Garage Listing room

@arch2 

Since you will still be using the space as your garage and/or shop you may consider putting some drywall at selected locations on the walls to help reduce the amount of absorption in the space. 

I was thinking the exact same thing. Perhaps 2' drywall strips (spaced 2' apart), and add more as necessary. Yep, needs reflection.

I would also consider plywood or OSB, but as you say, it's still costing a fortune compared to gyp board.

arch2

Yes on your reply, Take advantage of the absobtion of the insulation.

If I would cover all the walls with wall board would end up with a lively mess

Well Here is what ive done so far,

Finished the ceiling with 5/8 wall board,

Still sounded dead,  Did all walls with 1/8 hardened hardboard, actually  worked very good, Flatter then my other room!!

Nice! Glad to hear your are making progress and improvements 👍🏼

So far so good with the hardboard. Congrats. Am I correct in assuming you will still work to alleviate the first reflection issues? Good project!