Staying Cool with a Metal Roof - GreenBuildingAdvisor
2012年5月21日 · I can say from practical experience that nothing beats a white metal roof reflectivity (> .80 - .90) and high emissivity (> .80 - .90). Galvanized and Galvalume metal roofs are hot roofs. They have medium relfectivity and poor emissivity ( .15). Painting a bare metal roof with white house paint dramatically improves preformance.
Spraying Polyurethane Foam Over an Existing Roof
2013年2月4日 · When Taya and Stephen Shoup's old tar-and-gravel roof began leaking, the couple hoped to find a replacement roofing that would be energy-conserving, leakproof, cost-competitive, and reasonably green. As the house's roof sheathing doubled as a finished ceiling, the old insulation was scant. They broiled in the summer and hemorrhaged money during the heating season.
How to Choose a Metal Roof - GreenBuildingAdvisor
2019年9月13日 · Could the asphalt rot before the metal roof is due for replacement decades from now? 2. If I opt for striated panels to minimize oil-canning issues, could this create problems affixing the peel-and-stick thin-film solar panels? Anyone has experience affixing peel-and-stick thin-film solar panels to a striated standing-seam metal roof?
Would like to know if applying rigid foam under metal roof is ...
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 …
Replacing a Quonset Hut Roof - GreenBuildingAdvisor
2022年1月9日 · Yes, the metal roof is not the WRB anymore and you have to add that which is itself a kind of waste but maybe fixing the existing roof is worse than separating the job and adding more layers. - Keep the metal as structure, use some elastomeric spray coating from inside or outside to make it the airtight layer (or a WRB membrane wrapped around ...
Metal roof on purlins and heating - GreenBuildingAdvisor
2017年11月15日 · Hi I had a metal roof guy tell me my roof won't pass code and will have water issues. (I don't believe him, so though I would ask the experts) The plans passed and I got a building permit. Its a detached garage ( so not that worried anyway) the roof is a engineered truss 6/12 48" O.C. with 2x4 purlins laid flat 24" O.C. The plan was to have metal roof screwed to purlins, sofffit to ridge ...
The Best Way to Keep Your Attic Cooler is to Change Your …
2015年8月26日 · In climate zones 3-8 lower peak & average roof deck temps will also lead to higher average moisture content in the roof decking, sometimes to the level of rot potential. That problem that doesn't occur with radiant barriers stapled to the underside of the rafters, while achieving comparable energy use goals.
Metal over exterior rigid insulation? - GreenBuildingAdvisor
2018年12月17日 · We intended to use a cement board with a parge coating, but we couldn't find long enough flat-head concrete screws to sufficiently penetrate 5" of Rockwool and the concrete of the foundation. Instead, we reluctantly went with metal flashing, essentially just continuing what would've ordinarily been Z-flashing from the Zip sheathing down over ...
Preventing Roof Algae - GreenBuildingAdvisor
2023年4月28日 · This roof has three rectangular vent penetrations. The one on the left has painted steel flashing which has no effect on roof algae. The two penetrations on the right are flashed with unpainted galvanized steel; metal ions leached from the flashing's zinc coating prevent algae growth on the asphalt shingles below. [Photo courtesy of www ...
Utilize an air gap under a metal roof above a conditioned …
2020年1月5日 · 1) Metal roofing mounted directly on the deck without Above Sheathing Ventillation (ASV) results in about the same heat flows into the attic as asphalt shingles. 2) The heat flow into the attic can be reduced by ~45% with ASV 3) The air gap can compensate for a good bit of coating aging