McKnight Crossings Church of Christ
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On October 24, 2025 Tom Hunsaker and Bret Blackford put a tarp over the exhaust fans on the RTU that to
have a leak (a clogged drain pan possibly). Rain is expected over the weekend and if no leaks/drips
found in room 112a it is a good sign leak from water entering these exhaust fan holes.
Click any image for full-size view
Back in November 2024 Tom Hunsaker and Bret Blackford put Gorilla Waterproof Tape on some split HVAC
duct joints. There were noticable gaps in the HVAC vent seems and it was thought water was leaking into
room 112a from here. Leaking seemed to deminish after this tape sealing of the ducts.
◆ Video of this also avaiable at link
here.
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Click any image for full-size view
Background:
The original structure—containing the worship auditorium—was built in the 1970s. Around 2005, an addition was made, which includes the gymnasium, classrooms, and office area. The gym roof has a slight pitch, but the rest of the roof (old and new) is flat. Construction consists of steel beams, corrugated steel sheeting, and a rubberized roofing material layered on top for waterproofing. The older section uses white rubberized material; the newer section uses black.
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Drainage - Old Section:
The original roof has several perimeter drains, which must remain clear of leaves and debris. When clogged, water pools quickly—sometimes accumulating several inches—which can:
◆ Leak into HVAC ductwork or interior spaces
◆ Add significant weight (over a ton), stressing the older structure
◆ Attract geese, possibly drawn to standing water, leaving behind droppings that accelerate material breakdown
The roof is not sloped so water runs to the drains, so it occasionally requires pumping from central areas to prevent pooling, reduce leakage risk, and clean goose waste.
Drainage - New Section:
The newer roof has a slight slope directing water to edge gutters rather than internal drains. This generally works well, though fall leaves can block gutters and interfere with proper drainage.
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Areas of Concern:
Rusting Corrugated Sheeting (Old Section - South End):
This is the most serious issue. Over the baptistry area at the far south end, the corrugated steel is showing significant rust and soft spots. This area should be avoided when walking on the roof. Water tends to pool here, so occasional pumping is beneficial. Eventually, this section will need partial replacement of the rusted sheet metal (though the underlying joists appear sound).
◆ South roof rusting - Visual of deteriorated corrugated metal – [link]
HVAC Duct Seams (New Section - Minor):
In the newer section (gym and classrooms), leaks have often stemmed from seams in the HVAC ductwork rather than the roofing itself. In Fall 2024, Tom Hunsaker and I identified a split in a major duct seam and sealed it with caulk and rubberized waterproof tape, which greatly reduced water entry. There may be a few remaining areas that need similar attention.
◆ Patching HVAC Vents on Roof - Nov. 2024 [link]
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Recommendations:
◆ Continue regular cleaning of roof drains, especially in the older section
◆ Periodically (2x/year) inspect and maintain HVAC ducts for exposed seams or potential leaks
◆ Clean goose droppings occasionally to reduce slip hazards and preserve roofing material
◆ Monitor rubberized roofing for any signs of wear (rips, punctures, tears), though overall it still seems to have several years of life left
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Thoughts on Using a Roofing Contractor:
Unless we’re ready to give a contractor very specific direction, I’m not sure there’s much value in having someone "take a look." In my experience, this often leads to a sales pitch rather than a meaningful assessment.
At some point, we’ll need bids to replace the rusted corrugated sheet metal over the south end, but I don’t think we’re there just yet. Also, I’d expect Tom would need to accompany any contractor, which could pull him away from other important work.
(As an aside: It’s a bit like asking an insurance salesman to evaluate your policy—there’s a good chance they’ll suggest more coverage, whether it’s needed or not.)
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Refernce Videos:
◆May 2024 - Severely clogged drains causing leakage – [link ]
◆South roof rusting - Visual of deteriorated corrugated metal – [link ]
◆Patching HVAC Vents on Roof - Nov. 2024 [link ]