我在哈德敦德克萨斯州，位于休斯顿地区气候区的东南侧2.我开始了一个DIY Attic绝缘工程。阁楼在每侧都有很大的山墙通风口，没有拱门通风口。和从未使用过的动力阁楼风扇。有时我可以在那里感到笑容。阁楼有2×4天花板托梁，在生活空间侧有带有吊顶瓷砖的Shiplap板。没有垫片。当你想在那里走路时，这很好。在阁楼中的2×4顶部托梁的两者之间和顶部是黄色箔面积2×4尺寸的玻璃纤维绝缘，箔面朝朝向屋顶。我的计划是将已经存在的东西留下，并在顶部添加了垂直的R-30玻璃纤维的未乘客卷。这应该让我至少达到R-40或更多。 My question is can I just leave the old insulation with the foil face up and cover it up with unfaced R-30 fiberglass? In a lot of spots it’s dusty and the foil is crumbly. Also should I even worry about having a “kraft face” vapor barrier on the living space side? Do I even need that in the Houston area climate zone 2? Eventually we plan to remove the ceiling tiles because they’re ugly and attach sheetrock to the shiplap. Based on what I’ve read, painted sheetrock acts as kind of a vapor barrier.