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Insulation

  • Q&A: Effectiveness of Thermal Curtains

    Do so-called "double-cell" insulating window shades perform as advertised? One salesperson claims R-3 if they are installed with an airtight edge seal.

     
  • Is Rain-Screen Siding Worth the Effort?

    It's good insurance against problems caused by wind-driven rain, but experts wonder whether the additional cost is necessary.

     
  • Moistureproof Batt Insulation

    No-itch batts are made from natural stone and slag.

     
  • High-Tech Insulation

    Nanogel material can be mixed with plaster and stucco to improve thermal efficiency.

     
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    TVA-ORNL Project Provides a Window on the Payback of Energy Upgrades

    Study finds that modest upgrades in insualtion and HVAC equipment dramatically reduce energy use in warm, humid climates.

     
  • A Cost-Effective Energy Retrofit

    With careful air-sealing and the right insulation details, a leaky older home becomes a tight and thrifty one.

     
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    Repairing a Rotting Roof

    Reducing indoor humidity was a critical first step.

     
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    Air-Sealing and Insulating a High-Performance Shell

    Take pains to seal all possible leaks, then run a blower-door test before insulating.

     
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    How Should I Finish an Existing Basement Wall?

    I am about to start a basement remodel project in a cold climate. I plan to apply a waterproofing product to the inside of the basement wall, then stick a sheet of polyethylene directly to the basement wall over the waterproof coating. Once that is in place, I'll frame a 2x4 wood-frame wall on the...

     
  • Can Fiberglass Batts Perform Well in Tightly Sealed Houses?

    I understand that fiberglass batt insulation can allow air to move through it and that this air movement degrades the insulation's R-value. Two causes I've heard about are wind-washing at the eaves and convective loops that can start in a wall cavity on really cold days and wick warmth from inside...

     
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    Building a High-Performance Shell for a House

    Advanced framing and exterior foam reduce conductive heat loss and provide good air-sealing opportunities.

     
  • Super-Insulated Slab Foundations

    Compacted drainage stone and a thick layer of foam prevent frost damage and keep the heat inside the building.

     
  • Built-Out Trim for Exterior Foam

    PVC trim provided the depth needed to accommodate an inch of insulation board.

     
  • What's New in Insulation?

    Improved materials and hybrid systems make it easier to build energy-efficient houses.

     
  • An Ice Dam Analyzed

    An engineer’s report shows that in snow country, soffit-to-ridge venting is typically the most practical way to prevent ice dams in cathedral ceiling assemblies.

     
  • Wrong-Side Housewrap

    While preparing for an extensive remodeling project, we discovered that the housewrap was installed underneath the exterior 7/16-inch plywood rather than on top. According to the scope of work, we are supposed to install 1/2-inch foam board with taped seams over the entire exterior. Will the...

     
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    Double Insulated

    Owens Corning’s EnergyComplete System has two components: a latex-based spray foam and blown-in fiberglass insulation.

     
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    Can Mold Give You Headaches?

    You bet it can: When it comes to this pervasive fungus, a little can go a long way toward wrecking a job.

     
  • Insulating a Slab With Spray Foam

    Closed-cell polyurethane provides a vapor barrier and good R-value in a single application.

     
  • Letters

    Coordination between subs; barrier-free showers vs. code; don’t ventilate crawlspace with moist outdoor air; code article misses the boat; more

     
 
 
 
JLC Field Guide to Decking