II: Installing Fiberglass & Mineral Wool Attic & Ceiling Insulatio
Insulation Institute online guides describe installation details for attics and ceilings that will assist with proper installation for fiberglass and mineral wool batt insulation. Covers topics from hatches to ventilation baffles, and provides links to publications and videos for more information.
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Building Science: Cool Hand Luke Meets Attics, Conditioned Or Unconditioned
Building Science says when we move insulation to the underside of a roof deck the space below the insulation is now within the conditioned space. This has all kinds of implications…some good…some not so good. The bad implications are that we can accumulate moisture in the attic and attic assemblies if we don’t have a means of removing the moisture.
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Building Science: Open Cell Foam & Moisture In Attic
Building Science Corporation says it is OK to use open cell low density spray foam in conditioned attics….but the attics need to be conditioned. There has to be a moisture removal mechanism. they recommend air change.
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Energy Vanguard: Humidity in a Spray Foam Attic
Energy Vanguard onsite monitoring of an attic with spray foam insulation on the roofline shows that the humidity at the top of the attic gets much higher than both the humidity at the floor of the attic, and outdoor humidity.
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Building Science: Deep Energy Retrofit For Zero Energy House Flat Roofs
Building Science online Measure Guideline: Deep Energy Enclosure Retrofit for Zero Energy House Flat Roofs describes strategies and procedures for an exterior retrofit of a flat, wood-framed roof with brick masonry exterior walls, using exterior and interior (framing cavity) insulation. (PDF)
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Building Science: Two Options For Weatherizing Existing Attics
Building Science report Attic or Roof? An Evaluation of Two Advanced Weatherization Packages, examines two distinct strategies for insulating and air sealing the top of houses. One strategy applies best practice air sealing methods and a standard insulation method to the attic floor. The other strategy creates an unvented roof assembly using materials and methods typically available to weatherization contractors. (PDF)
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GBA: How To Insulate A Flat Roof
Green Building Advisor describes how an architect looked for the best way to insulate a flat roof on a contemporary house, at a price his clients can accept.
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II: High Performance Vented Attics With Buried Ducts
Insulation Institute says the 2018 International Energy Conservation Code laid out a prescriptive path for the use of buried ducts with fibrous insulation in vented attics, for all climate zones. This new path was approved because it will allow builders to get much of the energy efficiency benefits of an unvented attic with closed cell spray foam by instead doing a traditional vented attic with the ducts buried in fibrous insulation.
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JLC: Insualting Attic Knee Wall
Journal of Light Construction Q & A on insulating a knee wall says it's better to insulate along the rafters and down the outside wall than to try to insulate the knee wall and floor.
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JLC: Insulating Cathedral Ceilings
Journal of Light Construction describes practical solutions to insulating cathedral ceilings to prevent call backs and boost energy performance.
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NRCan: Air Sealing & Insulating Roofs & Attics
Natural Resources Canada online guide Keeping The Heat In describes how to air seal and insulate easily accessible attics, houses with half storeys, cramped attics, cathedral ceilings and flat roofs, as well as dealing with ice dams, and renovations and repair.
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RDH: Measuring Benefits Of Insulation Strategy & Roofing Colours
RDH Building Engineering report Monitored Field Performance of Conventional Roofing Assemblies: Measuring the Benefits of Insulation Strategy, summarizes a field-monitoring study measuring impacts and benefits of membrane color (white, gray, and black) and the insulation strategy used within these roof assemblies. (PDF)
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US DOE: Above Deck Rigid Foam Insulation For Existing Roofs
Building America Solution Center describes how to install insulating sheathing above the roof deck on existing homes. This retrofit assembly is appropriate for homes with conditioned attics or where the retrofit is intended to create a conditioned attic.
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US DOE: Exterior Insulation Strategies For 1-1/2-Story Roof
US Department of Energy report Project Overcoat, An Exploration of Exterior Insulation Strategies For 1-1/2-Story Roof explored solutions for older homes at risk for heat loss and ice dam formation. This three-part exploration was focused on identifying an exterior approach for the roof portion of 1-1/2-story homes with the potential to provide cost-effective, long-term, scalable solutions. (PDF)
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