Martin Holladay Unvented Attics

Holladay pretends to be non biased so you will trust him and find his recommendations credible.

Martin holladay unvented attics.

Design insulation details for an unvented conditioned attic that will prevent moisture problems. Response to nick schuler nick the phenomenon you are describing high rh in an unvented conditioned attic after open cell spray foam was installed on the underside of the roof sheathing is common. The owens corning system is only allowed by code in zones 2b 3b with tile roofs. Martin holladay aug 27 2016 02 32pm 11.

Martin holladay may 23 2016 01 41pm 68. Martin holladay the energy nerd is a disguised pitchmen for advertisers on his website. Response to joe lstiburek comment 7 joe thanks for sharing the language of your proposed code change proposal concerning unvented attics insulated with open cell spray foam. Upon completion participants will be able to.

My question is how deep or how much r value is being proposed with that method. Unfortunately people visit his blog website to get advice and objective opinions about energy saving products. A cathedral ceiling over a great room is a common example. Martin holladay s article creating a conditioned attic suggests that because you are using closed cell spray foam providing a supply and return may not be necessary.

I ve passed the editorial reins of the green building advisor web site to the capable hands of brian pontolilo. We agree that avoiding sheathing rot is critical and that air permeable insulation such as fiberglass or cellulose cannot be used alone. The additional heat loss and gain of ducts in unconditioned vented attics increases energy use for heating and cooling 10. Recommend remedies to reduce the chance of sheathing rot in unvented attics with high moisture levels.

By martin holladay energysmartdetails f r o m g r e e n b u i l d i n g a d v i s o r. Stay away from the green building advisor website of martin holladay. In another popular holladay article the spray foam industry is exposed for usingbelow code levels of insulation. Additionally duct air leakage has been measured to commonly exceed 20 of conditioned air flow which results in a significant energy loss when ducts are in unconditioned space.

Martin s post focuses on the marketing of owens corning s propink unvented attic insulation system. In the most recent issue of fine homebuilding martin holladay wrote a piece on insulating unvented roof assemblies. But in it unfortunately all four options provided are dominated by foam. You can find all of the musings of an energy nerd blogs that i ve written over the last 10 years about 536 blogs according to my calculation at the green building advisor web site.