TL;DR
PSI, pounds per square inch, is the pressure unit trades use to rate everything from concrete strength to washer output. In concrete work it states compressive strength at 28 days—3,000 to 4,000 for residential slabs and driveways per ACI guidance—verified by crushing test cylinders.
What it means
PSI, pounds per square inch, is the pressure unit trades use to rate everything from concrete strength to washer output. In concrete work it states compressive strength at 28 days—3,000 to 4,000 for residential slabs and driveways per ACI guidance—verified by crushing test cylinders. In pressure washing it measures spray intensity, from about 1,500 for house siding to 4,000 for stripping concrete, where the number works together with gallons per minute to set cleaning power.
Where it sits in the glossary
PSI 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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