# Cantilever beam

I want to design a cantilever addition. Over the driveway so I can't add supports.

I want to use the calculator here https://calcresource.com/moment-of-inertia-rect.html

But I'm having trouble figuring out the inputs. Specially the Young's Module and moment of inertia. What would those values be for a 3.5 inch x 12 inch glue laminate beam?

The load on the beam will be part uniform and part point load. Can I calculate the deflection for each and add the results together?

• You shall looking for professional (structural engineer) help in the formal setting for your own good. Good luck.
– r13
Mar 12 at 3:28

You have to enter the exact values of your beam usually something like 3 7/16" by 11 7/8" or sometimes in decimal fractions. You need to find the manufacturer's datasheet which will give you pertinent info like the $$f_c,$$ service moisture content, shear values, fasteners, A whole bunch of information.