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Wood Screened Porch - 3 Season Room Lateral System

Wood Screened Porch - 3 Season Room Lateral System

Wood Screened Porch - 3 Season Room Lateral System

(OP)
Do we have any good solutions for a screened porch or 3-season room lateral system? Either free standing or attached to a wall of a home (assuming the roof is no tied into the house roof, but rather frames into a gable end).
Possible Ideas:
  1. Wood “moment frame” – notch and/or bolt the roof beams into the columns. We would need deeper roof beams.
  2. Gussets or kickers at post to beam connections.
  3. Embed the posts in the foundation so that they cantilever up to the roof
  4. Use a short wall at the corners
  5. Tie into the existing.
I'm get push back with all of these. Usually the floor of these is elevated (think walk-out basement) as well, so #3 really isn't an option.

EIT
www.HowToEngineer.com

RE: Wood Screened Porch - 3 Season Room Lateral System

With an elevated floor I've done a cantilever column idea just by extending the column past the floor plate a bit and then designed the connection at the base of the column and the floor plate for the lateral reactions.

RE: Wood Screened Porch - 3 Season Room Lateral System

I use 2 to 3 foot high plywood shear walls between the wood columns to develop a moment connection for the columns. Rest above is screened.

Mike McCann, PE, SE (WA)


RE: Wood Screened Porch - 3 Season Room Lateral System

We've used a detail where we embed a large steel angle in a concrete pier or pedestal - fixed to the concrete with adequate headed studs and wrapped in a steel rebar cage.
The angle extends vertically out of the concrete for a distance (perhaps 3 ft) and is bolted to vertical wood columns. This forms a rigid base in which a cantilever column system can be developed.

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RE: Wood Screened Porch - 3 Season Room Lateral System

(OP)
Thanks guys. Those are all pretty good. Let's see how it goes...

EIT
www.HowToEngineer.com

RE: Wood Screened Porch - 3 Season Room Lateral System

Quote (RFreund)

Either free standing or attached to a wall of a home (assuming the roof is no tied into the house roof, but rather frames into a gable end)

Is your porch tied into a gable end of the main building? If so, that strikes me as the most logical load path.

While I don't think that you'll find the answer to your specific question there, this is a good and relevant discussion on one of XR250's threads: Link

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

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