Detailing a Metal Roof - GreenBuildingAdvisor
网页2019年3月29日 · For metal roofing Matt Risenger recommends a solid roof deck covered with impermeable peel and stick membrane. On top of this he suggests two options. One is a layer of plastic fiber mesh about 1/4" thick. This provides a path to exit for any leaks thru the metal roof, but provides little ventilation beneath the metal roofing.
Polyiso under metal roofing - GreenBuildingAdvisor
网页2016年1月26日 · My plan was to cut and cobble 3" polyiso in rafter bays. The build up would be tongue and groove, 2x2 nailers with 1.5" polyiso in between nailers for thermal break of rafters, 6mil Vapor barrier, 2 3" sheets of polyiso with very thick paper fiberglass faced, 3" vented airspace, 2x4 purlins, foil faced bubble wrap directly under metal roofing.
How to Install Rigid Foam on Top of Roof Sheathing
网页2015年4月3日 · My roofing is steel and is designed to be mounted on battens/purlins. From what I’ve learned here, seal the seams of the OSB roof sheathing with zip system tape to create an air tight barrier. Put down roof felt. Put full sheets of 2” foam on top of the sheathing and felt tacked in place.
Would like to know if applying rigid foam under metal roof is ...
网页2011年4月4日 · I will be replacing the old corrugated metal roof on my house with a new Standing Seam style metal roof. I am doing this in preparation for installing Solar panels, and I will be doing rainwater harvesting. I will be using a high reflective coating on the metal roof to reduce inductive heating of the attic and thereby the house. I would like to construct …
Is sheathing a metal roof necessary? - GreenBuildingAdvisor
网页2013年2月20日 · I'm a carpenter here in Asheville,NC zone 4/5 and trying to design a home for myself so I need to make it as inexpensive and green as possible. I'm thinking of a shed roof using flat trusses with blown cellulose to R-60 and a metal roof. Of coarse, there will be eave and "ridge" vents. So do I need to sheath the roof for metal or will just using purl-ins …
Building a Foolproof Low-Slope Roof - GreenBuildingAdvisor
网页2014年4月21日 · 2. Stack two layers of 2" Polyso foil-backed rigid sheets of foam, staggered and taped at the seams, secured to the rafters with 5 inch screws. 3. then a layer of Tyvek-roofing membrane or self adhering GRACE, or GAF against water penetration. 4. Then 2x2 or 2x4 straps screwed down, which will accommodate sheet-metal snaplock brackets, 5.
Sandwiching Roof Sheathing Between Two Impermeable Layers
网页2019年5月10日 · (b) above-sheathing ventilation channels are provided (either by installing 2x4s, 16 inches on center, perpendicular to the ridge, along with a second layer of sheathing, or by installing metal roofing on 1×4 or 2×4 purlins that are parallel to the ridge).
Fastening Metal Roofing to Purlins - GreenBuildingAdvisor
网页2021年8月29日 · I use two different manufacturers who supply a range of profiles of exposed fastener and snap-lock panels. They both provide span tables for the spacing of purlins for all their products. I don't know of any metal roofing that has to be installed on sheathing, although it's my preferred substrate, and here it is required for seismic …
Staying Cool with a Metal Roof - GreenBuildingAdvisor
网页Dana Dorsett | May 21, 2012 04:29pm | #1. Cool roofs are not for high-slope roofs in cool climates Using a high solar reflectivity/moderate deep IR emissivity approach the steady state and peak roof temperatures under summer sun can can be brought down considerably, and even in a well insulated attic the roof can be a large fraction of the cooling load.
Sheathing under metal roof - GreenBuildingAdvisor
网页2014年5月29日 · Lets pretend the roof design details are conventional and so the roof deck sheathing will be 5/8" to 3/4". Many metal roofing dealers specify minimum of 7/16" sheathing. Design depends on type of metal roof: exposed or hidden fasteners; board and batten (pan and ridge) panels; shake and shingle panels; panel or tile system; standing …