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How To Insulate Joist Ends Using Spray Foam

Shannon from http://www.house-improvements.com/forums/ shows you how to insulate joist ends using a DIY spray foam insulation product. If you have any questions on your DIY project head over to the forum on our website to get answers. Video © 2014 SKS Media.

Videos produced by SKS Media (House-Improvements.com) are provided for informational purposes only. The information contained in the videos is intended to give general guidance to simplify DIY (do it yourself) projects. Because tools, products, materials, equipment, techniques, building codes and local regulations are constantly changing, SKS Media cannot and does not assume any responsibility or liability for the accuracy of the information contained therein. Further, SKS Media will not accept any claim for liability related to, but not limited to, omissions, errors, injury, damage or the outcome of any project. It is the responsibility of the viewer to ensure compliance with all applicable laws, rules, codes and regulations for a project. The viewer must always take proper safety precautions and exercise caution when taking on any project. If there are any questions or doubt in regards to the element of a project, please consult with a licensed professional. SKS Media conducts all matters in accordance with the laws of Saskatchewan, Canada.


  1. Maxid1
    Feb 13, 2014

    What’s the expansion ratio for a foot per second spray rate (that looks
    like about how fast you’re moving) The specs show how many board feet it
    will cover, but they don’t show how thick that coverage is. In the other
    video you looked like you were getting less that an inch expansion since
    you were spraying twice to fill your 2×2 voids.

  2. Cumbriahandyman
    Feb 13, 2014

    Does that foam have any effect on the electrical insulation of the wires?
    Here in the UK some foams are not permitted to cover or touch cables.

  3. laserguy
    Feb 13, 2014

    I’m getting ready to insulate a 10 x 10 room so I’ve already checked all
    this stuff out. According to packaging you get 200 sq ft at 1″ thick.
    That will give you a R7 value. That means you will need at least 2 coats
    and maybe 3 in some areas in order to get a good R value. Keep in mind
    that this stuff sells at the big box store for $350+ for one kit. Because
    you have to make multiple passes to get good coverage, that 200 sq ft drops
    to around 80sq ft or so or think of it as a 8 x 10 ft wall. Multiply that
    times 4 walls and cost of insulating room is $1400. You can get R13
    fiberglass wall batts (7.5 batts to a 10 ft wall) for less than $50.
    Total cost of room, under $200. That’s the problem with this spray on
    insulation. It cost too damn much for what it does. Until prices come way
    down, most diy homeowners are never going to pay the cost of using it. Of
    course the companies that tout it don’t care about the price as they’re
    gonna pass the cost along to their customers and for them, it makes the job
    easier. They make same money at less effort. 

  4. Chad S
    Mar 17, 2014

    Where did you order your spray foam from?

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