SoFaKingCity

this is going to be a lot harder than I thought it will be.

glennjanie

Good Morning, SoFaKingCity:
I am going to have to agree with Inspector D and Square Eye. Put another joist in between each 4' space, suspend it with 5 2 X 4s on each one to stabilize it and use gypsum wallboard for the ceiling. If your garage door would interfere with that ceiling; you may want to consider raising a section of ceiling to clear the door.
It will take some extra work but it is not hard work, just time consuming.
Glenn

JOYCEHORAN

What about using 3/8 plywood for garage ceiling? Would 24" rafters support that weight.

squirly

hi all: i"ve recently insulated my garage ceiling with r20 insulation inbetween the rafters and then covered it with plastic just wondering now if this o.k I live in central ontario canada. Then wondering if this don"t rote out my roof.

nealtw

Welcome squily: In the future start a new thread intead of pulling up an old one.
No; the insulation wants to breath on the open side, if you are heating the garage the poly should be under the insulation. If you really want to cover the insulation, I can't think of a good reason, but you would use house wrap. It would protect it from wind and rain but still allow moisture to evaporate thru it.