| Term | Definition |
|---|---|
| Jamb | One of the finished upright sides of a door or window frame. |
| Jamb Stud | Wood or metal stud adjacent to the door jamb. |
| Joint Compound | A plastic gypsum mixture used to cover the joints and fasteners in gypsum wallboard installations. |
| Jointing | Forming control joints in a concrete slab. |
| Joist | Small beam that supports part of the floor, ceiling or roof of a building. |
| Joist Hanger | Metal shape formed for hanging on the main beam to provide support for the end of a joist. |
| Joule | A meter-kilogram-second unit of work or energy. |
| Jute | A coarse fiber obtained from two East Indian tiliaceous plants. |