Why Are My Drywall Seams Showing and How to Fix Them

Many homeowners encounter the frustrating issue of visible drywall seams, which can detract from the appearance of their room's finish. Understanding the causes and proper techniques for repairing these issues can help you achieve a professional and aesthetically pleasing result.

Causes of Visible Drywall Seams

Drywall seams can become noticeable due to several factors, including improper taping, insufficient joint compound application, drying issues, sanding problems, lighting, and environmental conditions such as temperature and humidity.

Improper Taping

If the joint tape was not applied correctly or the mudding process was rushed, the seams may become visible. Proper taping involves ensuring that the tape is well embedded in the joint compound by applying it and spreading the compound to fully cover the tape. This process should be done carefully to avoid air bubbles and ensure a smooth, even surface.

Insufficient Joint Compound

Lack of enough joint compound over the seams can cause the texture to differ from the surrounding drywall, making the seams more noticeable. To address this, apply a sufficient amount of compound to cover the tape and seams, ensuring that the surface is even and smooth.

Drying Issues

If the joint compound dries too quickly due to heat or airflow, it may crack or shrink, exposing the seams. Properly controlled drying time is crucial to avoid such issues. Ensure the compound dries slowly and evenly to minimize cracking and shrinkage.

Sanding Problems

Over-sanding or under-sanding the seams can lead to an uneven surface, making the seams more apparent. It is essential to sand the area gently to remove imperfections while maintaining a smooth finish. Over-sanding can remove too much compound, while under-sanding can leave the seams visible.

Lighting and Environmental Conditions

The type and angle of lighting in the room can accentuate the seams. Harsh lighting or shadows can make imperfections more visible. Additionally, extreme changes in temperature or humidity can affect the integrity of the drywall and joint compound, causing visible seams over time. Maintaining a stable environment and using appropriate lighting can help reduce the prominence of seams.

Fixing Visible Drywall Seams

To fix visible seams, you may need to apply additional joint compound, sand the area smoothly, and repaint for a uniform finish. The steps involved include:

Applying additional joint compound to the seams. Sanding the area to remove the compound and achieve a smooth finish. Priming and painting the area to further blend the seams.

It is recommended to hire a professional if you are unsure about the extent of the issue or if the seams are part of a complex project. Professionals have the experience and tools to ensure proper installation and finishing techniques, which are crucial for a good final result.

The Process of Proper Taping and Compound Application

The most likely cause of visible drywall seams is improper installation or taping. To hide the seams, create "mounds" of compound with each layer being broader than the last for a precise coating.

Step-by-Step Guide

Ensure there is 1/8” clearance to accept mud between joints.

Apply a thin, consistent layer of mud to fill the joint and cover each edge with at least 2–3” of mud.

Press the tape into the mud, making sure the side with the ridge is facing the joint. Spread the mud from the center outwards to the sides, similar to applying a sticker or a phone screen protector.

Once the mud has dried, use a 6” knife to cover the joint completely with a thin layer of mud (1/16” to 1/8”). Feather the edges to the drywall to ensure a smooth finish.

Apply a second coat if needed, feathering the edges to hide noticeable humps.

After the mud has dried, inspect it by shining a light parallel to the wall. This will help identify any raised spots.

Apply primer in two or three coats to seal the seams and allow the paint to adhere properly.

Walls that are painted prior may not accept texture as well as new drywall. It is best to texture and prime again to ensure a seamless finish.

By following these detailed steps and considering the environmental factors and professional help when necessary, you can effectively address and resolve the issue of visible drywall seams, achieving a professional and aesthetically pleasing result in your home renovation project.