Static field route #19635

What do I do when a large louver bank is set on raw concrete with no sill pan?

Sealing, Leakage, Mastic & Pressure Testing🛑 STOP / GET DIRECTIONField answer expansion

📖 Verified core answer

Large louver banks need a managed base water path. Do not set them on raw concrete without the approved pan/flashing/end-dam detail.

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Field verification checklist

Look under the louver frame for a continuous sill pan/flashing.
Check for turned-up end dams and front drip path.
Verify the pan ties into the wall waterproofing.
Make sure the pan drains to the exterior, not into the wall.
Do not final-anchor the bank until base flashing is resolved.

Ask foreman

The louver bank at [location] is sitting on raw concrete with no visible sill pan. I checked the base and drainage path. Do you want a sill pan/end-dam flashing detail installed before final anchoring?

Text to foreman

Route options

A Correct it only if the fix is within your assignment and approved method.

B Hold and document if it affects water intrusion, weatherproofing, rated assemblies, structural anchorage, controls, TAB, or another trade.

C Bring the foreman/detailer the location, what you checked, and what decision you need before sealing, testing, cover, or startup.

Do not do this

Do not set a large exterior louver bank directly on raw concrete and rely only on perimeter caulk.

Why this matters

Missing base flashing can create hidden water migration and structural wall damage.

Final verification

Use this as field training guidance. Final direction still comes from the foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, pressure/material schedule, and AHJ/code requirements.

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