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We are currently in the process of opening up the space between the living room and family room on the first floor. The house is a 2 story, 2600 square foot colonial modular house.

The wall we would like to replace with a LVL beam is the marriage wall between the rooms that is 2- 2x4's and 2- 1/2" pieces of OSB. We have a full poured concrete basement with steel support beams spread. From the left the spacing is 7' from wall, then the next one is 9'from that beam then 5'from that beam. The section of wall would have to be replaced with a 17 foot beam. The LVL beam would between the red squares are in the photo. We want to keep the existing post where the red square is between the morning room and the foyer which is roughly 8"x8".

The house was designed with a 40 psf live load and a 12 psf dead load for the floor. Attempts be in contact with the manufacture/builder of the house have been unsuccessful.

Initial research has shown 3-14" LVL beams to cover that span but we would like to keep the drop to a minimum but maintain the full structural integrity of the house built which is very high.

Please let me know if you need any other information to provide.

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    Do you know what size floor joists are used? And I assume they run from to back (top to bottom in the picture)? – SteveSh Jan 17 at 15:50
  • By the way, kudos for a nicely done first post. The diagram is very useful, and it seems like you took some time to do some research before asking for advice here. – SteveSh Jan 17 at 15:52
  • @SteveSh Thank you.The floor joist for the first floor are measured at 9". Yes they run top to bottom in the picture. Since the house is joined in the middle it would make sense to use 2 - 3.5" lvl beams with two 1/2" OSB between them to match the thickness of the rest of the marriage wall throughout the house. I am unsure the depth necessary since this house was connected in two sections and will be using two 3.5" beams with the osb – Stephan Jarmak Jan 17 at 16:53

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