调节机构的新泽西州家庭拥有一款绝缘的通风阁楼，他想更新。大约有一半的阁楼是在托梁和干墙的天花板上，但在主卧室里，拱形天花板包括由重木托梁支撑的舌头和槽板组成。

Before Modulerics adds more insulation to the area over the vaulted ceiling, he first needs to seal the tongue-and-groove ceiling against air leaks.

“So in the attic I’ve got a this whole area flat, no joists to work around,” he writes inthis recent Q&A post. “It currently has R-11 batts on top of it. I want to blow insulation in the whole attic. What’s the best way to air-seal the-tongue-and groove section?”

Among the options he sees is removing the insulation that’s already there and stapling or cap-nailing down a layer of Tyvek housewrap and taping the seams.

“It’s a low-slope roof, if that means anything,” Modulerics adds. “If I remove the batts, I should not reinstall them so I don’t trap moisture between the batting and the air barrier I put down, correct? Should I build dams and blow in cellulose?”

Or, Modulerics continues, he might simply add the housewrap over the batts already in place, creating what he calls “one big pillow,” and salvage whatever R-value the batts are providing.

That’s his situation. What should he do? That’s the question for this Q&A Spotlight.

Skip the housewrap

Zephyr7表明了两个替代品。一个是去除BATT绝缘，然后在暴露的舌沟板上喷涂聚氨酯泡沫的薄层。另一种方法是使用在罐头喷雾泡沫的周边密封的刚性泡沫绝缘层，一种称为“切割和鹅卵石”的方法。

Spray foam is expensive, and…