房主如何找到承包商在屋顶护套顶部安装刚性泡沫？
To everyone, but especially anyone in the Chicago area:
我们住在伊利诺伊州惠顿,一个别致的西郊ago. Our home, built in 1959, needs a new roof, new gutters, and more insulation. We may consider metal shingles if there is a good option that does not cost too much. We would like to convert one or both of the attics of our split level from conventional, vented attics to un-vented attics to be used for storage. As described in Martin Holladay’s article, “How to Install Rigid Foam On Top of Roof Sheathing” (option 1 of the article), we would like to install R49 of rigid foam (about 12.5 or 14 inches of EPS, 10 inches of XPS, or about 9 inches of polyiso) above our roof sheathing. We’ve been told that this would take a lot of work and cause a large expense in fascia, etc. but we have not found any contractor willing to give us a quote. We would also consider option 2 of the article, which is to install part of the insulation as rigid foam above the roof sheathing, and the rest of the insulation underneath the roof sheathing. The height of each attic is very minimal (~45″ max in one attic and ~35″ max in the other), so we would like to aim for an option that preserves the meager attic height that we have. Access to each attic is by ladder at the present. If there is an affordable way to build a fixed stair to make the attic(s) more accessible, we would like to find it. We have been hoping to put off this project for a few years, but we keep having leaking in the roof area shown in the attached picture, where the roof of an addition we put on 5 years ago (the closest part of the picture) joins the old part of the house (the siding on the right in the picture.) If we, by hard work or time spent, can decrease the cost to accomplish all these goals, we would like to try, but we are only somewhat handy. If you know of anyone who would be interested in this project, please help me contact them. Thanks!
丽贝卡
GBA细节库
由气候和房屋部分组织的一千个建筑细节的集合
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Passive House Institute US is based out of Chicago. Maybe reach out to them for contractor recommendations. They have a list of PHIUS certified builders, and there are a number in Illinois:http://www.phius.org/find-phius-certified-professionals/find-a-phius-certified-builder
A contractor comfortable building a passive house ought to be comfortable putting a big pile of foam on your roof and dealing with all of the issues it presents.
顺便说一句：在沥青屋顶板XP的生命周期中，将下降到其额定R值的90％，并且在建筑物的寿命上，它将下降到大约相似密度的EPS。
在您的位置和全泡沫堆栈中，为性能培养为polyiso至R5.5/英寸。
II型EPS（每立方英尺密度为15磅 - 足够坚硬，可以进行“可步行”）仅需12英寸即可达到R50+。即使是低密度I型（在这里不要使用类型I！）也会以13英寸的速度击败R50”。。我不确定您想到的14英寸。
If the goal is to hit the R49 code-minimum, note that is for insulation thermally bridged by rafters or joists. When the insulation is continuous it doesn't need to be that thick, and you can meet code on a U-factor basis. According to TABLE N1102.1.4 in the IRC it only needs to be U0.026, which would be a "whole assembly R" of about R38.5, and you can include the R-value of the roof decking, ceiling gypsum, the R-value of the shingles & felt, as well as the interior & exterior air films. All that other stuff adds up to about R2, so the foam R only needs to be about R36.5. That means you can get there with 9" of EPS (instead of 12") or 7" of polyiso.
But there's more...
在屋顶甲板上方的R20的情况下，您可以在屋顶甲板下安装多达R30的纤维隔热材料，而水分风险很小，如果after绕的afters the脚这么深，可能会便宜。假设它们是2x6的，请继续使用湿洒的纤维素（〜R20）或精心雕刻的R23岩石羊毛或R21玻璃纤维填充腔，但仍然没有在after绕after边缘以下的任何净空。带有座椅的屋顶和24英寸O.C. after间距，您正在查看大约10％的框架分数，在这种情况下，泡沫，afters，屋顶甲板和带状板，空中膜等均加大约r18.5，在这种情况下您只需要（R38.5- R18.5 =）R20在外部以U因子制作代码。
That means with 5.5" of fluff between the rafters you can fully get there with only 5" of continuous EPS, or 4" of continuous polyiso. That's relatively easy to install and build new facia for WAY easier than the 9-12" you were looking at. With 4" of polyiso held down by a half inch OSB nailer deck through screwed to the structural roof you are at the depth of a standard milled 1 x 6. But you can also get 6" commercial drip edge to cover the edge rather than a prettified facia board. It comes in galvanized, powder coat white, deep brown, dark gray and a few other colors. You can probably find something that won't look too outlandish. It won't be at the home center, but a roofing supply place catering to commercial rather than residential would have it (or order it.)
另请注意：任何类型的最绿色泡沫都是重新制定/重用的泡沫，其成本少于Virgin Stock Goods运行的一半。屋顶EPS和Polyiso在商业建筑拆除和重新屋顶期间经常被清除，如果当地的Craigslist有任何迹象：
https://chicago.craigslist.org/search/sss?query=rigid+insulation
Thank you, Brendan! I plan to contact a PHIUS certified builder tonight.
Thank you, Dana! This is the third question of mine that you have answered, and I plan to give the builder all the info you have given me, to guide them in how to get this project done right.
对于达纳·多塞特（Dana Dorsett）以及安装6英寸商业滴灌边缘以覆盖刚性泡沫边缘的任何人：
I have a question about 6" commercial drip edge. The man I talked with at a roofing supply company near me was very helpful. He was concerned that, since the commercial drip edge has an angle of 90 degrees and ours is not a flat roof, we would need to bend it on site to match our roof pitch (approx. a 3" per 12" or 4" per 12" pitch.) He thought the bending process would be pretty difficult. It does seem that we would have to bend it to an angle much larger than 90 degrees. He thought maybe we should ask someone at a sheet metal shop to bend some of their metal to the desired angle for us. Any thoughts?
Thanks!
丽贝卡
丽贝卡，
The man at the roofing supply company was right. Any sheet metal shop should be able to help you.
Thanks, Martin! I will try calling sheet metal shops.
在您打扰之前，许多屋顶工还会壁板并拥有钣金休息。他们可以将其弯曲在现场。
谢谢，丹！我在找到合适的金属店还没有太大的成功。屋顶供应的另一个人建议我使用卷轴1“ x 6”的前弯曲（无唇，仅是L）019铝。他有14种颜色可供选择，价格为$ 13.80/12英尺，可能在我们的预算之内。如果我们的屋顶音高仅为3“每12”，那么即使我们根本不弯曲，装饰的脸也只有14度的垂直度。
丽贝卡，
根据闪烁的长度，您可以自己添加额外的角度。橙色大盒子商店每天以60美元的价格在这里租用铝制制动器。它们很容易使用。
My wife and I cut, slit, and bent about 200' of coil stock for our house in about a day.
Thanks, Mike! My husband and I may try to do the same.
丽贝卡，
在制作或委托其他人进行闪烁之前，您应该用新的绝缘材料绘制屋顶的秤部分，以了解闪烁的方式如何与屋顶，筋膜和沟槽集成在一起。
The purpose of the flashing is not only to protect the exposed ends of the insulation, but to make sure the roof drains into either your gutters or off onto the surrounding landscaping. The shape, dimensions, position of hems and fastenings all need to be thought out before you can meaningfully ask anyone to provide it.
祝您项目好运。
Thanks, Malcolm! I think drawing a scale diagram is an extremely good idea that I hadn't thought of. We have been looking at diagrams on GBA website, but I think most of the ones we've been looking at have been for new construction. I talked today with the man who may do the project for us, and he is helping me to understand that it may be a lot more difficult to succeed than I had at first thought. Thank you, everyone, very much for your advice. We sure do need it.