Need Ceiling Joist help - Long Span
We want to add a garage to our house. 28' x 42'
How do I span 28 feet with ceiling joists?
This is what the add-on to our house will look like.
This is the foundation layout for our garage.
The garage is 28x42. A little mudroom connects it to the house.
Because the mudroom floor is at the same height as the house, the ceiling of the garage
has to be raised where the door comes out of the mudroom and into the garage.
The mudroom will be divided into two spaces. One will be a laundry room.
Because of the pitch of the room and the different floor heights,
one section of the ceiling in the mudroom will be sloped with the room.
The divider wall will be on the right side of that door.
Another door will exit the mudroom to the back yard.
That little deck will wrap around the back side of the
house to meet the back deck.
So how do I construct the roof. I have to span 28 feet
for the garage. I can't use trusses because I have to match
the original house roof, approximately 4.5/12
The garage walls will be 2x6 framing. I wanted to use
I Joists for ceiling joists but because of the span the
I Joists would be too tall and I couldn't bevel them to
match the rafters. I'm going to put a steel roof on it,
and the house while I'm at it. Do I need OSB on the roof?
I keep looking at span tables for I Joists but I don't
know how to figure the loading. Nothing will be stored
in the attic. It will just be blown in insulation up there.
So how do I frame this. How do I span 28 feet.