Q: What are the recommendations for vents when using the Joist Pocket Liner®?
Q: Does use of the Joist Pocket Liner® affect clearance from joist to grade?
Q: What information does a concrete sub-contractor need to accurately install the Joist Pocket Liner®?
Q: Is The Joist Pocket Liner®, (JPL), hard to install?
Q: Does this system require ICBO evaluation and testing?
Q: Is this product similar to a hanger?
Q: In what sizes are JPLs available?
Q: Will the JPL deteriorate in the concrete?
Q: Will moisture accumulate in the JPLs?
Q: Are JPLs available for 45-degree angled walls, such as under bay windows?
Q: What if the foundation crew doesn't install the JPLs exactly on layout?
Q: How do the joists attach to the JPLs?
Q: Is there any way to provide lateral stability after the joists have been installed, but before the subfloor has been nailed on?
Q: Will the JPLs eliminate squeaks in floor systems?
Q: Will using JPLs save me money?
Q: Will using JPLs increase production?
Q: Do JPLs provide proper joist bearing?
Q: What Causes a Squeaky Floor?
Q: What if my question isn't answered here?




Q: What are the recommendations for vents when using the Joist Pocket Liner®?
A:
    		• Place as many vents as possible on the wall parallel to joist direction
    		• Where joist layout interferes with vent location, support joist with post-to-foundation footing. See CAD Details for more information.
    		• Vents that fit between narrow and on-center (o/c) spacing joists (19.2" o/c, 16" o/c) are available. Contact JPL Enterprises for more information.
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    Q: Does use of the Joist Pocket Liner affect clearance from joist to grade?
    A: Required clearances can be achieved with use of post or pony wall as the interior joist support.
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    Q: What information does a concrete sub-contractor need to accurately install the Joist Pocket Liner®?
    A: Framer provides joist layout to concrete sub-contractor. Actual Joist Pocket Liner® installation is easy.
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    Q: Is The Joist Pocket Liner® (JPL), hard to install?
    A: No. JPLs come with (2) pre-installed nails and a center mark to help with layout.
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    Q: Does this system require ICBO evaluation and testing?
    A: No. Pockets formed in the foundation have been around for many years, and are recognized by the Uniform Building Code nationwide. Our product is non-structural. However, we have obtained ICBO approval. See ICBO report ER-5827 (PDF Format, 37K).
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    Q: Is this product similar to a hanger?
    A: No. The concrete provides all the bearing requirements for the floor joists.
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    Q: In what sizes are JPLs available?
    A: Our JPL 2-9 is designed to receive 9 1/2" I-joists with a flange width of either 1 1/2" or 1 3/4". Our JPL 2-11 is designed to receive 11 7/8" I-joists, with a flange width of either 1 1/2" or 1 3/4". Our JPL 25-11 is designed to receive 11 7/8" I-joists with a flange width of between 2" and 2 1/2".
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    Q: Will the JPL deteriorate in the concrete?
    A: No. JPLs are molded out of high-density polyethelyne, the same material used for containers that hold chemicals, (gasoline, paint thinner, lacquer thinner, muriatic acid, etc.). This is the same material that you are asked to recycle because it is not biodegradable and will not deteriorate in sanitary landfills.
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    Q: Will moisture accumulate in the JPLs?
    A: No. Crawl spaces are typically ventilated and any moisture that does accumulate will be allowed to evaporate. The JPLs are made of high-density polyethelyne and provide a moisture barrier to the porous concrete foundation wall and meet all code requirements for vapor barriers.
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    Q: Are JPLs available for 45° angled walls, such as under bay windows?
    A: Framers will normally put a post under I-joists that connect at an angle to the foundation wall. JPL can provide several additional alternative details for 45° conditions.
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    Q: What if the foundation crew doesn't install the JPLs exactly on layout?
    A: If the location of the JPL interferes with layout, several options can be used to overcome this. These options include posting, pony walls, ledgers and hangers. In the event that none of these options seem feasible, the framer can always trim back the affected row of subfloor.
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    Q: How do the joists attach to the JPLs?
    A: We recommend a small amount of construction adhesive in the seat of the JPL. Structurally, connectors, such as nails, are not needed. Connection is provided by the subfloor nailing to the joists and the mudsill.
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    Q: Is there any way to provide lateral stability after the joists have been installed, but before the subfloor has been nailed on?
    A: Yes, Each JPL comes complete with a clip that provides two functions. The first of which prevents the JPL from compressing under the pressure of the concrete as it is being poured into the forms. The second function of these clips is to provide lateral stability to the I-joists after installation.
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    Q: Will the JPLs eliminate squeaks in floor systems?
    A: Yes. Squeaks most often occur as a result of improperly installed fasteners which allow joist movement. JPLs do not use fasteners.
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    Q: Will using JPLs save me money?
    A: Yes. Depending on which type of floor system you currently use, the savings between material and labor costs can be significant. Consult your JPL representative for which floor system will be optimal for your situation.
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    Q: Will using JPLs increase production?
    A: Yes. Framing crews can save several hours by simply cutting the I-joists to length and placing them in the JPLs, rather than building pony walls, nailing in hangers, or building a platform on a rim.
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    Q: Do JPLs provide proper joist bearing?
    A: Yes. The depth of the pocket exceeds the minimum bearing requirements for floor joists as required by the Wood I-joist Manufacturers Association. The Joist Pocket Liner® is 2 1/4" deep. To assure proper bearing requirements, I-joist should be cut to length leaving no more than 1/4" at each end.
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    Q: What Causes a Squeaky Floor?
    A: Floor Joists Sitting In Metal Hangers...
    There are three types of problems that can occur when using Metal Hangers to support your floor joists. In complete, or improper hanger nailing not only affects the load-carrying capacity of the hanger, but may also allow movement between the joist and the hanger. This often results in a squeak. When I-joists are not properly seated in their hangers, a gap may be created between the bottom of the joist and the seat of the hanger. This gap allows movement when a load is applied, resulting in a squeak. Finally, Improper location of the mudsill can prevent the top flange of the hanger from being fully supported. When a load is applied, the top flange of the hanger may distort and rub against the face of the concrete or beam, resulting in a squeak.

    Uneven Floor Joists...
    In addition to being very labor intensive, I-joists installed on top of a pony wall may not be perfectly level. Any time there is a difference in the elevation of floor joists, a gap will occur, allowing for movement between the subfloor and the I-joist. When a load is applied to the surface area above this gap, the movement will cause a squeak to occur as the nail rubs against the wood. In extreme situations, an uneven floor system will cause problems above the floor level with cabinets, windows and second floor framing.
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    Q: What if my question isn't answered here?
    A:

    Contact us using any of the following:
    Telephone: (208) 377-2549
    FAX: (208) 321-0626
    Toll Free: (888) 697-8080
    E-mail: JPL@joistpocketliner.com
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