Model # 21UM

Internet #100320301

Store SKU #409692

Owens Corning FOAMULAR 1/4 in. x 4 ft. x 50 ft. R-1 Fanfold Insulation Sheathing
0748232100050

Owens Corning

FOAMULAR 1/4 in. x 4 ft. x 50 ft. R-1 Fanfold Insulation Sheathing

  • Film faced, flat uniform surface for easy installation
  • Perforated to permit water vapor to pass through the board
  • Designed to help reduce gaps and to eliminate drafts
$4600 /each

Choose Your Options

Product Thickness (in.)
.25 in
Product Length (ft.)
50
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Frequently Bought Together

Product Overview

  • Film faced, flat uniform surface for easy installation
  • Perforated to permit water vapor to pass through the board
  • Designed to help reduce gaps and to eliminate drafts
FOAMULAR Extruded Polystyrene (XPS) Rigid Foam Insulation offers a comprehensive line of products in a wide choice of sizes, thicknesses and edges with a lifetime limited warranty for the life of the home or building. The products are easy to handle, score, cut and install and no special tools are needed. Products can be used on wood, steel framing or concrete walls. FOAMULAR XPS resists moisture and retains R-value even after exposure to standing water and wet soil. Only XPS foam to be GREENGUARD gold certified and the first XPS foam certified by Scientific Certification Systems (SCS) to contain a minimum of 20% recycled content.
  • Dimensions: 1/4 in. x 4 ft. x 50 ft.
  • Application: backer board for under new or replacement siding
  • Closed cell lightweight foam board
  • Thermal performance of R1
  • Buying guide and insulation calculator:

    insulation buying guide
    Insulation calculator button

Product Overview

  • Film faced, flat uniform surface for easy installation
  • Perforated to permit water vapor to pass through the board
  • Designed to help reduce gaps and to eliminate drafts
Model #: 21UM
Sku #: 409692
Internet #: 100320301

FOAMULAR Extruded Polystyrene (XPS) Rigid Foam Insulation offers a comprehensive line of products in a wide choice of sizes, thicknesses and edges with a lifetime limited warranty for the life of the home or building. The products are easy to handle, score, cut and install and no special tools are needed. Products can be used on wood, steel framing or concrete walls. FOAMULAR XPS resists moisture and retains R-value even after exposure to standing water and wet soil. Only XPS foam to be GREENGUARD gold certified and the first XPS foam certified by Scientific Certification Systems (SCS) to contain a minimum of 20% recycled content.

  • Dimensions: 1/4 in. x 4 ft. x 50 ft.
  • Application: backer board for under new or replacement siding
  • Closed cell lightweight foam board
  • Thermal performance of R1
  • Buying guide and insulation calculator:

    insulation buying guide
    Insulation calculator button

Info & Guides

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Specifications

Dimensions

Product Depth (in.)
0.25
Product Height (in.)
600
Product Length (ft.)
50
Product Thickness (in.)
.25 in
Product Width (in.)
48

Details

Faced or Unfaced
Unfaced
Insulation Application Type
Re-Siding
Insulation R-Value
1
Insulation Type
Sheathing
Interior/Exterior
Exterior
Product Weight (lb.)
13.2lb
Sheathing Type
XPS
Structural
No

Warranty / Certifications

Warranty Information
Lifetime Limited

Specifications

Dimensions

Product Depth (in.)
0.25
Product Height (in.)
600
Product Length (ft.)
50
Product Thickness (in.)
.25 in
Product Width (in.)
48

Details

Faced or Unfaced
Unfaced
Insulation Application Type
Re-Siding
Insulation R-Value
1
Insulation Type
Sheathing
Interior/Exterior
Exterior
Product Weight (lb.)
13.2lb
Sheathing Type
XPS
Structural
No

Warranty / Certifications

Warranty Information
Lifetime Limited

Questions & Answers

Is this product perforated to allow moisture vapor to escape?

Asked by: SHB
do H D install this insulation need for garage ceiling
Answered by: babs
Date published: 2017-09-15

Can Owens Corning foamular be used behing electric in wall fireplace

Asked by: H7
Dear H7: NO! All versions of foam board are flammable and should never be installed near any source of heat, e.g. an in-wall fireplace. This 1/4" thick product would also provide almost no insulation unless you use multiple layers. One layer only provides R-1. Insulation effectiveness depends on the thickness. The best option to insulate your fireplace is Roxul rock wool, which is fire resistant and provides R-4.2 per inch of thickness. Home Depot sells two versions -- Comfortbatt, which you can use to fill the bays between wall studs and stuff into spaces, and ComfortBoard, a board-like version that you can mount on a wall. See: Roxul Comfortbatt, Home Depot Model # RXCB351525 Internet #202090820 Store SKU #974419, and Roxul ComfortBoard, Home Depot Model # RXCB11224 Internet #206789748 Store SKU #1001748089 Be sure to read the installation instructions for the clearance required between the sides of the fireplace and combustible materials like the wood studs in your wall. I hope this is helpful, Mark
Answered by: Mark
Date published: 2017-09-14

Can this be used on the walls of a nursery for added warmth?

