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Old 03-22-2008, 02:23 PM   #1
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existing CMU Shear Wall


Can anyone give me an idea of what the process would be for cutting an opening for a door in a CMU Shear wall? How would the loss of structure be compensated for?

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Old 03-22-2008, 02:40 PM   #2
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existing CMU Shear Wall


Structural Steel Lintel, or steel beam.

If it is a commercial wall, you may need to get some documentation as to the weight baring capabilities of the lintels/beam spec per opening dimensions.

Contact a local steel supply company.


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Old 03-22-2008, 04:08 PM   #3
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existing CMU Shear Wall


What makes you think it is a shear wall? If it is not a shear wall you may be making a mountain out of a mole hill.

What kind of structure? What is the wall height? What puts the shear load into the wall? What is the floor system above? Are you in a seismic or hurricane area?

For a block wall in a wood frame structure, the vertical loads are not inportant because the masonry is many times (10X?) stronger than a wood frame wall. You just have to span over the opeing you created for vertical support.

Once you cut a door-size opening in a real SHEAR wall, you dramatically decrease the shear strength of the building. Beams and lintels do little for SHEAR, but they are necessary to span over openings and possibly necessary if you have to tie the two sections together and do not have a rigid diaphragm floor above.

Find out if it is really a shear wall and what the shear on it is. The two shortened sections of the wall that are left may be adequate, but who knows now without any information.

Dick
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