In general, it is not recommended to install 1/4" drywall directly on top of 5/8" drywall on a ceiling. The combined thickness of the two layers may cause issues with the stability and structural integrity of the ceiling. Additionally, it might not provide a smooth and even surface for finishing.
If you need to add an additional layer of drywall to an existing ceiling, there are proper methods to do so:
Remove the existing drywall: If the current 5/8" drywall is damaged or in poor condition, it's best to remove it before installing a new layer.
Install furring strips: Instead of directly adding 1/4" drywall to the existing drywall, you can install furring strips first. Furring strips are thin wooden or metal strips that create a gap between the two layers of drywall. These strips will provide a solid base for the new layer of drywall.
Consider using thicker drywall: Depending on your needs, you may consider using thicker drywall instead of 1/4". Common thicknesses for drywall include 1/2" and 5/8". Thicker drywall can provide better fire resistance, soundproofing, and durability.
Check the weight capacity: Before adding an additional layer of drywall or any other material to a ceiling, it's crucial to ensure that the structure can handle the extra weight. Consult a structural engineer or a professional contractor to evaluate the ceiling's load-bearing capacity.
Secure the new layer properly: When installing the new layer of drywall, make sure to use the correct screws or nails, ensuring a secure attachment to the furring strips or ceiling joists.
Remember, whenever dealing with ceiling modifications or structural changes, it's essential to prioritize safety and follow local building codes and regulations. If you are unsure about the best approach or if the project is beyond your expertise, it is recommended to consult a professional contractor or drywall installer. They can assess the specific situation and provide appropriate guidance for your ceiling project.