Bat Batt
Posted in Uncategorized on 11/02/2006 09:42 am by admin
Bat Batt
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US $11.95
Insulating your house, products and information
When it comes to insulating your house properly information on products and how they work will enable you to better understand the task ahead of you. The R-value is a measure of thermal resistance. The bigger the number, the greater the effectiveness. The R-value is a measure of insulation's heat loss retardation under specified test conditions.
Understanding the three heat transfer modes: conduction, convection, and radiation is the key understanding how insulation works.The primary means of heat loss across an uninsulated air-filled space is natural convection, which occurs because of changes in air density with temperature. In natural convection, the air receives heat, becomes less dense and rises. The surrounding, cooler air then moves to replace it. Insulation greatly retards natural convection. Most types of insulation trap air, significantly reducing the convection flow of the air reducing heat loss. This only leaves conduction and radiation transfer. Radiative heat transfer is minimised by having many surfaces interrupting a "clear view" between the inner and outer surfaces of the insulation. Such multiple surfaces are abundant in batting and porous foam. Radiation is also minimized by low emissivity (highly reflective) surfaces. Lower thermal conductivity and, therefore, high R-values can be achieved by replacing air with argon when practical such as between sealed double-glazed windows and within special closed-pore foam insulation. The resistance of each material to heat transfer depends on the specific thermal resistance, which is a property of the material and the thickness of that layer. A thermal barrier that is composed of several layers will have several thermal resistors.Doubling the thickness of a layer means half the heat flow but this may be only approximate some materials. The addition of materials to enclose the insulation such as sheetrock and siding provides additional but typically much smaller R-value.
There are many factors that come into play when using R-values to compute heat loss for a particular wall. Manufacturer R values apply only to properly installed insulation. Squashing two layers of batting into the thickness intended for one layer may increase but not double the R-value and in some cases actually impair the insulation by not giving the insulation enough air gap between the parts or fibres of the insulating material allow it to conduct heat rather than insulate. Manufacturers of insulation and insulating materials spend a lot of time and money testing their products to get the best performance possible. It is foolish to think that using the product other than the recommended way it was intended to be used would give you superior results.
Another important factor to consider is that studs and windows provide a parallel heat conduction path that is unaffected by the insulation's R-value. The practical implication of this is that one could double the R value used to insulate a home and realize substantially less than a 50% reduction in heat loss. Even perfect wall insulation only eliminates conduction through the insulation but leaves unaffected the conductive heat loss through such materials as glass windows and studs as well as heat losses from air exchange due to drafts and unsealed openings or gaps in the insulation.
R-values of products may deteriorate over time. For instance the compaction of loose cellulose fill reduces the volume of air spaces and its insulation value lower with the reduced air space. Some types of foam insulation, such as polyurethane are blown with heavy gases such as chlorofluorocarbons (CFC) or hydrochlorofluorocarbons (HFCs). However, over time a small amount of these gases diffuse out of the foam and are replaced by air, thus reducing the effective R-value of the product. There are other foams which do not change significantly with aging because they are blown with water or are open-cell and contain no trapped CFCs or HFCs (e.g. half-pound low density foams). On certain brands, twenty-year tests have shown no shrinkage or reduction in insulating value.
Many manufacturers will rate the R-value at the time of manufacture;critics argue that a more fair assessment would be its settled value.The foam industry adopted the LTTR (Long-Term Thermal Resistance) method,which rates the R-value based on a 15 year weighted average. However, the LTTR effectively provides only an eight-year aged R-value, short in the scale of a building that may have a lifespan of 50 to 100 years.
https://sites.google.com/site/archwayhomerepair/
Material ft2·°F·h/(BTU·in) per inch
Vacuum insulated panel 3000 !R-30–R-50
Silica aerogel R-10
Polyurethane rigid panel (CFC/HCFC expanded) initial R-8
Polyurethane rigid panel (CFC/HCFC expanded) aged 5–10 years R-6.25
Polyurethane rigid panel (pentane expanded) initial R-6.8
Polyurethane rigid panel (pentane expanded) aged 5–10 years R-5.5
Foil-faced polyisocyanurate rigid panel (pentane expanded ) initial R-6.8
Foil-faced polyisocyanurate rigid panel (pentane expanded) aged 5–10 years R-5.5
Polyisocyanurate spray foam R-8.3
Closed-cell polyurethane spray foam R-5.5–R-6.5
Phenolic spray foam R-4.8–R-7
Thinsulate clothing insulation R-5.75
Urea-formaldehyde panel R-5–R-6
Urea foam R-5.25
Extruded expanded polystyrene (XPS) high-density R-5–R-5.4
Polystyrene board R-5.00
Phenolic rigid panel R-4–R-5
Urea-formaldehyde foam R-4–R-4.6
High-density fiberglass batts R-3.6–R-5
Extruded expanded polystyrene (XPS) low-density R-3.6–R-4.7
Icynene loose-fill R-4
Molded expanded polystyrene (EPS) high-density R-4.2
Air-entrained concrete R-3.90
Home Foam R-3.9
Fiberglass batts R-3.1–R-4.3
Cotton batts (Blue Jean insulation) R-3.7
Molded expanded polystyrene (EPS) low-density R-3.85
Icynene spray R-3.6
Open-cell polyurethane spray foam R-3.6
Cardboard R-3–R-4
Rock and slag wool batts R-3–R-3.85
Cellulose loose-fill R-3–R-3.8
Cellulose wet-spray R-3–R-3.8
Rock and slag wool loose-fill R-2.5–R-3.7
Fiberglass loose-fill R-2.5–R-3.7
Polyethylene foam R-3
Cementitious foam R-2–R-3.9
Perlite loose-fill R-2.7
Wood panels, such as sheathing R-2.5
Fiberglass rigid panel R-2.5
Vermiculite loose-fill R-2.13–R-2.4
Vermiculite R-2.13
Straw bale R-1.45
Softwood (most) R-1.41
Wood chips and other loose-fill wood products R-1
Snow R-1
Hardwood (most) R-0.71
Brick R-0.2
Glass R-0.14
Poured concrete R-0.08
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Liion Batt For Samsung Slb0937 Equivalent $16.99 LIION BATT FOR SAMSUNG SLB0937 EQUIVALENT |