Hatch is Too Small

What about a 12" extension or beam on 2 of the sides?

What 1/2 is your avatar?

Ask me a toughie! Weld yourself an ell shaped flange onto the puppy so that you get coverage and a safety lip. Now if the hatch had been too big, you might have had a problem.

Ah. I revel in my Godlike powers

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First of all make sure your slab hasn't got them damn stress cables! If you mess with them, they'll mess with you(literally). Second if it has a steel flange already imbedded, just add 6" plate steel to each side. Third if it's just some rebar and concrete, just break away some concrete and form up for a new pour for the proper dimensions. Make sure to drill for and epoxy steel dowels each way. Don't remember the exact requirements; but, I think its like 6" for #5 rebar. Or break away at least enough concrete to get a lap on your steel at least 3 to 5 times the diameter of your rebar(Check code in your area).

Thanks for the help.

The architect has agreed to use 2 bent angle as inserts. They are reinforced and will be supported with Hilti anchors. I wish I could insert a drawing so all of you can have a look at it but they also want some flashing to go around it where it is short which I think is a waist of time and money.

Thanks again.