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Insulation

  • Working With Thick Layers of Exterior Foam

    JLC editor Clayton DeKorne reviews the latest Department of Energy guidelines on using rigid foam insulation.

     
  • This illustration was adapted from Chapter 4 of The NRCA Roofing Manual: Steep-slope Roof Systems2013. The bubble at lower right shows the detail in NRCA ASPH-12A, which uses a one-piece counterflashing. The bubble at upper right and the main drawing show the detail in NRCA ASPH-12, which uses a two-piece counterflashing.

    April 2015 Letters

    Step flashing; air-sealing; buried outlets; framing roofs; uneven insulation; sealed crawlspaces; window flashing; keeping flat-roof drains clear

     
  • Moisture in Fat Walls

    Researchers monitor temperature and moisture in a house for three winters to see whether 12 inches of dense-blown cellulose would work as well as the same thickness of medium-density open-cell spray foam.

     
  • How to Double R-Value Without Adding Insulation

    A lesson in building science tells us why attic insulation needs to be as flat and smoothed-out as possible.

     
  • Serious About Installing Batts

    One major insulation manufacturer has stepped up to the plate to address the challenges of installing fiberglass batts well.

     
  • Synthetic Stucco Without Failures

    To avoid a lawsuit, build a drainable assembly.

     
  • Framing a Two-Pitch I-Joist Roof

    To maintain a continuous air barrier, special attention needed to be paid to the seams that formed the joint at the wall plate where the rafters would sit.

     
  • Petri Dish House

    A cautionary tale of high indoor humidity, mold problems, and what not to do in a home if you want healthy clients.

     
  • 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.