Why pad matters
Pad cushions foot traffic, extends carpet life, and improves insulation. Carpet without pad wears fast and feels thin. Order pad in the same square yards as carpet (with the same waste allowance).
Pad types
Density (lb) matters more than thickness for durability. Soft thick pad feels plush on day one but can crush and wrinkle carpet in hallways.
- Rebond (recycled foam): most common residential — 6–8 lb density for living areas
- Memory foam / frothed foam: premium feel — match carpet manufacturer max thickness
- Rubber: dense, durable — good on stairs and high traffic
- Moisture barrier pad: basements or slab-on-grade — not a substitute for fixing leaks
Thickness rules
Too thick pad on stairs or with some carpets causes wrinkling. Many carpets specify max 7/16 inch pad. Check carpet warranty before buying thick plush pad.
Stairs and landings: thinner, denser pad (often rubber) so treads stay firm underfoot. Matching living-room plush pad on stairs is a common comfort mistake.
Square yard ordering example
Room 12×15 ft = 180 sq ft ÷ 9 = 20 sq yd carpet. With 10% waste → 22 sq yd. Order pad to match 22 sq yd — pad and carpet are sold separately but same area. Use the carpet calculator to convert feet to yards automatically.
Seams, tape, and install notes
Pad seams should be taped and should not line up directly under carpet seams. Installers stagger them on purpose — if you are DIY stretching, plan pad layout before cutting carpet.
On concrete, a moisture-barrier pad helps vapor, not floods. Fix drainage and leaks first. See how to choose carpet for fiber picks by room.