Hello,
I recently installed a 44″ wide by 5″ deep dome medallion in my DR. Joists that were cut were essentially trimmed to depth and sandwiched with 2 x 8’s that extended three feet behind the cuts and joined via crossmembers to the uncut joist (also reinforced with a single 2×8). My next project involves a similiar dome but 60″ dia and 10″ deep in the two story foyer.
I plan to frame out the I-joist where the dome will be placed since 10″ deep nearly eliminates the joist. Considering the roof suspension, how much more reinforcement should be needed both in length and width to the remaining uncut joist?
Thank you.
Replies
Depends. Depends on the span of the joist, what loads it supports, is it stick framed or trusses, ... Hate to tell you, but if you trimmed the DR joists 5" you essentially rendered them useless for any supporting loads.
"Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
Joist spans the width of the house (~40ft) and trusses. This area supports a roof peak.
The DR joist that were cut were reinforced on both sides with the 2x8's through the length of the cut and 3-4 ft beyond. Installed 6 mo ago with no sag, creaking or signs of trouble both in the DR and the bedroom above.
I don't understand. Did you say these are 40 ft span trusses that you cut?"Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
I apologize for any confussion. What I was describing was how I handeled a smaller dome in my DR that was finished several months ago. My questions now pertain to handeling a similiar dome, although larger, in an area that supports a roof peak as opposed to a floor.