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I have 1/2" drywall in my attached garage. There is living space above it so current code would say to use 5/8" Type X fire-rated drywall. My house was built in 1977 so I was wondering when the building code was updated to the Type X drywall for such spaces.

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1978... This is going to completely depend on where you live. Your location will determine which building code applies, and is also needed to determine when the applicable code was adopted in your area. –  Tester101 Dec 2 '13 at 13:50
Regardless of whether your house was built wrong or right 35 years ago, you can add a layer of 5/8 to the ceiling now and make it "more up to current standards" if you have concerns about fire, garage, and living space. Not all that uncommon to have it built as unfinished space and then remodeled to living space without addressing such details. How easy/hard/legal/illegal that is or was when done does vary considerably with exactly where you are. Fixing it varies somewhat less. –  Ecnerwal Dec 2 '13 at 15:06
Thanks for the info. Looks like buying a house built in 1978 or later can have more advantages than just the lead paint restriction. Understood that each community may not have updated the codes until after 1978. Thanks for the tip about adding drywall over the existing. I'll need to see if that is ok with my local codes. This question was put on hold but you guys gave me the answers I was looking for. Thanks again. –  joe Dec 3 '13 at 0:14
You are free to edit the question - the hold was for being unclear, and my comment was aimed at what seemed to be the most likely reason you were asking, and the question I thought you were really trying to ask. But you are the best person to clarify that, and it might bring some further insight. Double-layer drywall is actually a normal firewall technique (though with type X) so it should not be a problem with codes, if you use the correct length screws. If the question gets edited and unlocked I'll delete these comments and put them in an answer. –  Ecnerwal Dec 3 '13 at 2:25
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closed as unclear what you're asking by Tester101 Dec 2 '13 at 13:51

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