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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.
Issues & Performance

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.

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.

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.

GBA: Open-Cell Spray Foam & Damp Roof Sheathing
Green Building Advisor says when open-cell spray foam insulation is installed on the underside of OSB roof sheathing, the sheathing sometimes gets damp.
Procedures

Building America: Below Deck Spray Foam Insulation For Existing Roofs
Building America describes issues and considerat6ionf for planning and installing spray foam insulation below existing roofs.

Building America: Unvented Attic Insulation
Building America Solution Center describes issues and considerations for installing unvented attic insulation.

Building Science Seminars: Cathedral Ceilings & Conditioned Attics
Building Science Seminars online slide presentation describes design and insulation considerations for cathedral ceilings and conditioned attics. (PDF)

Building Science: Application Of Spray Foam Insulation Under Plywood & OSB Roof Sheathing
Building Science report Application of Spray Foam Insulation Under Plywood and OSB Roof Sheathing summarizes hygrothermal modeling of a range of rainwater leakage and field evaluations of in-service residential roofs using spray foam insulation.

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)

Building Science: Dense Pack Walls But Not Ceilings
Building Science says dense packing walls typically results in remarkable performance, but dense packing of unvented cathedral ceilings or unvented flat roofs is a problem.

Building Science: Over-Roofing With Rigid Insulation
Building Science describes how rigid insulation was installed over the top of an existing roof deck.

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)

Energy Vanguard: Remove Attic Floor Insulation In Spray Foam Attic
Energy Vanguard says attic floor should be removed when insulating the roof deck with spray foam in an existing home.

Fine Homebuilding: Air Sealing & Insulating Existing Attics
Fine Homebuilding describes a comprehensive approach to attacking insulation and moisture problems, by examining procedures, special equipment, and materials to weatherize an old house. (PDF)

Fine Homebuilding: Insulating Unvented Roof Assemblies
Fine Homebuilding says an unvented assembly can perform well, but it’s important to get the details right to avoid sheathing rot.

Fine Homebuilding: Spraying Polyurethane Foam Over Existing Roof
Fine Homebuilding describes a project that used a closed-cell, sprayed polyurethane foam over the old tar-and-gravel roof.

GBA: Creating A Conditioned Attic
Green Building Advisor offers five questions to consider before insulating a sloped roof to create a conditioned attic.

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.

GBA: How To Insulate And Air Seal An Attic Hatch
Green Building Advisor describes how to insulate and air seal an attic hatch using multiple layers of rigid foam insulation, high quality weatherstripping, and several secure latches.

GBA: How To Insulate Attic In 1910 Remodel
Green Building Advisor weighs the options for insulating the attic in a 1910 home.

GBA: How To Insulate Cathedral Ceiling With Mineral Wool
Green Building Advisor discusses how to insulate a cathedral ceiling with mineral wool, and if the rafter bays of a sloped ceiling are packed with insulation, is venting the roof necessary.

GBA: How To Retrofit Cathedral Roof With Insulation
Green Building Advisor discusses whether is it better to add insulation to a cathedral roof on the inside, or on top of the roof deck.

GBA: Insulating Flat & Low-Slope Residential Roofs
Green Building Advisor says that when insulating flat or low-slope residential roofs, unless you're careful, your roof can end up with damp sheathing.

GBA: Pondering An Attic Conversion By Spray Foaming Underside Of Roof
Green Building Advisor describes how adding spray foam to the underside of the roof sheathing will turn a vented attic into a conditioned space.

GBA: Solving Comfort Problems Caused By Attic Kneewalls
Green Building Advisor describes how insulation and air-sealing in attic kneewalls can solve many comfort problems, especially in bonus rooms.

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.

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.

JLC: Insulating Cathedral Ceilings
Journal of Light Construction describes practical solutions to insulating cathedral ceilings to prevent call backs and boost energy performance.

JLC: Insulating Unvented Attics With Spray Foam
Journal of Light Construction article explains how closed-cell polyurethane foam provides the insulation, air barrier, and vapor retarder necessary for an unvented attic assembly.

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.

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)

RDH: Thermal Benefits Of Light To Dark Roofs & Alternate Insulation Strategies
RDH Building Engineering study Conventional Roofing Assemblies: Measuring the Thermal Benefits of Light to Dark Roof Membranes and Alternate Insulation Strategies looks at both insulation and roof membrane color and utilizes calibrated energy modeling to look at the impact in different climate zones. (PDF)

Southface: Insulation & Ventilation Of Ceilings & Attics
Southface fact sheet describes benefits and procedures for insulating and ventilating attic spaces.

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.

US DOE: Air Sealing & Insulating Attic Knee Walls
Building America Solution Center describes features, benefits, procedures and considerations for air sealing and insulating attic knee walls.

US DOE: Air Sealing & Insulating Ceilings
Building America Solution Center online guide describes how to air seal and insulate a ceiling.

US DOE: Attic Eave Minimum Insulation
Building America Solution Center online guide provides information about constructing a roof with full insulation at the eaves.

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)

US DOE: Exterior Insulation Strategies For 1-1/2-Story Roof Applications In Cold Climates
US Department of Energy report Exploration Of Exterior Insulation Strategies For 1-1/2-Story Roof Applications In Cold Climates focused on identifying an exterior approach for the roof portion of 1½-story homes with the potential to provide cost-effective, long-term, scalable solutions. (PDF)

US DOE: Installing Attic Hatch Insulation
Building America Solution Center online video describes how to install attic hatch insulation.

US DOE: Installing Batt Insulation For Existing Attics
Building America Solution Center describes how to increase insulation in existing homes by installing batt insulation on the ceiling plane of the attic.

US DOE: Installing Blown Insulation For Existing Attic
Building America Solution Center describes how to insulate an attic in an existing home using blown insulation added to the attic floor.
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