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Large louver banks need a managed base water path. Do not set them on raw concrete without the approved pan/flashing/end-dam detail.
['Big louver banks can take real rain load. The bottom of the opening needs a way to collect and direct water back out. Raw concrete can absorb water and let it migrate into the wall or penthouse.', 'Before final setting, check the sill pan, end dams, drip edge, bed sealant, and weep path. If the pan is missing, hold the install and coordinate a proper metal sill pan or envelope detail before anchoring the frames permanently.']
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