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Insulation

  • Studying Moisture in Fat Walls (Subscriber content)

    Comparing the performance of a cellulose-insulated double wall against the same wall insulated with two different thicknesses of low-density open-cell spray foam.

     
  • A Drywaller’s Approach to Air Sealing Homes (Subscriber content)

    Air leaks through the building shell can have a significant effect on a home’s durability, energy use, and indoor air quality. Myron Ferguson explains how drywall can be an important part of the air barrier of an enclosure.

     
  • Working With Flexible Flashing (Subscriber content)

    Some contractors still don’t understand how to get the most out of these products. Here are some tips for installations that stand firm for the long haul.

     
  • JLC April Letters

    Joists in an old floor, repairing a concrete slab in an old floor, and more.

     
  • Insulating Outside the Foundation

    Best practices for insulating a foundation.

     
  • Working With Roxul Insulation (Subscriber content)

    Choosing insulation for a high-performance home in Northern Vermont requires thought and care. The right choice can make a huge difference in both comfort and cost efficiency.

     
  • When it comes to improving the energy efficiency of a building, lots of attention is paid to insulation R-values, thermal bridges, and air sealing. But dont forget the windows, which account for the biggest energy loss in a high-R wall.

    To Improve the Energy Performance of Walls, Look at Total R-Value

    Today’s builders are learning to mitigate thermal bridging by using alternative framing techniques, continuous exterior rigid foam products, or both.

     
  • Owens Corning Propink EcoTouch R-20 Insulation

    New energy codes are calling for higher R-values in the walls

     
  • DuPont ThermaWrap R5.0

    Polyester-lined Tyvek provides R-5 insulation

     
  • Insulating Cathedral Ceilings (Subscriber content)

    JLC executive editor Clayton DeKorne explores some practical solutions to prevent call backs and boost energy performance.

     
  • At wide spots in the trench, the foam is poured to a consistent thickness against a sheet of OSB.

    Retrofit Exterior Foundation Insulation (Subscriber content)

    Is there a minimally invasive, cost-competitive, easily deployable method of upgrading soil-side foundation insulation in existing buildings? Read on.

     
  • Encapsulating ducts with at least 1 1/2 inches of closed-cell spray foam substantially improves HVAC performance in all U.S. climate zones. Burying the encapsulated ducts in loose-fill attic insulation improves performance even more.

    Buried and Encapsulated Ducts (Subscriber content)

    Encapsulating ducts with at least 1 1/2 inches of closed-cell spray foam substantially improves HVAC performance in all U.S. climate zones. Burying the encapsulated ducts in loose-fill attic insulation improves performance even more.

     
  • Building Above-Code Walls - Belfast, Maine, Cohousing Units (Subscriber content)

    Four design/build teams solve the puzzle of high-performance wall construction—in four different ways.

     
  • Building Above-Code Walls - Maine Single-Family Home (Subscriber content)

    The wall system shown here is an improved version of the system I used for the house I built in Knox, Maine, in 2011.

     
  • Building Above-Code Walls - "Avalon" a Connecticut Farmhouse (Subscriber content)

    Our wall example is part of a zero-energy single-family house built for the tenant farmer of an organic farm in rural Connecticut.

     
  • Building Above-Code Walls - Norwich, Vermont Single-Family Home (Subscriber content)

    Our challenge was to realize the owners distinctive artistic vision for their home, along with their very ambitious energy-efficiency goals, while also working within the hard limits of the budget.

     
  • Building Above-Code Walls (Subscriber content)

    Four design/build teams solve the puzzle of high-performance wall construction—in four different ways.

     
  • Building Better Eaves

    Roof overhangs can be finished in a number of materials and constructed in a wide variety of different ways. Here's what you need to know to construct eaves that will survive the test of time.

     
  • Thermal Imaging With a Blower Door (Subscriber content)

    Though it's impossible to seal every hole in an existing building to prevent air leaks, here's a procedure you can use to identify the worst leaks in order to tighten the home as cost-effectively as possible.

     
  • Rigid Rock Wool

    Designed for use as exterior continuous insulation in rainscreen wall systems, Comfortboard CIS repels water but is breathable enough to allow outward wall drying.