PMR
PMR turns up in 2 fields: waterproofing, shop slang. Here is what it means to the people in each one.
PMR in waterproofing
A roofing assembly where the rigid insulation is placed above the waterproofing layer.
A protected membrane roof places the rigid insulation and ballast on top of the waterproofing membrane, reversing the traditional order. This design shields the membrane from ultraviolet radiation, extreme temperature fluctuations, and physical damage from foot traffic. It is commonly used on flat roofs and plaza decks where long-term durability is prioritized.
"We're going with a PMR design for the hospital addition so the maintenance crews don't tear up the membrane walking to the chillers."
PMR in shop slang
A scheduled inspection or service task designed to keep equipment running.
Preventive Maintenance Routine, sometimes called a Record or Request. It dictates the regular servicing schedule for shop machinery to catch wear before it causes a breakdown. Technicians follow these standard procedures to lubricate, calibrate, and inspect equipment at set intervals.
"Check the PMR on the big lathe, I think it's due for a spindle oil change this week."