Model # 150705

Internet #205517302

Store SKU #420777

Cellofoam 3/4 in. x 1.21 ft. x 4 ft. R-3 Polystyrene Insulating Sheathing (6-Pack)


3/4 in. x 1.21 ft. x 4 ft. R-3 Polystyrene Insulating Sheathing (6-Pack)

$890 /package

Frequently Bought Together

Product Overview

Provide your home with effective insulation with the Cellofoam 3/4 in. x 14-1/2 in. 48 in. Polystyrene Foam Insulation Panel. Ideal for both interior and exterior use. This durable insulation features a flame retardant additive for additional safety.

  • Ideal for wall cavity insulation
  • ENERGY STAR compliant
  • Utilize the rigid polystyrene material for other uses such as arts and crafts, bulletin boards and games
  • Contains a flame retardant additive
  • How much do you need? Let our calculator help:
    Insulation calculator button

Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

Type of Polystyrene

Is this considered “extruded polystyrene" or "expanded polystyrene"?
Asked by: NickyJ
The other person who responded is correct that it's EPS, but significantly, is incorrect about the general superiority of XPS over EPS. I'm not sure about the R-value per inch question (though I think they're very similar), but while XPS may be superior in some other respects, EPS does have the significant advantage of being *more* moisture-resistant over time than XPS and and partly as a result, it maintains its R-value better, again, over time. Bear in mind that short term tests may show the opposite. XPS has greater short-term moisture resistance but, while it absorbs moisture moisture, it also releases it slowly, so it will build up over the long run to a greater extent in XPS insulation than in EPS. Long-term, "real world" testing of in-use material demonstrates the superior R-value retention of EPS when both are exposed to moisture. This may or may not be relevant to a given use, but is worth keeping in mind.
Answered by: Mike
Date published: 2017-05-06

Is the price per panel or per package for this item?

Asked by: rosehips
it's per package, rosehips.
Answered by: TacomaSam
Date published: 2015-11-21

Can I use this as a basement insulation?

Asked by: Joe
Dear Joe: Yes. Here are some installation tips: t would be best to use foam board without foil facing -- which would create a vapor barrier. Your basement walls need to be able to dry slowly toward the inside, with a vapor retarder. 2" thick panels of foam board, for example, would provide R-8 to R-10 insulation and function as an effective vapor retarder. I recommend Foamular; see: Foamular Model # 52DD, Home Depot Internet #202085962 Store SKU #307101 Here are some more suggestions: (1) Insulate and seal your walls: Using foam board compatible glue, fasten sheets of foam board to your concrete walls. Apply a thick bead around the perimeter of each sheet, to create an air seal when it is pressed against the concrete wall. See: Loctite PL300 Model # 1421941, Home Depot Internet #202020476 Store SKU #780400. You can lean a 2x4 against each sheet to hold it in place while the glue sets, or pin them in place with a RamSet. After all of the sheets of foam board are installed, seal all of the joints and edges to block air leaks. DAP 230 works well for joints and small gaps; the 'Window and Door' version of Great Stuff foam is good for larger gaps. (2) Build your new 2x interior wall in front of the foam board. This will give you a nice straight wall, plus room to run electric wiring. Use pressure treated (PT) lumber for the sole plate. If water leaks could occur and the floor may be damp, install a piece of Veranda cellular PVC trim on the floor first, to keep the floor plate from rotting; leave small gaps every few feet for water to trickle through under the DriCore panels noted below. Use a RamSet to drive nails into the concrete, or drill holes for expansion bolts. We use bolts in areas with high stress, e.g. near doorways, stair landings and the ends of pony walls. See: RamSet Model # 00022, Home Depot Internet #100091715 Store SKU #107708. Be sure to wear ear and eye protection when you use a RamSet. (3) Insulate and seal the rim joist pockets: Install 2" thick pieces of Foamular 250 in the pocket at the end of each floor joist -- to insulate and seal the rim joist. Seal the edges with the 'Window and Door' version of Great Stuff foam. Then fill the rest of the end of each bay with Roxul rock wool. (4) Add more insulation: If you live in an area with cold winters, fill the stud bays with Roxul rock wool to boost the total insulation. See: Roxul ComfortBatt Model # RXCB351525, Home Depot Internet #202090820 Store SKU #974419 (5) Seal and insulate the floor: Install 1" thick sheets of Foamular 250 on the floor, and carefully seal the edges and corners to block air leaks. (Foamular 250 has sufficient "compressive strength" for residential floors and insulation under concrete slabs.) Then seal the joints and edges carefully to block air and moisture leaks. Use DAP 230 between the joints and for small gaps. The 'Window and Door' version of Great Stuff spray foam is good for larger gaps. Then install sheets of 3/4" plywood on top of the foam board, running at a right angle to the foam board. Leave a 1/8" gap between the sheets and at the edges, to allow for expansion. Carefully seal all of the joints and edges of the plywood to block air / moisture leaks. If there is any possibility of a water leak into your basement, however, install DriCore panels first. They have a rubber surface on the bottom with channels that water can trickle through. Make sure, of course, that you have a drain with a dry well or sump pump for the water to escape to. Carefully seal all of the joints and edges of the DriCore panels to block air / moisture leaks. Then install 1" of Foamular on top of the DriCore followed by 3/4" plywood, if you have sufficient ceiling height. See: DriCore Model # CDGNUS750024024, Home Depot Internet #202268752 Store SKU #361018. We installed DriCore at a recent project as a fail-safe, even though the basement was dry. Water leaked in unexpectedly through a window during a downpour, and DriCore saved the new floor. (6) Also read up on fire blocking, which many people overlook. This is required at the top of basement walls, along the walls, at the top of stairs, etc. Do a Google search for "How to Firestop Your Basement" from ContractorKurt. Roxul rock wool is a good solution. You can stuff it into the gap at the top of the wall and into the end of floor joist bays. To seal holes created for pipes and wiring, use fire resistant caulk, e.g. 3M Model # CP-25WB+, Home Depot Internet #100166701 Store SKU #163096.. DO NOT use the "Fireblock" version of Great Stuff foam; believe it or not, all versions of Great Stuff ignite at just 240 degrees F, which is significantly lower than the ignition temp for wood studs. I hope this is helpful. Mark
Answered by: BvilleBound
Date published: 2017-04-28

Does anyone know if you can paint these panels?

Does anyone know if you can paint these panels?
Asked by: KM
Dear KM: Yes, standard latex paint will work if you apply a primer first. More important, however: foam board is flammable and emits toxic gas when it burns. It MUST be covered by an approved 'thermal barrier' in every home, garage, basement and attic storage area. So it cannot be left exposed and painted. I hope this is helpful, Mark
Answered by: BvilleBound
Date published: 2017-03-29
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Customer Reviews

3/4 in. x 1.21 ft. x 4 ft. R-3 Polystyrene Insulating Sheathing (6-Pack) is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by from Product was perfect for my project Product was perfect for my project
Date published: 2017-02-28
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