- Open-cell spray foam is spongy in nature as compared to Closed-cell which is less porous and rigid in nature.
- Closed-cell spray foam is less permeable to water vapor as compared to Open-cell spray foam so it allows relatively less water vapor to penetrate.
- Closed-cell spray foams normally have R-values between 5 to 8 per inch as compared with Open-cell spray foams insulator typically have R-values of 3 to 4 per inch.
- Closed cell spray foam is perfect for cramped places. A thin layer of closed cell spray foam is as effective as thick layer of closed cell spray foam.
- Closed-cell foam rarely requires trimming and produces little or very less waste on other hand open-cell spray foam requires trimming after installation and more waste is during installation.
- Closed-cell foam is very strong and increase structural strength of building by reinforcing the surface where as open-cell foam is soft with little structural strength.
- Closed-cell foams are superior insulators as compared to open cell spray insulators.
Posted by Green Tips Comments Off
Jun 25, 2010 @ 04:06
Energy Audit is complete survey of energy consumption in a building. Energy Audit provides the vital information regarding overall energy conservation in residential or commercial building. It covers energy utilization analysis and evaluation of energy conservation measures. The main objective of energy audit in an occupied building is to reduce energy consumption while maintaining or improving human comfort, health and safety. Energy Audit mainly deals various energy inputs, identifying pattern of energy consumption, relating energy inputs and output, Identifying potential areas of thermal and electrical energy economy, highlighting energy wastage in major areas and fixing of energy saving potential in targets areas. The main techniques that are used in energy audit are Blower-Door testing, Weatherization Programs, Thermal Imaging Video of Home, Duct-Blasting Test, Furnace Flute Testing, Moisture Reading Technology. At completion of audit, energy auditor provides you with a full written report of the auditor’s findings and solutions to increase your home’s energy efficiency
Posted by Green Tips Comments Off
Jun 22, 2010 @ 04:06
There are various benefits of installing radiant barrier in residential and commercial buildings. It works on principle of reduction of heat loss due to thermal radiation. All materials radiate, or emit, energy by thermal radiation and the amount of energy emitted depends on the surface temperature. In buildings, this heat loss ususlly occurs between the roof deck and the attic floor. During day time solar energy is absorbed by the roof, heating the roof and causing the underside of the roof sheathing and the roof framing to radiate heat toward the attic floor. Radiant barriers is placed on the attic floor and it reflects most of the heat radiated from the hot roof back toward the roof making upper surface of insulation cooler than it would have been without a radiant barrier. Radiant barrier minimizes the heat transfer to the room below the ceiling. A radiant barrier also reduces heat losses through the ceiling in winters. Thus a radiant barrier effectively reduces heat transfer from within and outside of o building
Posted by R Value Comments Off
Jun 18, 2010 @ 05:06
Heat has tendency to flow from hotter place to cooler place. Insulation is rated by how well it resists heat flow and R-value is measure of insulation capability of that insulator. These measurements R-value are taken in a laboratory environment. Higher the R-value (resistance) of insulator the better the insulating power of that insulator. R-value of an insulator is a real important criterion for both warm and cooler environments as it resists heat transfer through conduction, convection, and radiation from inside to outside and vice-versa. The density of an insulating material determines its R-value but just because it’s thick doesn’t mean insulation has a high R-value. In fact more R-value can be obtained by increasing density while keeping same thickness. R-value is given in SI units, typically square-meter Kelvin per watt or m²•K/W (or equivalently to m²•°C/W). In the United States customary units, R-values are given in units of ft²•°F•h/Btu (1 h•ft²•°F/Btu = 0.176110 K•m²/W, or 1 K•m²/W = 5.678263 h•ft²•°F/Btu).
A vapor barrier is an impermeable membrane which blocks the flow of air through the building envelope. Water vapor moves into building cavities by two main mechanisms i.e. diffusion through building materials and by air transport. Vapor barrier is very important part of building envelop and resists the passage of the water vapor that is contained in air. Technically, most materials are only vapor retarders as they have varying degrees of permeability for vapors. For maximum output both vapor barrier and insulation should be installed as both affect each other. Vapor barriers are recommended to keep moisture from penetrating and condensing in the insulation. Excessive moisture can damage framing, siding or drywall. An insulation that fills the wall cavity completely (such as cellulose or foam) can help prevent moisture problems. Most buildings require a vapor barrier for external wall. Vapor barriers are very important for a building as they resist moisture build up inside building and stops rotting of materials and avoid growth of harmful organisms like moss, mildew and molds.
