绝缘棉絮和毯子是成捆或成卷出售的。当绝缘被切成4英尺。或8英尺。每一片都被称为一团棉絮。当绝缘以长卷形式出售时，它被恰当地称为毯状绝缘。在大多数情况下，棉絮或毛毯的宽度相当于一个框架的大小-大约15英寸。或23日。宽。玻璃纤维棉的r值从3.2到3.8每英寸不等，取决于它们的密度。由于玻璃纤维和气囊之间的比例已被优化，密度越大的棉絮的r值越高。 Examples of sloppy fiberglass batt installation, with compressed areas and voids, are all too common. For fiberglass batts to perform well, they must be installed perfectly. It’s essential that the batts be split to accommodate wiring (click photo to enlarge) and cut exactly to fit the framing bay where they are installed. Small voids can significantly impair the performance of fiberglass batts. Fiberglass batts are air-permeable—they do a poor job of resisting airflow—so it is essential that they be installed in continuous contact with an impeccable barrier to air movement. For the very best performance, fiberglass batts should be installed in a sealed cavity (for example, a stud or joist bay) with an air barrier on all six sides. For more information on fiberglass batt installation, see Installing Fiberglass Right. FOUR SIGNS OF A GOOD FIBERGLASS JOB: Continuous, snug, and full: Insulation should be installed without gaps, including at corners. Batts should be trimmed a little oversize so that they fit the cavity snugly. The entire framing cavity should be filled, without any air gaps between the insulation and the drywall. Attic insulation should be installed over wall top…