Knockdown texture is a wall finishing texture that can dramatically change the look of a room. Creating this look is easy and inexpensive.
One of the benefits of applying knockdown texture is that it is intended to have different thicknesses and levels of application. This means that there are no specific standards used to determine if the wall texture is perfect. In fact, the intention is that a knockdown texture be imperfect and random in nature.
Step 1 - The acoustical spray gun will do the bulk of the work. If you don't want to buy one, you can rent for the weekend as you work on the project. You can also rent an air compressor and hopper to help save you time and effort.
Step 2 - Mix the joint compound. This is what you will spray onto the wall for the knockdown texture. The final mixture should be thin and smooth enough to flow easily through the gun, but still stick to the wall.
Step 3 - Pour the joint compound mixture into the hopper on the spray gun. Try a few trail sprays on a piece of paper to make sure that the sprayer nozzle is at the right setting. Many any needed adjustments to the spray nozzle and air compressor.
Step 4 - Spray the compound somewhat evenly over the wall. While the thickness can vary, make sure that you do not concentrate the spray in any one area. Even if you notice smaller pieces of compound, continue to distribute those across the wall rather than concentrating them in only one area of the wall. Once you step back, rest assured that the smaller pieces won't be as noticeable.
Step 5 - Let the compound sit for about 20 minutes until it is dry, but still tacky to the touch.
Step 6 - Use the knockdown knife to cut through the pieces of joint compound on the walls. Quickly hit the pieces, knocking off the peaks of the mud without smearing them. This will create the exact texture that you are looking for with this process.
Step 7 - Let the wall texture dry for at least 24 to 48 hours.
Step 8 - Prime and then paint the walls.