太阳屏障领空
I am adding a solar barrier between layers of an alluminum roof. The existing roof is over a covered florida room. The roof system has a lower layer that is also the ceiling. The lower layer is connected to the top layer by 3 inch alumuinum I beams. The roof is insulated with porous styromfoam which is noisy when it rains and does not stop any heat penetration at all. Impossible to aircondition! I purchased a solar barrier to place between the layers of room. When installed draped over the I beams after removal of the styrofoam, it gives the 2 inch airspace that is required for the new solar barrier to reach it’s dsigned isulation rating of R16. The new product has the reflective material sanwiched over a thin layer of foam insualtion. The total product thickness is 5/16 inch thick.
My question is if I add back the old styrofoam over the draped solar barrier, will it suffice as the 2 inch airspace since it is porous? Or should I just throw it away?
Thank you,
Phil Ragan
GBA Detail Library
由气候和房屋部分组织的一千个建筑细节的集合
答复
I'm highly sceptical as to this "solar barrier" providing R16 or anything close. Could you provide some more information about it?
菲尔，
你被打了。您正在描述一个辐射障碍；充其量，它可能会使您的空间具有R-2或R-3的R值。但是，铝制屋顶托梁的热桥进行了太多的热量，以至于组件的R值要少得多。
You need a continuous layer of rigid foam or mineral wool under the rafters, not a radiant barrier, if you want to reduce heat flow through your roof assembly.
For more information, seeRadiant Barriers: A Solution in Search of a Problem.
辐射屏障在IBEAM上滚动，然后掉落以覆盖天花板的顶部。在I光束上将有一层绝缘的太阳屏障，然后将顶层拧回到I光束上。
I just know I used radiant barrier in a home I built in North Florida and it worked wonders! It was draped over the trusses before the plywood was nalled down. Even before the ceiling insulation was installed it was super cool below. The plumbers and carpentars couldn't believe the difference. This was in July.
我会尝试回复。从屋顶上卸下螺钉，然后安装屏障并将面板拧回打开大约一天！
我使用的产品称为Prodex总数。您可以在网络上找到它。
谢谢，
Phil
毫无疑问，它将保持阁楼凉爽，但您不生活在阁楼中，因此这是可疑的价值。如果您的阁楼井密封并隔热，那么它的热量也没关系。通常，这笔钱通常会在热度上花费，将阁楼与居住空间分开，而不是试图改善阁楼本身的条件。阅读Martin发布的文章 - 详细介绍了所有这些内容。
I appreciate your answer. I am working on my florida room that only has three inches between roof and ceiling so I am limited to options..
Thank you,
Phil Ragan
菲尔，
我不知道什么是“佛罗里达房间”，但是我用谷歌搜索了它，看起来通常称为封闭式门廊或三季房间。那正确吗？
A radiant barrier works. It transforms an R-1 air space into an R-2 or R-3 air space, and this transformation can lower the temperature of your attic or your porch. If you want to install the radiant barrier, go ahead. Just remember that you don't have an R-16 ceiling.
真正的绝缘材料会更好，尤其是当您使用空调冷却房间时。真正的绝缘材料是诸如刚性泡沫，纤维素，矿物质羊毛或玻璃纤维之类的材料。佛罗里达州温暖部分的天花板的最低代码要求为R-30，约为4或5英寸的刚性泡沫，或至少9英寸的蓬松绝缘材料。
Thank you Martin. Yes sir, when I take the remove the aluminum roofing panels, there is only three inches to play with. The I beams are manufactured upward from the ceiling panels so I don't have many options. I am hoping rolling the radiant barrier across the beams and draping it between the beams will give me some relief. The beams will be covered with the 5/16 inch material and then I plan on using longer screws to screw the roofing panels back in position using the same holes from the previous screws. The screws have neoprene washers to better seal he panels. I am definitely researching the mineral wool material having not heard of it before.
最后一个问题是，我应该在I光束之间的辐射屏障上安装泡沫聚苯乙烯面板还是抛弃它？该系统具有2英寸厚的聚苯乙烯泡沫塑料面板，它们在横梁之间铺设了纵向。.我添加了照片，是的，我需要压力清洗面板。橡树已经在佛罗里达中西部盛开。您可以在第二张图片中看到层之间的泡沫。您是正确的，因为它是一个封闭的门廊。窗户是热橙。
Thank you for your advise. Phil
菲尔，
如果您取下屋顶面板，则有机会在金属a子上方安装连续的刚性绝缘层。也许您可以安装OSB护套，然后是连续的2英寸厚的刚性泡沫绝缘材料（不是细条）。然后，您可以用更长的螺钉重新安装屋顶面板。
Thank you. Phil
Phil
Read up on thermal bridging. With metal it is much worse than wood. What you have is like a car radiator. When the sun beats down on the roof it travels through the metal and is dissipated into the room. I think that is the reason the existing insulation is not working.
You need to keep the heat from the reaching the metal. A cool roof approach over a layer of rigid insulation would be the may to go.