Germantown, Montgomery County, MD — crawl-space repair-plan review. The plan specifies spray foam, a floor and wall barrier, rim-joist insulation and two vent inserts. It does not record a verified homeowner complaint, completed installation or post-work air-leak test.
At a glance: The specified crawl-space area is approximately 540 square feet. The plan lists about 120 linear feet of wall spray foam and rim-joist insulation, a 20-mil floor vapor barrier, a heavier insulated wall liner, and two foam vent inserts. These are planned components, not proof that this house had a particular draft or that the work was completed in one day.
What is the difference between insulation and air sealing?
Insulation slows heat transfer through an assembly. Air sealing addresses gaps that let air move around that insulation. Spray foam may serve both functions in suitable locations, but a product line item cannot identify the exact air-leak path at a specific home. That requires inspection, and a performance claim would require appropriate follow-up testing.
Why does the plan include both a floor barrier and a wall liner?
A floor barrier is intended to limit moisture vapor from exposed ground. A wall liner treats the vertical perimeter. The repair plan lists a 20-mil floor material and a heavier foil-faced wall material. Thickness alone does not demonstrate thermal performance or a watertight installation; fastening, seams, terminations and penetrations matter. Those details need completed-site documentation.
What do the two vent inserts address?
The plan calls for two foam inserts at existing vent openings. In an appropriate encapsulation design, closing vents can reduce outdoor air entering the crawl space. But the plan does not prove that the vents were the only source of a draft, nor does it establish how the finished space was conditioned or monitored.
What evidence would turn this into a completed project story?
We would need the original customer request, the completed work record, photos linked to this property showing the floor, wall, vent and rim-joist details, and any relevant post-work observations. The previously shown images could not be matched to this plan, so they have been removed from the article.
For a broader explanation of crawl-space sealing choices, see our crawl-space repair guide. The right scope depends on the actual moisture and air pathways, not on a fixed package.