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Air moves in and out of a home through every hole, crack, and crevice. The Department of Energy reports that heating and cooling (space conditioning) account for approximately 56% of the energy used in the typical American home. Roughly one third of air infiltrates through walls, ceiling, and floors. Adding an advanced insulation system is necessary to achieve optimal building performance. Foam-LOK™ spray polyurethane foam is that advanced insulation system. Spray  foam insulation maximizes a home buyer’s investment by sealing the building envelope to stop conditioned indoor air from air from entering a home. Air exchange in and out of a home is a  leading cause of escalating energy bills. The mechanical systems that heat and cool buildings are continuously operating; reducing extreme temperature variations saves on the overuse of mechanical systems and leads to lower energy bills. View air movement chart

 

Maintain Moisture Management

 

In addition to energy consumption, air infiltration and exfiltration, within a home, contributes to almost 99% of moisture migration.

 

Critical Requirements for Mold Growth

 

- Available mold spores
- Available food for mold spores
- Appropriate temperatures
- Considerable moisture

Restricting air movement stops moisture accumulation so that the possibility of mold is less likely to occur. Combined with a properly sized HVAC system, Foam-LOKTM spray foam insulation helps stabilize the indoor humidity levels to minimize moisture and condensation. Reducing moisture and controlling humidity can also add years to the life expectancy of a home, plus contribute to a  healthier indoor environment.

 

Compare Insulation Materials The Differences Contribute to the Bottom Line

 

There are important differences to note between spray foam insulation systems and traditional  insulation materials. The primary feature is that spray foam does not sag, settle, or shrink over time. Spray foam insulation is spray applied to fill cavities of any shape providing a continuous air barrier  and it stays in place. Because traditional insulation does not directly adhere to the  substrate, the chance of the insulation material sagging overtime is high. If traditional insulation is  not properly installed around irregular framing areas or it shrinks in the wall cavity, voids of 1-2% can lower the effective R-value of traditional insulation materials by 25-40%.

By combining proper equipment maintenance and upgrades with appropriate insulation, air sealing, and thermostat settings, you can cut your energy use for heating and cooling, and reduce  environmental emissions, from 20% to 50%. Source: www1.eere.energy.gov/consumer /tips/heating_cooling.html

Insulation Energy Cost and HVAC Size Comparison chart

 

Builder Benefits

Insulation should add value to energy savings, sustainability, air quality, safety, durability, and  comfort. The economic value of spray foam insulation lasts over the lifetime of a building to maintain the environmental needs of future generations.

Simplified Construction: Installing spray foam in between the studs will meet most R-value, air  barrier, and water vapor retarder requirements.

HVAC Equipment Cost Saving: Tightening the building envelope can lead to energy savings of up to 50% and may also allow cost reductions from smaller HVAC systems. Moving the attic thermal boundary to the underside of the roof deck creates a conditioned space for HVAC units and duct work to operate more efficiently.

Flexibility in Framing: High aged R-value of over 6 per inch, permits stud and rafter size reduction  to increase living space.

Enhanced Durability: Wall racking strength is up to three times stronger than conventional insulation in framed walls.

Approved Applicators: Foam-LOK applicators invest in materials that have multiple characteristics in one finished product, allowing builders to confirm several requirements at one  time.

 

About Foam-LOK Approved Applicators

 

Foam-LOK approved applicators promote and install better building solutions. Solutions that are achieved through the application of spray foam insulation. They are committed to the highest  quality installation standards, and demonstrate an aptitude of understanding building science. They value a collaborative approach to build and deliver safe, durable, and energy efficient homes.

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Download pdf FOAM-LOK Spray Foam Insulation Brochure

 

 

Thickness of Spray Polyurethane Foam Affects the R-Value

 

The thicker the spray polyurethane foam (SPF) is, the greater the RSI per 25mm. The RSI of  150mm of SPF is not the RSI of 25 mm times six. The actual RSI will actually be greater. To understand this, we need to examine how the RSI is determined for all insulations.

First of all there are two types of insulations used in buildings. One type is a fibrous type which mainly uses air to provide the insulation and the other type encapsulates a gas which has an insulation value which is greater than air.

If you look at the first type of insulations, you will find them all around the insulating value  of air. Fiberglass, rock wool, cellulose, etc all have an insulation value of about RSI 0.5 per 25 mm. The specific type of insulation and the manufacturing process will vary the actual number, but normally less than 0.01 RSI per 25 mm. For example, glass is not a good insulator in a solid form, but if you melt it and spin the liquid glass like cotton candy, it produces fibers which can be used for insulation. The reason that the insulation value of solid
glass jumps when it becomes fiberglass is that you are now measuring the insulating value of the air between the glass fibers. This concept applies to all fibrous insulations.

 

“The thicker the SPF the greater the RSI per 25mm.”

 

Foamed plastic insulations use a blowing agent as part of thel iquid mixture used to make sprayed polyurethane foam insulation. The blowing agent provides two functions. The first function is to gasify at a certain temperature to produce tiny bubbles or cells. As part of the reaction which takes places, the cells are produced and then the plastic around the cell hardens. The result is a rigid foamed plastic insulation made up of cells which have trapped the gas which produced the cell. The insulation value of the foamed plastic is tied to the thermal conductivity of the gas trapped in the cells. It would not be unusual for the RSI of freshly sprayed polyurethane foam to be 1.2 per 25mm. At this time, the RSI is the value per 25mm times the thickness. As spray polyurethane foam cools off, loosing the heat caused  by the exothermic reaction, the gas within the bubbles cools and creates a slight vacuum.

At this point the thermal conductivity is still about the same as a vacuum also provides an insulation value (think vacuum thermos for your coffee). Over time, air which touches the surface of the SPF is drawn into the cell to balance the pressure.

Once inside the cell, the gas now becomes a mixture of the blowing agent and air and the thermal conductivity increased (RSI goes down). The outside layer of cells is the first to have this dilution happen. Over time additional layers will be subject to the same process. If the foam is exposed on both sides, this process will start from both sides and work toward the middle. As the time it takes for this process to happen to each layer, the thicker the foam, the longer it will take for the center to bereached. As a result of thisSPF which is 600 mm thick will have a greater RSI per 25 mm when compared to a 25 mm specimen sprayed at the same time as it takes time for this process to move through the material.

To measure the average RSI that SPF will have it has been suggested that a 15 year average be used. The reason for this is that the RSI per 25mm will drop the most very early on in the aging process and then level out. Laboratory tests have shown that the five year RSI is very close to the 15 year value. The RSI of material tested at its full intended thickness after a five year period have been accepted by evaluation agencies as the RSI which the manufacturer can claim.

For manufacturers who do not want to wait for five years to determine the RSI they can claim can use the CAN/ULC S770 Long Term Thermal Resistance test method topredict the RSI at five years. In Canada, there is a requirement of the CAN/ULC S705.1 Material Standard for SPF that this test method be used to determine the RSI claimed by the manufacturer. The manufacturer must conduct this test on a number of thicknesses and declare the results.

This test is conducted with the SPF being exposed on both sides. The “skin” formed when SPF is installed on a substrate and when layers of SPF is installed will decrease the dilution process and provide a higher RSI than what the S774 test method will show. The thickness of the skins will vary depending on what material the substrate is and the temperature of the substrate. Research work has not been done yet to quantify what the increase would be.

When specifying the thickness of the foam, keep in mind that the greater the thickness, the greater the RSI per 25 mm. Check the manufacturer’s documentation to get the exact RSI you will receive at the thickness you intend to install.

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Download pdf CUFCA Thickness of Spray Polyurethane Foam Affects the R-Value

 

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