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I would like to install a tin ceiling in a back shed which was added on to the house. It currently has a sloped roof/ceiling. The room is 12’x 7′ According to the June, 1998 issue of “The Family Handyman” magazine, I need to attach the tin to 1/2″ plywood. There are no horizontal rafters. What size ceiling rafters would I need to install to attach the plywood to that could safely span the distance & hold the weight? I will be insulating on top of the ceiling as well. The exterior wall is framed with 3 x 3’s and the interior wall is brick. I assume I would use joice hangers to connect the rafters to the exterior wall. Any suggestions as to the best way to attach the rafters to the brick wall? Thanks!
Brent
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Are you saying that the span of the ceiling joists will be just 7'? If so, how about using 2x6 ceiling joists that are notched on each end so as to sit on a 2x2 ledger. The 2x2 ledgers must be nailed (attached) into something solid (ie a wall stud or the brick wall) with min 3 12p nails below each ceiling joist.
I really don't like notching joists like this, but it is acceptable (according to our code) and the only weight that the ceiling joists will be supporting is the ceiling itself.
If attaching to the brick wall, as described above, is too difficult, perhaps you could first attach a 2x6 band to the brick wall, then attach the ledger to that (with the 3 nail per joist pattern. Or, you could even put a band on each end of the 7' span.
Joist hangers could be used instead of the ledgers but, again, they must be nailed into something solid.
Here is a span chart for my building jurisdiction. Don't know what is required for yours.
http://www.co.wake.nc.us/inspect/buildinginspections/buildinginspections.htm
When looking at the chart, if I understand your description correctly, the last classification "Ceiling Joist - No Attic Storage" in the part of the table that you are interest in.