I want to make sure my babies nursery is warm enough. Right now the walls are painted, but the room is chilly. I would like to make a nursery out of this room if it can be warm enough.
Asked by: catherine
Dear Catherine: No. First, this product is too thin to provide effective insulation to keep your nursery warm. Second, foam board is very flammable and must be covered by a thermal barrier in any living space, garage, storage area, etc. The standard thermal barrier is 1/2" drywall. Insulating an existing room can be a challenge. A few tips: (1) If you own this home, the best option is to remove the interior drywall from exterior facing walls and fill the stud bays with Roxul ComfortBatt -- which provides R4 per inch. (Roxul is not flammable.) If you live in an area with cold winters, also add a layer of insulation board over the studs, e.g. Roxul ComfortBoard. Wood is a surprisingly good conductor of heat / cold, and this will break the thermal bridge between the wood and your nursery. Then install new drywall. See: Roxul ComfortBoard Model # RXCB11224 Home Depot Internet # 206789748 Store SKU # 1001748089, and Roxul Model # RXSS31525 Home Depot Internet # 202531875 Store SKU # 982937 (2) If this nursery is located over an uninsulated garage or crawl space. insulate this as well, and seal it to block air leaks. You can use ComfortBatt and ComfortBoard, just like the walls. (3) Most of the heat in a room is lost through the ceiling. If there is an attic above the nursery, first block all air leaks -- e.g. around recessed lights -- then fill the joist bays with ComfortBatt. If you have recessed lights, cover them in the attic with Tenmat covers, and seal the edges to prevent any air leaks. See: Tenmat Model # FF130E Home Depot Internet # 204286308 Store SKU # 1000012747, sealed with DAP 230, Model # 18275 Home Depot Internet # 100035980 Store SKU # 284425 Best of luck with this project! Mark
Answered by: Mark
Date published: 2017-07-22

What would be best to attach this to the underside my crawlspace? (Nails screws or adhesive)

Asked by: Joe
Dear Joe: No. This product is too thin to provide effective insulation -- just 1/4" with R1. The best option for your crawlspace is polyiso foam board, e.g. TUFF-R Model # 268441 Home Depot Internet # 100322376 Store SKU # 163832 This 1 7/8" thick board will provide R12. Install it with standard screws. Carefully seal all of the edges and joints to block air leaks. The 'Windows and Doors' version of Great Stuff works well; the cured foam remains flexible to avoid cracks as things expand and contract. I hope this is helpful. Mark
Answered by: Mark
Date published: 2017-07-22
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Customer Reviews

FOAMULAR 1/4 in. x 4 ft. x 50 ft. R-1 Fanfold Insulation Sheathing is rated 4.5 out of 5 by 10.
Rated 3 out of 5 by from Okay product. Not what I expected, as previous fanfold... Okay product. Not what I expected, as previous fanfold was thicker, with foil backing. Better than nothing as a backing for siding. Provides an essential wind and moisture barrier between siding and insulation. Watch out for bundles with exterior sections broken or crushed.
Date published: 2017-11-07
Rated 5 out of 5 by from 5 Star Review Rating provided by a verified purchaser
Date published: 2017-07-26
Rated 4 out of 5 by from 4 Star Review Rating provided by a verified purchaser
Date published: 2017-10-04
Rated 5 out of 5 by from Excellent, easy application Definitely noticed a difference in warmth of my house. I used house wrap combined with this product on the outside of my house underneath the siding. Make sure to install with roofing nails and tape the adjoining seems. You will notice the interior walls to be warmer, less heat transfer saving you money on heating and cooling costs. Came in handy since I live in New York.
Date published: 2013-01-21
Rated 5 out of 5 by from very easy to use, excludes the cold We used this insulation on our cellar floor, between Dricore floating subfloor and 1/4inch plywood. This is an off market use, but we couldn't use a thicker insulation due to the ceiling height of 7 feet and concerns about stair riser heights. We are very pleased with the decreased chill from the concrete underneath, much better than the Dricore alone.We taped all the seams and stapled it down to the Dricore it a a breeze to fit due to the fan folds. Wish we had something else we could use this material for.
Date published: 2014-11-18
Rated 4 out of 5 by from Project (add rigid insulation while residing TH). No one Home Depot could supply entire quantity.... Project (add rigid insulation while residing TH). No one Home Depot could supply entire quantity. I had to obtain from three different stores. 15% of the bundles had some damage. Some of the bundles were wrapped too tight by mfg. Other damage was from poor storage. Cannot yet say about what difference the added insulation makes. May be another month before job is completed. Happy to say that the customer service at each of the Home Depots was very good, polite and accommodating.
Date published: 2016-10-25
Rated 5 out of 5 by from Excellent inside and out: use with house wrap outside Inside: covered fanfold in colorfully material to block windows' winter cold during night. Also used for privacy screen, I Covered the fanfold with tissue paper and paint to keep the privacy screen light weight. Such a handy item for many uses
Date published: 2014-08-17
Rated 5 out of 5 by from I'm still waiting to have it installed but I am very happy with my purchase. I am replacing my ol... I'm still waiting to have it installed but I am very happy with my purchase. I am replacing my old insulation where I had work done and they didn't insulate it good. I have used owens corning for years.
Date published: 2017-04-25
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