How do you do a knockdown ceiling texture?

I"m in the process of finishing my basement. The drywall is up, mudded, and sanded. What are the steps to do a knockdown ceiling? Does it need to be primed first and then do the knockdown?

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no, you don't prime it, you spray it the same way you would a wall, let it set and then knock down the same way you would a wall. Allow it to dry, then prime it.

It seems like you've done alot of work already mudding and sanding, why would you texture it with knock-down after that??

Contrary to what has been posted.....yes, you DO need to prime the ceiling first.... if you do not.... then the areaa that are drywall, will show thru your texture, as a different color than the areas of joint compound. Ive done this for a living.... if you don't want to have to do it over again....PRIME FIRST, lol.

There are reasons to go ahead and texture a ceiling.. like sound absorption.... in a basement, if you have a concrete floor, this is particularly critical.

If you want to apply knockdown texture, you need a hopper gun, and a good sized air compressor. The 'texture', is actually wall joint compound, that you spray thru the hopper gun.... I'll warn ya now... this is MESSY. Cover everything you don't want texture on, with plastic... including the walls, hehehe. There will be a lot of 'blowback' too... so wear safety glasses, and a dust mask... a cap wouldnt hurt either. Expect to get covered in the stuff, hehehhe. Now... the way a 'knock-down' texture works.... you spray the texture mixture up on the ceiling... let it dry just a bit... and then slide a wide joint knife across it... "knocking" it down... literally. You may want to practice a bit first, to get the hang of it. how wet you make the mixture, how heavy you spray it, and how soon you knife it... all these variables will affect the outcome. (Oh, keep the joint knife running in the same direction too!)

That really is all there is to it... the KnockDown Texture, is one of the simplest and easy to apply textures. Prime first!

Have Fun!

My opinion is slightly different than the 1st posters:

I agree on one point, if you have done a good job on the mudding and the ceiling looks flat, leave it that way. Texturing is simply a way to hide mistakes.

If you still want to texture, then I suggest priming first, here is why -- if you texture straight onto the drywall, you will never get the stuff off. If you prime, then texture, you can scrape it off later if you wish. Additionally, priming the flat ceiling will allow you to see any areas that are not up to snuff. You will be surprised how a good looking ceiling will show problems after priming.

If you prime first and are happy, then you can choose to go flat or texture.

To texture, spray on a popcorn base, then use a large spatula type tool to wipe it down. This gives you something of an orange peel effect. There are many other effects out there.

It's the same as mudding, you need a hopper gun and a compressor. You should tape off the walls, then spray the mud. Wait a bit and knockdown. Then you primer and paint.