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Insulation

  • A Room for All Seasons (Subscriber content)

    Enclosing an old porch adds much-needed floor space.

     
  • Installing Windows in a Deep Wall

    Double stud walls that allow for higher R-values of insulation create particular challenges for window installation.

     
  • How Small Jobs Killed My Business

    Chasing energy rebates takes the focus off solving problems and puts it on getting as much rebate with as little out of pocket as possible, resulting in small jobs and mediocre performance improvement.

     
  • Huberwood Zip System Radiant Barrier

    These roof panels can help lower attic temperatures and protect against moisture.

     
  • Adding an Insulated Envelope (Subscriber content)

    An airtight "puff jacket" achieves near Passive House levels.

     
  • Fixing Faulty Roof Framing (Subscriber content)

    A remodeler working on a master suite remodel that involves a cathedral ceiling explains how to identify and address faulty roof framing.

     
  • AP Foil-Faced Polyiso Sheathing

    This Energy Star-certified board offers an R-value of 6.5 per inch.

     
  • Cost-Saving Insulated Foundations (Subscriber content)

    Reduced excavation and forming time make ICFs a cost-effective way to build a frost-protected slab-on-grade or crawlspace.

     
  • 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 (Subscriber content)

    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.

     
 
 
 
 
JLC Field Guide to Decking