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

Installation Options

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

How many pieces do I actually get for the $40

Asked by: Jay
Jay, I just told you what I estimated you'd get..this comes in a bundle each sheet is 2'wide x 4' L So, if you can figure above 50' total..I'd guess there would be 25 sheets per bundle
Answered by: AuntPaulette
Date published: 2018-02-14

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 i wrap my extirior and how can i with glue after intall can i put skim coat over

Asked by: Carlos
Dear Carlos: Improving insulation on your home before you install new stucco is a great idea! Thicker foam board is required however. We recently wrapped my own home with 2" thick Foamular foam board, which was a significant improvement. In addition to R-value, this will help you seal out air and water leaks, and break all of the 'thermal bridges' created by (formerly) exposed wood framing. Here are some tips: (1) Thickness to prevent condensation: The foam board must be thick enough to prevent condensation on the sheathing of your house during the winter -- which can lead to rot, particularly with cheap OSB sheathing. The required thickness depends on the climate zone you live in; a copy of the DOE / ASHRAE map is attached below. Here is a table with the minimum thickness of foam board depending on the zone you live in and the type of wall: Climate Zone Minimum R-Value of Foam Sheathing Marine Zone 4 R-2.5 for 2x4 walls; R-3.75 for 2x6 walls Zone 5 R-5 for 2x4 walls; R-7.5 for 2x6 walls Zone 6 R-7.5 for 2x4 walls; R-11.25 for 2x6 walls Zones 7 and 8 R-10 for 2x4 walls; R-15 for 2x6 walls We live in Massachusetts and wrapped the entire house with 2" of Foamular foam board. 2" = R-10, which is required in our area to prevent condensation. This also boosts insulation performance, so it is a win-win. A photo is attached. (2) Type of foam board: We prefer Foamular XPS foam board because it has a high R-value: R-5 per inch. In addition, XPS does not absorb water -- always a concern on exterior surfaces. Polyisocyanurate foam board provides slightly high R values, but absorbs water like a sponge. Researchers also recently found that the performance of polyiso foam board drops along with the temperature -- exactly what you do not want during the winter! Foamular XPS delivers equivalent R-value on cold winter days. See: Foamular 150 Model # 45W, Home Depot Internet #100320352 Store SKU #409926 (3) Installation order: Install Tyvek house wrap over your sheathing first -- then the foam board. See: Tyvek Model # D13499991, Home Depot Internet #100422450 Store SKU #641398 Carefully tape and seal the Tyvek to block air and water leaks. Use special Tyvek tape for joints. See: Tyvek tape Model # D13841470, Home Depot Internet #100422453 Store SKU #176886 We also carefully seal the top edge with DAP 3.0 sealant, to provide extra protection against water. Then install the foam board. After your foam board is up, install 1x4 wood strapping as the nailing surface for your new siding or metal scrim for stucco. A photo is attached. (4) Stop air leaks: Carefully seal all of the joints and edges of the foam board to block air leaks. A thick layer of DAP 230 sealant is best for small gaps; use DAP 3.0 if the temperature is below 45 degrees. The 'Window and Door' version of Great Stuff foam is a good solution for larger gaps; the cured foam remains flexible to stop cracks as things expand and contract. Carefully seal the top edge to stop water from trickling behind the foam board. (5) New trim: If you wrap your house with foam board, you will also need to replace the trim around windows and doors. Use Home Depot's Veranda PVC trim boards instead of wood. PVC never rots and never needs to be repainted -- as long as you want white trim. If you do want a different color, the PVC surface is much better for paint than wood. It cuts and installs easily; always use stainless screws to avoid any rust spots down the road. Use CorTex screws; caps are included to fill the screw holes. See: Veranda Model # H190OWS3, Home Depot Internet # 100244007 Store SKU # 254294 and Cortex Model # FMCTXT-VA50SMHD, Home Depot Internet #203705494 Store SKU #822865 Store SO SKU #336802. A photo is attached of a recent project, where we wrapped the house with 2" Foamular, then replaced all of the trim with Veranda PVC. Great stuff! Also take a look at air leaks into your attic and the insulation in your attic. ~60% of the heat lost in an average home goes through the roof. If you can see the top of the joists in your attic, you definitely need to add more. Here are the recommendations for climate zones in the USA: Zone Attic insulation 2 R30 to R60 3 R30 to R60 4 R38 to R60 5 to 8 R49 to R60 I hope this is helpful. Mark
Answered by: Bvillebound
Date published: 2018-05-12

Hi Corning, Will this material dissolve if glued with West System (2-part) epoxy resin?> I want t...

Hi Corning, Will this material dissolve if glued with West System (2-part) epoxy resin?> I want to see if I can make a small lightweight dinghy row boat (~7'6" long) with this sheet instead of plywood. To give it strength, I would make the component panels as a 2-layer sandwich with fiberglass cloth and epoxy resin as follows: FG-cloth/FOAMULAR/FG-cloth/FOAMULAR/FG-cloth. I would end up with a total thickness of about 5/8". It would be about 25% the weight of the same boat composed of 3/8" plywood panels with two layers of FG-cloth.
Asked by: sailor
Dear Sailor: Plywood is intended to provide dimensional strength and rigidity. This 1/4" foam board product provides neither. So you cannot use it in place of plywood to save weight. I hope this is helpful. Mark
Answered by: Bvillebound
Date published: 2018-05-09
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Customer Reviews

FOAMULAR 1/4 in. x 4 ft. x 50 ft. R-1 Fanfold Insulation Sheathing is rated 4.7 out of 5 by 15.
Rated 5 out of 5 by from I have used this product in the past... I have used this product in the past & still find it easy to work with and when you have little income and several areas you need to block the wind and air , this product works perfectly for me. I used this to block off where an inside door use ro be (added on utility room with no heat)..I also used it as skirting around the trailer; It has made a differance
Date published: 2018-03-18
Rated 5 out of 5 by from Used as a thermal barrier on an addition that I was remodeling. We had a choice of heated trim bo... Used as a thermal barrier on an addition that I was remodeling. We had a choice of heated trim boards or insulating. Wasnt cost effective for client to have gutted for install. . so we used this insulation sheeting and have found that it works well as barrier.. no need to add heat as now home furnace can heat throughout.
Date published: 2018-03-06
Rated 5 out of 5 by from This insulation is Great for my uninsulated garage door, fits right in the slots and for the base... This insulation is Great for my uninsulated garage door, fits right in the slots and for the basement walls before I stud them, a little pricey, but still works the way it's suppose to, makes a great vapor barrier !!
Date published: 2018-05-10
Rated 5 out of 5 by from Used this as an additional layer of insulation on top... Used this as an additional layer of insulation on top of framed sections of trailer walls --- seals the drafts, easy to work with, versatile applications, handy storage with the folded feature.
Date published: 2018-01-13
Rated 5 out of 5 by from Worked great for my obscure purpose of insulating reptile tanks from the outside. Only complaint... Worked great for my obscure purpose of insulating reptile tanks from the outside. Only complaint is I wish it came in 2x4 pieces. Only need 6ea 2x4 sections. I still have 38 feet left LOL.
Date published: 2018-04-03
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 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
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