Star Spray Foam Systems, LLC is committed to the propagate use of green insulation processes. We are a full service spray foam insulation coating company providing services in and around Mississippi, New Orleans, Venice, Metairie, Hammond, Slidell, Houma. We use latest equipments and technology along with high performance spray foam insulation. Spray foam insulation can permanently lower heating and cooling energy costs up to 50-60% enabling you to significantly lowering the “Carbon Footprint” of your home and save large amount of energy. Our Professionals perfectly seal off your home or office from outside heat, cold, moisture, mildew, mold, airborne fibers and pests. It also completely eliminates termites and creates an ideal thermal seal. Air quality of your residential or commercial building improves, thus lowering chances of diseases and allergies. Spray foam also provides additional structural support to your building and roof system. We specialize in insulating attic or rafters which offer a cool envelop and help air conditioning system to work more efficiently.
Posted by Green Tips Comments Off
Jun 09, 2010 @ 08:06
Air sealing of living space is very important because air leaks carry in and out moisture and result in higher consumption of energy. This movement of air generally takes place in direction in which we don’t want. In winter air can carry cool and dry air inside or in summers it can carry hot humid outdoor air into your house. Most home owners know air infiltrates in living space from unheated parts of the house like attics, basements, and crawlspaces or through window frames, small openings around doors and fireplaces and chimneys. Following measures should be taken to stop air leak:
- All the cracks between walls and ceiling should be filled.
- All spaces around near interior door frames should be packed or filled.
- Gaps around attic access and pull-down stairs should be closed.
- Fill all cavities around finished attics adjacent to unconditioned attic spaces.
- Seal all utility chase ways for ducts and plumbing and electrical wiring holes.
- Fill all electrical outlets, switch boxes, and recessed fixtures.
- Seal pack holes and cracks in cabinets, and furred or false ceilings in kitchen or bathroom.
Posted by Green Tips Comments Off
Jun 08, 2010 @ 08:06
Heat has natural tendency to flow from a warmer to a cooler space. In summer season heat flows from heated surroundings to cooler space inside and in winter season all heated living spaces to unheated attics, garages, and basements, or outdoors space. This heat transfer takes place mainly through interior ceilings, walls, and floors etc. For enabling living comfort the heat lost in winter must be replaced by heating system of home and the heat gained in summer must be removed by your air conditioner. Insulation provides an effective resistance to the flow of heat. All insulators are rated by R-value or thermal resistance indicating resistance to flow of heat. Density, thickness and type of material decide the R-value of insulator. For calculating the R-value of a multi-layered insulation, R-values of the individual layers is summed up. The efficacy of insulator depend on how, where and what type of insulation is used. Increasing R-value of insulator, increases resistance to heat flow. The over all R-value can differ from R-value of insulator due to heat flow through studs and joists. Insulators stops heat transfer by resisting flow of heat.
Basement is a common area from where frequent leak of cold air occurs. It broadly accounts for 20% of heat loss in poorly insulated home or non-insulated residential and commercial buildings. It is also the place from where lot of moisture gets into the house. The most important area to insulate is not the basement walls, but the area where the house meets the foundation. Leaks at the top around the floor joists and leaks at the sill plate are common in older houses. If gaps are present in sill plate then they should be filled. All care should be taken to properly insulating Crawlspace Walls and Joists and you will surely be able to feel the difference the insulation makes. Properly insulating basement of residential or commercial can save you lot of money by stopping air leaks and thus greatly reducing your energy need for heating and cooling of the building.
Solar powered fans use solar energy for its working. As it uses renewable source of energy, so you do not have to pay for energy it consumes while operating. Keeping the attic ventilated increases the life of roofing materials and also minimizes the growth of moss, mildew and molds which are harmful for health. In properly insulated attic moisture does not increase making place damp, which is a prerequisite for them to grow. The major and marked advantages of using solar powered fan for attic are:
- They are easy to install.
- No wiring is required.
- Considerably reduces cooling load on cooling systems.
- Uses renewable and free source i.e. solar energy.
- Adjustable solar panel.
- Can fit all roof types.