cathedralized attic

QA-spotlightheader image

Pondering an Attic Conversion in New York

A homeowner wonders whether the advice he’s getting on insulating his attic will lead to trouble

Posted on Dec 25 2017 by Scott Gibson

An energy auditEnergy audit that also includes inspections and tests to assess moisture flow, combustion safety, thermal comfort, indoor air quality, and durability. on BuildingNewb's upstate New York home has prompted a recommendation that he insulate the rafter bays with dense-packed cellulose, transforming what is now a ventilated attic into conditioned spaceInsulated, air-sealed part of a building that is actively heated and/or cooled for occupant comfort. .


Tags: , , , , , ,

Image Credits:

  1. Images #1 and #2: BuildingNewb

building-scienceheader image

Three Reasons to Remove Attic Floor Insulation in a Sealed Attic

Attics insulated with spray foam have different characteristics from vented attics

Posted on Aug 10 2016 by Allison A. Bailes III, PhD
prime

I get asked a lot of questions about spray foam. Do I need an ignition barrier? Should I use open-cell or closed-cell spray foam? Will open-cell spray foam really rot my roof?

But the question I get more than any other on this topic is about whether or not the insulation on the attic floor should be removed when insulating the roof deck in an existing home. As you can tell from the title of this article, my answer is to remove it. Here are my three reasons, in increasing order of importance.


Tags: , , , , ,

Image Credits:

  1. Energy Vanguard

musingsheader image

Can Unvented Roof Assemblies Be Insulated With Fiberglass?

Owens Corning is promoting an insulation method that has long been considered risky

Posted on Aug 21 2015 by Martin Holladay
prime

Experts usually advise builders that you can’t install fiberglass insulation directly against the underside of roof sheathingMaterial, usually plywood or oriented strand board (OSB), but sometimes wooden boards, installed on the exterior of wall studs, rafters, or roof trusses; siding or roofing installed on the sheathing—sometimes over strapping to create a rainscreen. . If you want to install fiberglass between your rafters, you have two basic choices: either include a ventilation channel between the top of the fiberglass insulation and the underside of the roof sheathing, or install enough rigid foam above the roof sheathing to keep the roof sheathing above the dew point during the winter. These rules were developed to prevent damp roof sheathing.


Tags: , , , , , , ,

Image Credits:

  1. Images #1 thorugh #5: Owens Corning
  2. Image #6: U.S. Department of Energy

QA-spotlightheader image

Pondering an Attic Conversion

Adding spray foam to the underside of the roof sheathing will turn a vented attic into a conditioned space — but will it also create problems?

Posted on May 20 2013 by Scott Gibson

Rob Graff is getting a new roof, and with it an opportunity to turn his vented attic into an insulated, conditioned spaceInsulated, air-sealed part of a building that is actively heated and/or cooled for occupant comfort. .

But he’s also got some concerns.


Tags: , , , , , , , , , ,

Image Credits:

  1. Fine Homebuilding

musingsheader image

Creating a Conditioned Attic

Five questions to consider before insulating a sloped roof

Posted on Dec 31 2010 by Martin Holladay

UPDATED on August 13, 2017 with new concluding paragraphs

Millions of Americans live in states where residential HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. contractors routinely install ductwork in unconditioned attics. In many cases, these attics also contain a variety of appliances, including air handlers, furnaces, or water heaters.


Tags: , , , , , ,

Image Credits:

  1. Fine Homebuilding

Register for a free account and join the conversation


Get a free account and join the conversation!
Become a GBA PRO!

Syndicate content