Guide · For the trade
Wool vs polyester carpet: which fiber for which room and how to read the two on a spec sheet
Wool vs polyester carpet comes down to resilience against cost: wool recovers from crushing, hides soil, is naturally flame resistant and self-extinguishing and lasts 15 to 25 years in a residential room; polyester is the least expensive carpet fiber, resists water-based stains and fading because it is usually solution dyed and mats in a traffic path in 3 to 5 years because the fiber does not spring back. Specify wool for living rooms, halls, stairs and any room meant to last; polyester for bedrooms, guest rooms, closets and budget-led jobs; and a woven polyester where the client wants a wool look at a polyester cost.
This guide is for the designer choosing between the two on a residential spec and the junior comparing two sample books: what each fiber is, the comparison in numbers, where each belongs, the woven polyester exception and the questions clients ask. The nylon vs polyester guide covers the other synthetic.
What the two fibers are
Wool is the staple fiber from the sheep, spun into a plied yarn and woven, tufted or hand-made into carpet; New Zealand wool is the whitest and the standard for pale colorways, British and Indian wools coarser and more resilient. Each fiber is a crimped protein filament with a scaly surface and a lanolin coating, which is why wool hides soil, sheds a water-based spill for a minute or two and springs back after a chair has sat on it. Polyester, PET on a spec, is a petroleum-based or partly recycled plastic extruded into filament, usually solution dyed, meaning the color is in the polymer rather than applied afterward. It is smooth, bright, soft and hydrophobic, which gives it its stain and fade resistance and it has low resilience, which gives it its reputation for matting. Triexta, PTT, is a polyester cousin with better recovery and has its own guide.
Wool vs polyester carpet, in numbers
| Property | Wool | Polyester (PET) | What it means on the spec |
|---|---|---|---|
| Resilience | High; recovers from furniture and traffic | Low; mats and crushes in paths | Wool for halls, stairs, living rooms; polyester for bedrooms |
| Stain resistance | Natural lanolin; stains with wine, dye and oil | Resists water-based stains; attracts oil | Polyester for a kids' room; wool with a stain treatment elsewhere |
| Fade resistance | Good; dyed fibers can fade in direct sun | Excellent when solution dyed | Polyester in a south-facing room with no window film |
| Flammability | Naturally flame resistant, self-extinguishing; Class I common | Melts; passes the pill test, Class I in dense constructions only | Wool where a Class I rating is required |
| Soil hiding | Excellent; matte, scaly fiber | Fair; bright fiber shows soil in light colors | Polyester in mid-tones and patterns |
| Typical life in a living room | 15 to 25 years | 5 to 8 years | Wool for the long-term client |
| Typical life in a bedroom | 25 years and up | 10 to 12 years | Either |
| Cost rank | Highest of the common fibers | Lowest | Polyester when the budget sets the fiber |
Where wool belongs
Anywhere the carpet is meant to outlast the furniture. A wool cut pile or loop in a living room, a hall, a stair or a primary bedroom shows a path later and recovers from it better than any synthetic, takes dye in colors polyester cannot reach and is the fiber for hand-loomed, Wilton and Axminster constructions, which polyester rarely comes in. On a spec sheet read face weight, 40 oz and up for a room with traffic and pile height, under 1/2 inch for stairs and halls. The library has 1,397 wool broadlooms from Prestige Mills, Couristan, Emery Park, Cella Carpet, Bellbridge and Antrim and Masland's wool styles carry Class I radiant panel ratings with CRI Green Label Plus certificates. The New Zealand wool guide goes further.
Where polyester belongs
Rooms with low traffic and a real chance of spills or sun: a child's bedroom, a guest room, a closet, a bonus room, a rental, a staged property. There polyester's stain and fade resistance are worth more than resilience and its softness, genuinely better than most nylons, is what the client feels. Specify a solution-dyed, high-twist polyester at 40 oz or more in a mid-tone or a pattern, keep it out of the hall and off the stairs and tell the client the realistic life.
The woven polyester exception
A polyester that is woven rather than tufted behaves differently. Kane Carpet weaves 183 Wilton styles in a fine heat-set polyester and Couristan machine-weaves polyester patterns on a Wilton loom; in a woven construction the yarn is locked into the backing at high density and low pile, so the matting that ruins a 3/4 inch tufted polyester plush does not happen in the same way. These are the polyesters that can go in a dining room or a living room with a wool look and a wool pattern range, the ones we show a client who has priced wool and stepped back. They are still polyester in the hall and on the stair, where wool or a wool-nylon blend is the better fiber. The woven vs tufted guide explains the construction.
Wool vs polyester rug: the same rules, smaller
For an area rug the comparison holds. A hand-tufted or hand-loomed wool rug keeps its pile and edges for decades; a polyester rug flattens where the sofa feet sit and along the walking line inside two or three years and the bright fiber shows the path in light colors. Polyester rugs earn their place in a child's room, a playroom or a seasonal house where replacement is part of the plan; for the living room and the dining room, wool, a wool-nylon blend or a woven polyester.
Questions designers ask
Which is better, polyester carpet or nylon carpet?
Nylon in any room with traffic: it is the most resilient synthetic and the one that lasts in a hall or a family room. Polyester wins on stain resistance, fade resistance and cost, which makes it the better bedroom fiber. Neither matches wool for recovery or for flame resistance; the nylon vs polyester guide has the full comparison.
What does a wool carpet look like compared with polyester?
Wool is matte with depth: the fiber scatters light, so colors read soft and the surface looks like a textile. Polyester has a sheen and a brighter, flatter color and a plush has a glossy look in raking light. Side by side under a window the difference is obvious; in a photograph it often is not, which is why the sample matters.
What is the disadvantage of 100 percent wool carpet?
Cost, first. Then shedding and some pilling in the first six months, sensitivity to alkaline cleaners and bleach, permanent stains from wine and dye-based spills if they sit, moths in a dark closet and a lower tolerance for damp. An 80/20 wool-nylon blend answers the wear objection; the wool blend carpet guide covers it.
What are the different types of carpet fiber?
Five cover almost everything: wool, the natural standard; nylon, the most resilient synthetic; polyester, the least expensive and most stain resistant; polypropylene, the hydrophobic flatweave and outdoor fiber; and triexta, the polyester cousin with better recovery. Blends, mostly wool with nylon or polyester, sit between their parents.
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