Is attic venting necessary in St. Louis, Missouri?
房子约为。15岁和额外的绝缘层。绝缘承包商使用Owens Corning R-13面对贝加的薄塔预示和吹入的绝缘体。
我发给你的图片代表着所有者的房子。开放式阁楼区域有一个山墙通风口和膝盖墙生活空间区域的山脊通风口。还有距离房子外观的拱道发泄。在房屋的膝盖墙段中，绝缘承包商使用了您的产品并在屋顶桁架之间安装，并将其紧紧地靠在屋顶上，没有挡板。它们还将膝盖墙阁楼区域与绝缘材料隔离。
My concern is that since there is no ventilation in the knee wall section of the attic that we have a potential moisture/mold problem. To recap the situation, the knee wall is insulated with R-13 faced batt insulation (existing), in between the floor joists is insulated with loose blown insulation(added additional), and they installed new R-13 faced batt insulation in between the roof trusses, tight against the roof sheating (NEW).
The attic is also unconditioned. I have talked to a Licensed Architect and respected insulation contractors and they all said we have a potential problem and money was wasted on the insulation added in between the roof trusses.
Can you please comment on this situation? The Insulation Contractor said he does this type of insulation practice all the time.
我无法打印图片，可以转到列出的能源之星站点，参见1.2为图片参考找到空气泄漏。
Thank you for your time,
杰瑞。
http://www.energystar.gov/ia/partners/publications/pubdocs/DIY_Guide_May_2008.pdf
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Replies
Is attic venting necessary? There are two answers to the question.
The correct answer is no. There are hundreds of square miles of roofs out there with no venting and they have no more than the usual problems, most of which are associated with leakage. It’s possible to screw up a roof that’s not vented, but any tradesperson worth their salt can deliver an unvented roof system that will work just fine. Most codes have been changed to permit these roofs.
The old official answer is yes, ya gotta vent The argument goes something like this: if you don’t vent you’ll get moisture and if you get moisture you’ll get mold and if you get mold you might just get that black toxic mold that causes babies in their sleep to strangle on their own blood.
You can tell a lot about a person depending on their attitude toward venting. It takes a little of the contrarian, of the outlaw, to say, sure, let’s go with unvented. And builders usually have that streak in their blood. I’ve never heard of an outlaw architect.
杰瑞，
There are several references in your question that are unclear -- especially the reference to "your product" (my product? GBA's product? what is it?).
However, it seems that you have two questions:
Question 1. If I have insulation on the attic floor, does it make any sense to also put insulation between the rafters?
回答1. No.
Question 2. If I want to install an insulated unvented roof assembly, can I install fiberglass batts directly against the roof sheathing?
回答2: No.
For more information on unvented roofs, you may want to study code requirements for conditioned attics (see section R806.4 of the 2006 IRC). You may also be interested in the information in one of my blogs,Creating a Conditioned Attic.
Martin and Bill,
Thank you for the responses.
当我引用“您的产品”时，我的意思是欧文斯康宁R-13面对绝缘。
Thanks again.