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Architecture/I beam for extra support for garage Ceiling


Dear Sir,
I have garage that is 18.58 (223 inches) feet wide  and is 20.56 (246.75 inches)  feet long.The Joyce is 2"X"X' The garage is attached to my home. The house is 63 years old. I would like to use the area above the garage for some storage ass small saws, some wood, toys, boat equipment and a small air compressor and some of my hobbies stuff with a pillow stairs. To give the ceiling extra support I want to put a I beam across the center of the garage with two support post each end.I thought I would treat it as a second floor to be safe. The Question:  What type and size beam do I need?

Hi Greg,

You should contact a structural engineer to size this for you. He or she should be able to do it relatively quickly if you provide them with some basic information. If you are adding posts, you may need to add footings in the concrete slab. Resting posts on a concrete slab without footings will usually lead to cracking the slab since it was never sized to be bearing a point load.

Hope this helps. Good luck!

Nazim Nice
Principal / Architect
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Nazim Nice


I am a Seattle Architect and can answer architecture and design related questions. Ask me about material suggestions or usage. Ask me about design options - what is good design and what is bad. Ask me about choosing exterior house colors and furniture layout options. Ask me about detailing and assembling houses or components in the home. Ask me about green design or materials. Ask me about choosing an architect, the architectural services, basement remodels, second story additions, and whole house remodels. Ask me about garage design, bathroom remodels, laundry and mudroom design, family room additions, and roof deck additions.


Over 12 years of practice in the Architectural field including three years of internship plus 5 years of school. I have taught at the Knowlton School of Architecture at the Ohio State University and lectured at Carnegie Mellon University. I currently own and run the Seattle Architecture Firm, Motionspace Architecture + Design PLLC.

National Council of Architectural Registration Boards (NCARB, Seattle Architects | Motionspace Architecture + Design. More information at our blog the (un)common house. Lumen ID Custom Engraved Switch Plates with Labels.

BArch from Carnegie Mellon University & Andrew Carnegie Scholar

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