membrane
MEM-brayn
/ˈmɛm.breɪn/
A pliable sheet of synthetic material functioning as a continuous waterproof barrier on roofs and walls.
On flat or low-sloped commercial roofs where traditional shingles cannot shed water effectively, single-ply rubber or PVC membranes form a continuous, watertight skin.
The story behind the word. Derived from Latin 'membrana', meaning skin or parchment prepared from animal hide (from 'membrum', limb). Just as animal skin serves as a flexible waterproof barrier for living tissue, roofing membranes encapsulate building roofs.
Word relationships
- sheeting: Sheeting is a generic term for thin material sheets, whereas a membrane specifically acts as an engineered fluid barrier.
- porous layer: A porous layer permits air or water flow, whereas a waterproof roofing membrane completely blocks liquid passage.
Commonly confused with
- underlayment: Underlayment is covered by upper layers like shingles; a roofing membrane is often the exposed final roof deck surface on flat roofs.
Word family
- membranous (adjective): Resembling, consisting of, or functioning as a membrane.
Collocations
- waterproof membrane
- EPDM membrane
- single-ply membrane
- roofing membrane
Example sentences
- "Commercial flat roofs rely on heat-welded rubber membranes to prevent standing water from seeping into offices below." Commercial roofing architecture
- "The contractor sealed the overlapping seams of the waterproof membrane using a specialized hot-air gun." Flat roof installation
Memory hook
A MEMBRANE acts like a flexible protective SKIN on the roof. Waterproof outer skin.
When not to use
In biological contexts, membrane refers to cellular walls or organic tissue; specify roofing membrane in structural contexts.
Fun facts
- Modern white TPO roofing membranes reflect over 80% of solar heat radiation, drastically lowering summer air conditioning demands for giant distribution warehouses.
Related words
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