Exposed meaning the beam to view, uncased, OSB = uglyFor a patio I assume exposed, you don't want to see that either.
We are never asked to add plywood or glues to a beam like that just the number of nails to be used to make them act as one. After inspectors and or engineers have approved the installation, they are often dressed out to be pretty and often look to be much larger that they are.Using the OSB as “filler”. beam will be faced out so moisture not an issue.
The hanger you use is the thickness of the steel and the number of nails holes. They come in 3" for the double and a variety of width for other uses.The beam will be roofed on the top and T&G on the bottom. The outside will have a fascia and gutter. Yes, my original post did make it seem that the beam would carry the entire 20’. I have used the OSB in making interior headers so the siding and/or Sheetrock doesn’t need to be shimmed , also in this case I want the Simpson brackets to fit and snug as possible
The hanger has to be rated for the load it will carry, they are not all equal in strength. The bigger the load, the thicker the steel is and the more nails needed.“... The hanger you use is the thickness of the steel and the number of nails holes“...
Not sure what you mean above
No.Do (2)2x10x20’s sandwiched between 1/2“ strandboard have the same strength and span capability that a solid 4x10x20 does? Thx, Pete