Loose joint tapes are a common problem in recently constructed homes. Sometimes the cause is poor workmanship. Other times it is due to natural settling as the house adjusts to seasonal changes. Whatever the cause, you can fix it easily with some basic drywall repair supplies. These are available at most home-improvement centers. Avoid buying cheap tools---especially anything made of plastic because they lead to poor results. Ask a store representative for recommendations if you are unsure which products will work best for you.
Instructions
1. Remove all the loose joint tape. Using a 6-inch drywall knife, scrape away all loose material. If you have difficulty removing the joint tape, try soaking the area with warm water using a moist sponge. Allow the area to dry before proceeding.
2. Apply a thick coat of joint compound over the entire length of the joint. Use a 6-inch drywall knife to spread the joint compound evenly and smoothly. Do not leave any areas bare, or the joint tape may not adhere correctly.
3. Lay a piece of paper drywall tape over the joint. Make sure the tape has joint compound underneath it at all points along the length of the joint.
4. Wipe away the joint compound from underneath the tape using an 8-inch drywall knife. Start at one end, and apply pressure to the knife. Move the knife across the joint briskly and smoothly. Remove as much of the joint compound as possible. Leave the joint smooth and flat. Allow it to dry.
5. Lay an even, thick coat of joint compound over the length of the joint using a 12-inch drywall knife. The overall goal is to hide the taped joint so that it will not be visible through paint. Leave the joint as smooth as possible, and allow it to dry.
6. Sand the area using 100-grit sandpaper. Do not sand so hard that you uncover the tape. Remove all the ridges and tool marks you can.
7. Lay a thin coat of joint compound over the length of the joint. Work in small sections. Apply joint compound to an area, and wipe it off completely. Leave the joint smooth and blemish-free. Allow it to dry.
8. Sand the area using 150-grit sandpaper. Leave the area smooth and ready for paint.
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