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  TVM Frequenty Asked Questions

Is the performance of silicones affected by water?
Silicone is naturally water resistant.

Is the performance of silicones affected by low temperatures?
TVM silicone products are not affected by low temperatures when they are within the original packaging. Extreme temperatures will affect many water-based products, but not silicones. Cured silicones have a service temperature of as low as -40°F to -76°F (-40°C to -60°C).

Is the performance of silicones affected by ultraviolet radiation?
No. Ultraviolet radiation will not affect the performance of silicone. All TVM silicone products are suitable for use in interior and exterior applications.

What is the service life of Silicones?
Silicone will not deteriorate like water based latex caulks. Silicone will not harden and will therefore maintain its structure, longevity, and pliability for years to come.

Will silicone harden over time?
No. Silicone, unlike water-based caulks, will not harden, crack or become brittle over time. Silicones will maintain its pliability for decades, eliminating damage from slight movements (e.g. thermal changes or vibrations).

Why use silicone sealants?
Silicones possess the best combination of properties of any available elastomeric sealant:
• A broad spectrum of physical properties
• Wide application and service temperature range
• Fast through-cure rate
• High Moisture Vapor Transmission (MVT)
• Primerless adhesion to many substrates (e.g. glass, metals, plastics, and concrete)
• High resistance to environmental factors (e.g. ozone, sulphur dioxide, ultraviolet radiation)
• Available in a variety of colors

May TVM Draft Stop be used as a FireStop in Fire Rated Construction?
No. TVM Draft Stop may only be used as a FireStop in Non-Rated Construction. Two ASTM Test Methods have been developed for FireStops. ASTM E814 has been developed for Fire-Rated Construction while ASTM E136 was developed for Non-Rated Construction. TVM Draft Stop has only passed ASTM E136 and therefore may only be used as a FireStop in Non-Rated Construction. Remember, TVM Draft Stop may be used as a sealant in other areas where high temperature resistance is necessary.


Spray Foam Insulation

How long has SPF been around?
Spray polyurethane foam was first used commercially in the US in the 1960s for cold storage and industrial insulation projects. SPF roofing systems evolved from exterior applications to tanks and pipes in the late 60s to early 70s. TVM has been developing and refining Mega Fill Pro SPF’s since 2009.

What are the different types of spray polyurethane foam (SPF) insulation and where are they used?
Spray polyurethane foam (SPF) is a tough, resilient solid foam material that can be used to improve energy efficiency in many areas of your home, ranging from air sealing mid-sized holes and gaps to insulating large surfaces in both interior and exterior applications.

Several types of SPF are known as two-component foam because the chemicals used to make the foam come in two separate containers. The chemicals are mixed together in a mixing chamber and are applied using a spray pump or spray gun. Generally, two-component SPF products fall into two main types, either low pressure or high pressure systems:

• TVM Mega Fill Pro Two-component low pressure SPF kits: used by contractors or weatherization professionals to air seal and insulate small to mid-size areas (e.g., additions, crawl spaces, attics, joist retrofit or to fill seams and gaps in primary insulation).

• Two-component high pressure SPF systems: used by SPF contractors to insulate larger areas (e.g., new construction - walls and roofs or major renovations).

What is the difference between low density, open cell SPF and Mega Fill medium density closed cell SPF?
• 1/2 lb Spray Polyurethane Foam (SPF)
Low density, open cell SPF refers to a generic spray polyurethane SPF that weighs between 0.4 to 0.6 lbs per cubic ft when fully cured. It is spray applied to a substrate as a liquid and expands about 100-150 times its original volume to form a semi-rigid/flexible, non-structural SPF insulation. The SPF has an R-value around 3.5 per inch and typically uses water as the blowing agent. Open cell SPF is an air barrier, insulation and can assist in condensation control.

• TVM Mega Fill Pro Medium Density, Closed Cell Spray Polyurethane Foam (SPF)
Mega Fill Medium density, closed cell SPF is used in interior applications and weighs 1.75 lbs per cubic ft when fully cured. It is spray applied as a liquid to a substrate and expands to form a rigid, structural SPF insulation with a compressive strength of 32.5 psi for the RF, 19.8psi for the DS and 13.78 psi for the DSF. TVM SPF has an R-value of 5.0 per inch (aged R-value) for the RF and 7.0 per inch (aged R-value) for the DS and DSF. Mega Fill Pro SPF provides higher R values and is an excellent barrier to air, moisture, vapor and pests.

How does closed cell Mega Fill Pro SPF compare to fiberglass and cellulose?
More “traditional” insulating materials such as fiberglass and cellulose are less expensive upfront; however Mega Fill Pro offers the better value in the long run. Mega Fill Pro has a approximately twice the R value, provides an airtight thermal seal, resists moisture and mold, seals hard to insulate areas, adds structural stability, and more – leading to significant energy savings and an overall better return on investment.

