Addition Structural Design in Carmel, IN
Adding to a fifteen-year-old Carmel house is a different design problem from adding to an old one, and the difference is mostly about matching rather than reinforcing. The existing structure is sound, documented and built to a known standard. What the design has to do is extend it without creating a seam that behaves differently from either side.
The framing side is largely a matter of specifying compatible engineered products at compatible depths so floors line up and deflect similarly. Two rooms framed to different stiffnesses meeting at a doorway will eventually tell you about it through the flooring.
The foundation side is where the age of the house actually matters. If the original backfill is still consolidating, a new foundation placed alongside it needs to bear below that zone on undisturbed ground, and it needs to tie to the existing footing in a way that accommodates the two settling by different amounts rather than resisting it.
What We Look At Here
- Existing framing: product type and depth, to specify a compatible addition
- Beam and header sizing with deflection limits matched to the existing floors
- New footing depth relative to original excavation and backfill zones
- Connection detail between new and existing foundation, allowing for differential settlement
- Load path where the addition removes or modifies an existing exterior wall
- Lateral bracing where a large opening is created in what was a braced exterior wall
More on the service itself: Addition & Remodel Structural Design. More on the area: Carmel.
Questions
Frequently Asked Questions
Do I need an engineer for an addition in Hamilton County?
Permit applications for structural work generally require sealed drawings, and an addition changes load paths in the existing house as well as adding new ones. Confirm current submission requirements with the building department, as local processes change.