Drywall comes in large sheets, typically 4 x 8 feet (longer sizes in new construction) similar to plywood. That means the seams where two pieces of drywall meet, or around small drywall repairs, have to be hidden. This is done with a thin layer of joint compound, that is spread over the entire drywall area.
Flat walls require multiple coats of join compound, to make the seams invisible. So builders have found creative ways to reduce the number of coats of joint compound, and thereby lower their construction costs.
Applying Knockdown Drywall Texture
Please don't assume this is a quick and easy job, it's not and you can see how involved it is at DrywallSchool.com. Knockdown drywall texture follows most of the standard drywall steps:
- Collect all the tools you need to apply the knockdown wall (and ceiling) texture.
- Sand the drywall, including joints where the seams have been taped.
- Mix the mud you're using for the knockdown texture.
- Shoot the mud onto the walls (ceiling first) with a hopper gun.
- Wipe down what are called (mud) goobers, to create the uneven texture called knockdown.
And according to the experts at Drywall School, you shouldn't prime before applying the mud, and you shouldn't mix paint into the mud.
You may find Drywall Texture Repairs for Walls and Ceilings helpful.