Is Mega Fill Pro SPF temperature sensitive?
Temperature is key in producing good quality foam. For the majority of Mega Fill Pro systems, ideal yield/expansion and adhesion will result when the substrate and chemical temperatures range between 65°F and 95°F.

How does Mega Fill Pro SPF reduce energy use in buildings?
Mega Fill Pro SPF:
• provides a continuous air barrier.
• prevents moisture infiltration through air leakage.
• minimizes dew point problems and condensation.
• can avoid thermal bridging.
• resists heat movement in all directions.
• provides reliable performance under varying conditions.

Can Mega Fill Pro SPF insulation help control moisture in my home?
Yes. Gaps and cracks in the building envelope can allow uncontrolled movement of moisture-laden air in and out of the building. Loss of interior moisture control can make the interior air excessively dry or moist, which can cause occupant discomfort, poor indoor air quality, higher heating and cooling costs to control moisture, and in some cases, hidden deterioration of the building and possibly mold and mildew growth. Air sealing these gaps and cracks with Mega Fill Pro SPF can help control interior moisture levels.

Do you need a vapor retarder or a vapor barrier with Mega Fill Pro SPF insulation?
It depends of the use of the building, the climate and the materials of construction. In general, SPF usually does require a vapor retarder of some degree on the warm side of the building assembly. A vapor barrier is defined as a Class I vapor retarder having a perm rating less than 0.1, such as a sheet of visqueen. Mega Fill Pro closed cell foams will achieve a Class II (0.1 < perm rating < 1) or Class III (1 < perm rating < 10) vapor retarder ratings depending on the specific product type as well as the applied thickness. Consult your local Building Code to determine which level of vapor retarder is required for your area.

Is Mega Fill Pro SPF waterproof?
Mega Fill Pro is closed cell and is water-resistant, but not waterproof. Minimal exposure to moisture will not affect closed cell foams; however the foam may be compromised if submerged under water for a period of time.

What is the difference between a vented and unvented attic?
Unvented (conditioned) attics use air-impermeable insulation as a barrier to prevent moisture condensation on the underside of roof decks. Vented attics minimize condensation by allowing the escape of moisture to the exterior by air flow.

If you spray the underside of a roof deck with Mega Fill Pro SPF insulation, do you need to vent the attic?
It depends of the use of the building, the climate and the materials of construction. The application of Mega Fill SPF insulation creates a thermal and moisture gradient that avoids the development of dew point conditions in the attic, virtually eliminating the possibility of moisture condensing or accumulating. This important performance characteristic, combined with the building type, climate and construction materials may allow you to utilize an unvented attic. It is best to consult with your design professional or insulation expert to assess your project and make recommendations whether or not you need to vent the attic.

Why do you need coatings or coverings over Mega Fill Pro SPF?
All closed cell SPF, like Mega Fill Pro, is water resistant as applied; however, the surface of all SPF types (open or closed cell) can deteriorate under the sun's ultraviolet (UV) rays. Typically, elastomeric coatings or aggregate coverings are used to protect the SPF against UV radiation in exposed applications.

Additionally, by code, all foam plastic insulations must be separated from the interior of the building by an approved 15-minute thermal barrier, such as ½” gypsum wall board or equivalent material, which may be in the form of an applied coating. For attics and crawl spaces that are accessed for service of utilities and maintenance only, and are not used for storage, you may use an ignition barrier (which may be in the form of an applied coating) in lieu of a thermal barrier. Please consult your local building department for assistance determining the requirements of your project.

Can I paint Mega Fill Pro SPF?
Yes, once the foam is fully cured it can be painted with any product that is not heavily saturated in MEK (Methyl Ethel Ketone). This should not be an issue in products made for interior/household applications. Other than the MEK concentration, the type of paint you use should be determined by the easiest method of application (paint, spray, etc) and the desired finish.

Does the SPF insulation in my home pose a fire hazard? Is it flammable?
TVM Mega Fill (DSF and RF series) SPF products contain flame retardants and are designed to meet applicable building and fire code regulations when installed properly.

Additionally, by code, all foam plastic insulations must be separated from the interior of the building by an approved 15-minute thermal barrier, such as ½” gypsum wall board or equivalent material, which may be in the form of an applied coating. For attics and crawl spaces that are accessed for service of utilities and maintenance only, and are not used for storage, you may use an ignition barrier (which may be in the form of an applied coating) in lieu of a thermal barrier. Please consult your local building department for assistance determining the requirements of your project.

Is Mega Fill Pro SPF a good soundproofing material?
Yes. Mega Fill Pro medium density SPF effectively reduce noise from outside sources by sealing cracks and gaps that allow sound to travel through the walls, floors and ceilings into the building.

