Nancy Rhodes C
Nancy Rhodes C
  • Hometalker
  • Bessemer, AL
Asked on May 17, 2012

My screened back porch is 12X20. It has two supports one end and 3 on the other end. Across front there is a little

Nancy Rhodes CKMS Woodworks3po3

Answered

deck with steps off both ends so I would say about 4 supports - all supports are in concrete. There is also one support in the very middle of the floor. I worry that the porch is not on a firm foundation. If ever I wanted to glass it in would it have adequate support? There is gravel underneath the floor and the floor stands about 2 1/2 to 3 feet off the ground. Need I always worry?
3 answers
  • 3po3
    on May 17, 2012

    I'm sure folks smarter than me can offer their input here, but I would suggest consulting a structural engineer before glassing it in. The peace of mind will be worth the cost.

  • KMS Woodworks
    on May 17, 2012

    Minimum load for most decks is 40 psf live load, which is also about the same for most interior rooms. Where some of the problems may arise is if this space is "walled" in, will have to due with "load paths". Walls should be place directly over supports, to provide a continuous load path to the foundation. Most deck designs are cantilevered to some degree, so this path is not present along the perimeter where the walls would be placed. The SE (structural engineer ) would need to verify if the joist and load beams are sized to take the wall loads.

  • Nancy Rhodes C
    on May 17, 2012

    I do need a structural engineer if I decide to enclose the area. I hope meanwhile the pitched roof to the porch is not too heavy. I am a worry wart. Thanks for your input. Colorado folks are nice.

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