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Tyvek "DrainWrap vs. Tyvek "HomeWrap" with James Hardie Lap Siding

Equanimity
5 years ago
last modified: 5 years ago

We're building a new home in New Jersey. We're going to use James Hardie HardiePlank Lap Siding ("Smooth") for the exterior siding.

I've heard from a general contractor friend that it's best to use Tyvek "DrainWrap" (which has vertical ribs) when using fiber cement siding. The logic in doing so is to promote draining (because the ordinary "HomeWrap" product is a completely flat surface).

From the DrainWrap website:

http://www.dupont.com/products-and-services/construction-materials/building-envelope-systems/brands/water-barrier-systems/products/tyvek-drainwrap-moisture-barrier.html

"Tyvek® DrainWrap™ helps provide enhanced drainage behind claddings such as primed wood (all six sides), fiber cement siding, and foam board applied over flat substrates. Vertical grooves on the surface of Tyvek® DrainWrap™ make it a superior moisture barrier, engineered to channel bulk water away from wall systems and drain safely to the outside."

Has anyone used this "DrainWrap" product with James Hardie HardiePlank Lap Siding? If yes, what are your thoughts?

Thanks!

Comments (7)

  • JDS
    5 years ago

    If you are in a high rainfall area instead of Tyvek DrainWrap I recommend Home Slicker Plus Typar by Benjamin Obdyke.

  • Equanimity
    Original Author
    5 years ago

    We are in an "average" rainfall area (in New Jersey, but not near the coast). Is there only benefit to using these products in areas that receive a lot of rainfall?

  • PRO
    Springtime Builders
    5 years ago
    last modified: 5 years ago

    Ditto Worthy and JDS, Best would be 3/8-3/4" strapping with coravent or crafted insect screen at top and bottom. Any flat non-woven housewrap like 15# felt, standard tyvek or typar would be fine in that application if not using a WRB integrated structural sheathing like Huber Zip.

    If installers aren't comfortable with a true rainscreen strapping, then homeslicker would be next best followed by drainable housewraps. We've used 3d mesh like homeslicker behind shingles but not lap siding as I've read it can become wavy.

    Good job researching best siding practices. I don't think any siding should be installed flat against structural sheathing with standard housewraps in any climates except very dry. Non-insulated vinyl being an exception as it creates it's own rainscreen.

    Check out Matt Risinger's video to see a performance experiment between regular tyvek and stuccowrap. Speaking of which, I hope you are including exterior foam or similar performing wall details.

  • Equanimity
    Original Author
    5 years ago

    Does anyone have any experience with Benjamin Obydkye HydroGap® Drainable Housewrap?


    http://www.benjaminobdyke.com/products/hydrogap-drainable-housewrap/


    http://www.hydrogap.com/

  • Equanimity
    Original Author
    5 years ago

    Also, does anyone have any experience with the TamlynWrap® Drainable Wrap?


    http://www.tamlyn.com/dev/product.php?g=Water%20Management&c=Drainable%20Housewrap&i=0

  • HU-438387745
    2 years ago

    I would avoid Drainable housewraps because it offers a small 1mm drainage plane and offers NO ventilation. The airflow is really what you are after so the 1mm capillary break isn’t sufficient. Home Slicker is a great product but the problem is they don’t manufacturer their own products and pricing gets higher with more layers to that onion. I would use MortairVent by Advanved Building Products. It is made in Maine, great warranty and it gives you the 6mm space needed for drainage and ventilation. You can order through Home Depot I believe or any ABC Supply