Will I have a problem with insects attacking the foam?
Typically, SPF does not attract insects. Generally, it is known to be an effective impediment against insects and other pests because it can be used to seal the gaps from the outside where insects and rodents typically enter. Although SPF is not a food source for pests, some pests may chew through the foam over time.

How long will SPF insulation last? Does the foam degrade over time?
TVM Mega Fill Pro SPF insulation, when properly installed and protected is designed to last the lifetime of the structure it is in. One of the benefits of SPF insulation is that it resists structural deterioration and decomposition over time and resists settling.

Due to the large number of variables involving building conditions, installation conditions, and user qualifications, TVM warrants only that the product and equipment is free from defects in manufacture and workmanship at the time of purchase. Please see TVM’s 2 Component Limited Warranty, available at .

Are there any health hazards associated with Mega Fill Pro SPF?
Mega Fill Pro SPF does not contain any urea formaldehyde, VOCs, CFCs or Penta-BDEs. The use of proper Personal Protective Equipment (PPE) is required during application. Please see the MSDS and Operating Instructions for PPE guidelines.

Can I install two-component spray polyurethane foam insulation myself?
Although SPF may, in some instances, be available for purchase (and installation) by D-I-Y’ers, there are serious health considerations and very specific precautions that must be followed to safely apply SPF. Professional installers will have the appropriate training and protective gear (also called "personal protective equipment" or PPE), including respirators, to safely handle larger-scale SPF insulation jobs. Mid to larger-scale SPF insulation projects (e.g., walls, attics, roofs) using two-component systems are sophisticated applications best left to a trained SPF contractor or weatherization professional.

There are insulating foam sealant products available in cans for Do-It-Yourselfers at home improvement stores. These products are used for small "bead-type" applications, such as sealing windows, doors, and filling small gaps and cracks. Even when using these small can products, personal protective equipment to protect your skin, eyes, and breathing should be used.


Will TVM Polyurethane Foam prevent insects and rodents from entering the home?
Use TVM Polyurethane Foam sealant to seal gaps and cracks to prevent insects and rodents from entering the home. However, persistent pest may be able to chew through the cure foam.

What is the service temperature range of TVM Polyurethane Foams?
TVM Polyurethane foams will maintain its performance within the temperature range of -40°F - 194°F (-40C - 90°C).

Is TVM Polyurethane Foam ozone friendly?
TVM Polyurethane Foam sealant utilizes CFC-free propellants and therefore will not contribute to ozone depletion.

Is TVM Polyurethane Foam sealant waterproof?
TVM Polyurethane Foam sealant will form a water resistant and airtight seal when properly applied.

Is the performance of polyurethane foam affected by ultraviolet radiation?
Polyurethane foams will degrade when exposed to ultraviolet radiation. Protect cured polyurethane foam from ultraviolet radiation by painting or adding a top layer of ultraviolet radiation resistant sealant.

Is priming required?
Primers are not required.

How does TVM Polyurethane Foam sealant compare to other types of chemical insulation?
TVM Polyurethane Foam sealant expands to form a closed-cell solid with an outer skin layer, creating an excellent barrier against energy loss/air infiltration or moisture leakage while traditional caulks and sealants form a solid, heavy and non-insulating bond. This foam barrier will not shrink, dry or harden and will not pull away from the material it is bonded to. These characteristics combine to provide you with superior protection against air and moisture infiltration while reducing energy loss around your building.



Will a thicker layer of underlayment soften the feel of walking on the flooring?
No. Unlike carpet, a thicker layer of underlayment will not soften the feel of walking on the flooring. However, a thicker layer of underlayment will enhance sound deadening.

When do I need to use a moisture barrier?
A simple rule of thumb with the use of moisture barrier:
• Wood sub-floors do not require a moisture barrier (TVM Standard Underlayment)
• Wood sub-floors with crawl space will require a moisture barrier
• Concrete floor will require a moisture barrier (TVM 2-in-1 Underlayment) unless installed on the second floor or higher in a home or building

What is the function of underlayment?
Since wood or laminate flooring not directly attached to the sub-floor, underlayment is placed over the sub-floor first then the flooring is assembled on top of the underlayment. The underlayment acts as a cushion to help to deaden sound when walking on the flooring, absorb some minor imperfections in the sub-floor and slightly soften the feel when walking on the floor.

When is underlayment required?
Underlayment is required for any installation of engineered real wood flooring or laminate flooring.

What are the applications of TVM Extruded Foam products?
Two main component of TVM Extruded Foam products are Sill Seal and Underlayment.
TVM Sill Seal are used to seal and smooth imperfections between the seal plate and building foundation, creating an air tight membrane to protect the sill plate against rotting and air/moisture penetration into the building.TVM Underlayment is used for the installation of wood or laminate flooring.