the 15.6 yd3 at the prototype house. How To Prevent Basement Condensation These costs may vary some depending on particular jobsite and concrete mix conditions.
 This expanded perlite material can replace the aggregate How To Prevent Basement Condensation in a concrete mixture. The result is a lightweight concrete with insulating characteristics. This material is used as a lightweight concrete for roof and floor decks in buildings, for How To Prevent Basement Condensation underground pipe insulation, and as a base for vinyl swimming pool liners. Material Properties As with cellular concrete, perlite concrete can be produced with or without sand. How To Prevent Basement Condensation Sand increases compressive strength, but increases thermal conductivity significantly. Table 3 How To Prevent Basement Condensation gives density, compressive strength, and thermal conductivity values How To Prevent Basement Condensation for mixes in the lower density range of available products.
 Perlite concrete mixes consist of Portland cement with How To Prevent Basement Condensation an air-entraining admixture, How To Prevent Basement Condensation perlite aggregate, and any other admixtures such as waterproofing agents. The mix is delivered in a ready mix truck. A concrete pump will be required to convey the uncured material from the truck to the work site. The concrete would be placed in the How To Prevent Basement Condensation trench according to typical concrete placement techniques. Water Management Vicki Warman, sales manager for the How To Prevent Basement Condensation Schundler Company, a perlite expander in Edison, New Jersey, talked with the team about whether the physical properties of perlite would be appropriate for use below How To Prevent Basement Condensation grade, especially concerning its behavior in the presence of moisture.
This behavior is not well-characterized in the literature. Vicki reports that the very rough surface How To Prevent Basement Condensation of the perlite particles does adsorb moisture readily, but that the closed-cell structure of the material does not accumulate water internally. Published information from the How To Prevent Basement Condensation Perlite Institute (Perlite Institute b) suggests that a silicone-coated perlite material is typically installed as a core fill in concrete masonry cores to reduce water absorption, presumably referencing capillarity How To Prevent Basement Condensation induced by the tight spaces on and between perlite particles. Once bound in a concrete matrix, it is unclear how How To Prevent Basement Condensation these properties would affect the moisture resistance of the cured product.
 Presumably the How To Prevent Basement Condensation closed-cell glass bubbles would not accumulate water; because of the low vapor permeability of glass, one would expect How To Prevent Basement Condensation little vapor diffusion through the perlite itself. The concrete could be assumed to perform according How To Prevent Basement Condensation to its typical material performance characteristics, unless otherwise treated. Silica-bearing admixtures blended into the uncured product are one option How To Prevent Basement Condensation offering a high degree of water penetration resistance, and could be used as a substantially waterproof product. We interviewed Chuck Klettenberg, mix designer How To Prevent Basement Condensation from Marshall Concrete, Inc., a local concrete ready mix supplier, supplied some preliminary cost information.
Marshall How To Prevent Basement Condensation has had no previous experience with perlite concrete. A mix design taken from the Perlite Institute website ( used a 22 lb/ft2 dry density product, with How To Prevent Basement Condensation a thermal conductivity of 0.54 Btu in./h ft2 °F. He gave a quote for the prototype house (15.6 yd3) of $2,929.26. John Fischer, dispatch operator at Marshall Concrete, quoted a price of $600 for a line pump and operator to move the How To Prevent Basement Condensation material from the truck to the house. John noted that fly ash is often used in mixes that are to be pumped, because of the lubricating nature of that material in pumping How To Prevent Basement Condensation machinery.
 In How To Prevent Basement Condensation discussions on using fly ash with John Fodor of Cellular Concrete Solutions, he explained that the How To Prevent Basement Condensation Minnesota Pollution Control Agency tightly regulates the use of fly ash-containing concretes in contact with the ground because of concerns about leaching contaminants into How To Prevent Basement Condensation groundwater. This issue needs further research to determine the extent of prohibition, since its use could increase How To Prevent Basement Condensation workability of the mix and reduce cost by reducing the quantity of Portland cement in the mix. Cast-In-Place Polyurethane Foam Two-part polyurethane foams are commonly How To Prevent Basement Condensation used in new construction and renovation as thermal insulation and air sealing materials.
 The material is formed How To Prevent Basement Condensation from two liquid components that are mixed on site and applied using spray gun equipment. In addition to the How To Prevent Basement Condensation spray-applied variety of foams, there is a class of polyurethanes that can be poured into cavities. These products are formulated to cure much more slowly than their spray-applied How To Prevent Basement Condensation counterparts; this means that they can be applied in much thicker layers without risk of How To Prevent Basement Condensation spontaneous combustion caused by the exothermic curing reaction. We The team interviewed Mike Larson, Midwest sales manager for NCFI Polyurethanes. NCFI manufactures both spray-applied and pourable polyurethanes How To Prevent Basement Condensation for geotechnical applications. Mike suggested two products that would work in our application; one is spray applied (but slow-curing, so can be applied in deep lifts), and How To Prevent Basement Condensation one is poured.
Both achieve densities in the 2–3 lb/yd3 range. Table 4 shows the properties of the How To Prevent Basement Condensation two foams. For the prototype house, both materials would be applied in two lifts. The 23-004 product is simply placed in the trench, using a 3/8-in. diameter plastic hose. The 24-023 would be applied How To Prevent Basement Condensation with a spray gun; Mike reports that the applicator would simply aim at the bottom of the trench and fill from there. Because these products have significantly higher R-values than the cement-based How To Prevent Basement Condensation products (≈R-6/in versus ≈R-1.5–1.8/in for concrete-based), a 4-in.-wide trench would work. But the trench would How To Prevent Basement Condensation be too narrow for the spray application.
Water Management
A study How To Prevent Basement Condensation published by the NRCC (Swinton et al. 1999) examined the performance of a variety of insulation materials for two heating seasons in Ottawa, Ontario. Among the How To Prevent Basement Condensation findings was the discovery that spray polyurethane foam bonded extremely well to the foundation wall, and that its waterproofing characteristics were sufficient to How To Prevent Basement Condensation negate the need for a separate damp-proofing or waterproofing layer. The spray foam cited in this study is a product How To Prevent Basement Condensation currently used for basement applications, and is likely similar to the one in the NRCC study. The pourable foam being examined in this project is more dense than the spray foam, but How To Prevent Basement Condensation shares closed cell structure and basic chemistry.
Its How To Prevent Basement Condensation waterproofing properties should be similarly robust. Cost These polyurethane foams are typically installed in applications significantly different than what we are proposing. Mike Larsen How To Prevent Basement Condensation of NFCI spoke to some of his contractor customers to arrive at a reasonable cost estimate for this application. The estimated installed cost is about $1.00 per board foot. The prototype home includes How To Prevent Basement Condensation 840 ft2 of area; because the R-value per inch of the foam products is significantly higher than the concrete-based products, we can use a 4 in. thick application (the narrowest trench we can dig with the hydro-vac technology). This gives a quantity of 3,360 board How To Prevent Basement Condensation feet of foam and a cost of $3,360.


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