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We’ve chosen to manufacture the Thermalid with Modified Expanded Polystyrene (EPS) LG R-320 foam because of its fire performance, structural performance, and environmental advantages. UL ratings on this product is available upon request. This modified ESP meets the National Building Code requirement for products used in the attic. Modified EPS contains no formaldehydes or toxic chemicals, and uses fewer resources to manufacture than other insulation products. EPS provides you with superior thermal performance to better insulate your home and no harmful CFC’s have ever been used to manufacture it.

Expanded Polystyrene (EPS) Facts

EPS is manufactured from expandable polystyrene beads containing a hydrocarbon blowing agent and a flame-retardant additive. It is a closed cell, lightweight, resilient, foamed plastic composed of hydrogen and carbon atoms. There are two common types of polystyrene foam, Extruded Polystyrene or XEPS (popularly known by it's Dow trademark, Styrofoam) and Expanded Polystyrene (EPS). Both expanded polystyrene and extruded polystyrene are used extensively as thermal insulation in industrial, commercial and residential construction.

During the processing of EPS, steam heat softens the beads and causes the blowing agent to expand to produce moisture-resistant multi-cellular particles which increase in size up to 40 times their original volume.

Following a period of stabilization, during which time the beads lose their moisture, the blowing agent condenses out and air diffuses into their cellular structure, the pre-expanded beads are molded into the Thermalid.

The benefits of EPS thermal insulation products are it's lightweight, has stable long term thermal resistance, no R-value loss over time (Source: 1985 Study conducted by Structural Research, Inc. for NRCA, MRCA, and SPI) , and cost effectiveness when compared to other rigid board insulations on the basis of R-value.

Is EPS a water, vapor or air barrier?

EPS is considered water resistant and vapor permeable and at the density and thickness of the Thermalid, the material acts as both a vapor retarder and an air barrier. This characteristic essentially eliminates air infiltration in all seasons which is recognized as a major cause of loss of conditioned air in your home.

Is EPS foam toxic?

EPS is an inert, non-biodegradable organic plastic foam which will not rot and is highly resistant to mildew. According to National Bureau of Standards Combustion Tests, data collected from seven labs concluded that under the worst case fire scenario, fumes from EPS are no more toxic than those from wood (Douglas Fir).

Product Specifications

Material: Molded Modified Expanded Polystyrene 2 1/4" thick  

Fits: Standard 25 1/2" x 54" rough openings

Inside measurements: 28"W x 56"L x 8 7/8"D

Outside measurements: 32"W x 60"L x 11 1/8"H

R-Value: R-9, plus creates over 16" of dead air space

Weight: <14 lbs. for magnetic type and 12 lbs. for non-magnetic type

Shipping: Box ships as a 32" x 32" x 16" with a 50lb shipping rate.

Sealing

Magnetic Gasket: Made of flexible PVC material with four metal strips to seal to the floor with instructions.

                                    OR

Rubber Straps: Made of EPDM (will not dry rot), temperature rating -60 to 300F with foam weather-stripping around the perimeter. 

Additional Hardware: 4 eyebolts, 8 Fender washers, 4 machine nuts, 4 EPDM (Rubber straps), 4 nails, 1 roll weatherstripping and 1 set of instructions.