How to Install Rigid Foam on Top of Roof Sheathing
Apr 3, 2015 · Put down roof felt. Put full sheets of 2” foam on top of the sheathing and felt tacked in place. I know two layers of 1” foam would be ideal but that’s more expensive per R. Finally, lay down 1x4s parallel to the ridge at 24” spacing and screw those through the foam, felt and sheathing into the rafters.
Unvented airtight flat steel roof without spray foam?
Nov 11, 2024 · This entails creating a heavily sound-attenuated room-inside-a-room. Airtight; mass with drywall; absorption with fiberglass; that type of thing. The outer shell (plywood walls; steel roof) are considered the outer “leaf” of the soundproofing shell and so shall be made airtight prior to building the interior room.
Would like to know if applying rigid foam under metal roof is ...
Apr 4, 2011 · The stone work extends up between the rafters. If I use the ridged foam this should allow me to create a space for soffit venting. I will also be using ridge vents and probably adding a Cupola with a whole house fan built in. These old growth 2×4’s with about 30 growth rings would probably blow away a new 2×6 with 5 or 6 growth rings.
Controlling Moisture With OSB Sheathing and Steel Roof / Siding
Jul 14, 2021 · Zone 5. Steel siding and steel roof. The roof has a 3/4 inch air gap from strapping over the tar paper and osb. The siding is attached directly to the tar paper and OSB. We’ve had some condensation issues, I think, especially on the north wall around outlets. I believe the mistake we made was not including exterior insulation or better air ...
Fastening Metal Roofing to Purlins - GreenBuildingAdvisor
Aug 29, 2021 · The orignal plan was to utilize shingles to limit costs, however after analizing the numbers a little further and accounting for the cost of removing the solar arrays to replace roofing 30-35 years from now it became apparent that if I could design the steel roof to limit the cost by eliminating the plywood deck it becomes a much better cost ...
Is sheathing a metal roof necessary? - GreenBuildingAdvisor
Feb 21, 2013 · Expert Member. MALCOLM TAYLOR | Feb 21, 2013 11:26am | #7. Other advantages of sheathing are that it provides backing for fasteners at roof penetrations and flashing, makes for a walkable roof for maintenance purposes, allows a thinner gauge of metal to be used and is more resilient to damage from falling debris.
Building a Foolproof Low-Slope Roof - GreenBuildingAdvisor
Apr 21, 2014 · The roof, with a 2-in-12 pitch, is framed with I-joists, strapped with 2x4s, and sheathed with 1/2-in. plywood. Above the roof sheathing, the roofers plan to install NovaSeal roofing underlayment and standing-seam metal roofing. Below the sheathing are two layers of Roxul mineral wood insulation, providing a total of R-36.
Staying Cool with a Metal Roof - GreenBuildingAdvisor
May 21, 2012 · David Martin is troubled by some of the advertising claims he’s seen about metal roofing, specifically a statement from the Metal Roofing Alliance that a “cool metal roof can save 25% in energy costs compared to a dark grey asphalt shingle.”. “I’ve searched around the Internet and found a lot of the industry’s advertising,” David ...
Insulating Low-Slope Residential Roofs - GreenBuildingAdvisor
Apr 12, 2013 · UPDATED on April 8, 2016. There are lots of ways to insulate a low-slope roof, and most of them are wrong. In older buildings, the usual method is to install fiberglass batts or cellulose on top of the leaky ceiling, with a gap of a few inches (or sometimes a few feet) between the top of the insulation and the roof sheathing.
Metal Roofing Over Purlins - GreenBuildingAdvisor
May 9, 2011 · Search and download construction details. Martin Holladay #1. Jack, A layer of #30 asphalt felt or rubberized membrane (Ice & Water Shield) is installed between the roof sheathing and the purlins. You don't need an additional layer of felt on top of the purlins (fortunately, since it would get ripped immediately). user-917907 #2.