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Questions and Answers for Owens Corning FOAMULAR 1/4 in. x 4 ft. x 50 ft. R-1 Fanfold Rigid Foam Board Insulation Sheathing

Internet #100320301

Model #21UM

Store SKU #409692

FOAMULAR 1/4 in. x 4 ft. x 50 ft. R-1 Fanfold Rigid Foam Board Insulation Sheathing
(137)Questions & Answers (147)
  • Saves energy and resists moisture with limited lifetime warranty
  • Reduce gaps and eliminate drafts with film faced uniform surface
  • Folded hinge at 24' intervals to ease application at job site
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Questions & Answers

147Questions
caret
Q:Ok under my exposed deck I put batting insulation in between the joists. Kraft in facing down or exposed to outside. I’m just looking for a little extra r value plus sometime to hold the batting up better. Can I use the fan fold to do that? Dangerous?
by|Apr 5, 2024
1 Answer
Answer This Question

A:  Hello Brandon, to better answer your question we will need some additional information. Please contact Owens Corning at 1-800-Get-Pink (438-7465) or Answers.Insulation@Owenscorning.com. Thank you for your inquiry!

by|Apr 9, 2024
    caret
    Q:Is it worth gluing this product to block walls prior to studding, insulating and drywall? My house is brick and block with no insulation. I have sealed the block walls to date and ready to start framing.
    by|Mar 24, 2024
    1 Answer
    Answer This Question

    A:  Hello Mike, Foamular Fanfold may not be the best option for this application as it is designed to be a backer board prior to residing. This is a perforated product that has an R-value of R-1. Owens Corning Foamular NGX 150 or NGX 250 at 1"-2" thick may be a better option as it has an R-value of R-5 per inch. Thank you for your inquiry!

    by|Mar 25, 2024
      caret
      Q:Can this be used on concrete basement walls and drywall over it
      by|Mar 1, 2024
      1 Answer
      Answer This Question

      A:  Hello Bill, The FANFOLD foam residing board is intended for application as a backer board for residing applications where it provides a flat uniform surface for the application of new siding products during remodeling for use in residential and commercial exterior wall construction. Please contact Owens Corning at 1-800-Get-Pink (438-7465) to discuss options for your needs. Thank you for your inquiry.

      by|Mar 1, 2024
        caret
        Q:Can this be used a a underlayment below vynal luxury planking
        by|Mar 18, 2023
        2 Answers
        Answer This Question

        A:  Hello Lee01330, Owens Corning FanFold Residing board is not designed or tested for use as flooring underlayment and we do not have recommendations for this application. Thank you for your inquiry!

        by|Mar 20, 2023

          A:  I do not think so, too soft.

          by|Mar 21, 2023
            caret
            Q:Can you use this product on exterior 1/2 inch plywood sheeting and then a house wrap prior to installing hardiboard siding? Thanks so much!
            by|Mar 16, 2023
            1 Answer
            Answer This Question

            A:  Hello Moose, While Foamular FanFold can be installed over plywood sheathing prior to installing siding, its intended purpose is to be used as a residing board to provide a smooth surface to install new siding over existing. The 1/4" thickness will only provide a R-value of 1. We also suggest checking with Hardie to determine their installation requirements. Thank you for your inquiry!

            by|Mar 16, 2023
              caret
              Q:Can this be used under carpet on a basement concrete floor?
              by|Jan 24, 2023
              1 Answer
              Answer This Question

              A:  Hello Bill, We cannot provide recommendation for the use of FanFold in this application. Thank you for your inquiry!

              by|Jan 24, 2023
                caret
                Q:What is the our value of fanfold quarter inch
                by|Jan 16, 2023
                1 Answer
                Answer This Question

                A:  Hello KMww, the 1/4" FanFold has a R-value of R-1. Thank you for your inquiry!

                by|Jan 17, 2023
                  caret
                  Q:My bedroom is cantilevered. Can I use this foam under soffit. It would be installed over plywood and covered with vinyl soffit
                  by|Dec 4, 2022
                  1 Answer
                  Answer This Question

                  A:  Hello JamesT, You can use Foamular in this location, but ¼” will be of minimal benefit. You also will want to ensure that the cavities under the cantilevered part are blocked at the wall/foundation below to prevent exterior air from going into conditioned or partially conditioned space within the cavities. Thank you for your inquiry!

                  by|Mar 6, 2023
                    1 found this answer helpful
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                    Product Thickness (in.)

                    0.25 in

                    2 in

                    1 in

                    Insulation R-Value

                    R1

                    R10

                    R5

                    Insulation Location

                    Re-Siding

                    Basement, Crawlspace, Exterior Wall Foundation, Under Slab

                    2x4 Wall, 2x6 Wall, 2x8 Wall, Attic, Basement, Ceiling Insulation, Exterior Sheathing, Garage, Interior Wall, Metal Building, Re-Siding

                    Insulation Features

                    Formaldehyde Free

                    Formaldehyde Free, Moisture Retardant, Mold Resistant, Water Resistant

                    Formaldehyde Free, Vapor Retardant

                    Sheathing Type

                    XPS

                    XPS

                    EPS