TL;DR
An insulation depth marker is the ruler card stapled to attic framing that lets anyone confirm blown insulation thickness from the hatch without crawling the attic, required by the IRC at one marker per 300 square feet, faced toward the access, with numbers at least 1 inch tall. Installers also leave a dated attic card stating the product, R-value, coverage, and bag count, which together document that the contracted depth was actually blown.
What it means
An insulation depth marker is the ruler card stapled to attic framing that lets anyone confirm blown insulation thickness from the hatch without crawling the attic, required by the IRC at one marker per 300 square feet, faced toward the access, with numbers at least 1 inch tall. Installers also leave a dated attic card stating the product, R-value, coverage, and bag count, which together document that the contracted depth was actually blown. Settling over years shows plainly against the markers, useful at energy audits and home sales.
Where it sits in the glossary
Insulation depth marker is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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