Blocking knitting: wet, steam and spray, explained

Blocking is the finishing step where you wet (or steam) a finished piece of knitting and shape it to its final measurements as it dries. It evens out the stitches, sets the fabric, opens up lace, and takes a piece from "hand-made" to finished. There are three methods: wet, steam and spray. Choosing the right one depends mostly on the fibre.

What blocking does (and doesn't do)

Blocking does: even out wobbly stitches, set the final dimensions, bloom the fibre (wool softens and fills out), open lace patterns dramatically, and let you match pieces to the same size before seaming.

Blocking doesn't: fix a wrong gauge or rescue a garment knitted the wrong size (blocking is shaping, not stretching); permanently cure stockinette curl (it tames it; the curl creeps back); or last forever. Re-block after every wash; it's simply how the garment is dried from then on.

Wet blocking (the standard for wool and animal fibres)

The full method, and essential for lace:

1. Fill a basin with cool to lukewarm water, never hot, and a splash of wool wash (no-rinse types are easiest).
2. Submerge the piece and press out the air bubbles. Don't agitate or rub: animal fibres can felt.
3. Soak 15–30 minutes, until fully saturated.
4. Lift it out supporting the whole weight with both hands: a soaked knit lifted by one edge stretches permanently.
5. Squeeze gently. Never wring or twist.
6. Roll the piece in a towel and press firmly, getting it from wet to damp.
7. Lay it flat on blocking mats and shape to the pattern's finished measurements, tape measure in hand. Pin with rust-proof T-pins. Always pin lace, generously, or use blocking wires to avoid scalloped edges.
8. Leave until completely dry (24–48 hours), then unpin.

Steam blocking (quick even-out, and the acrylic option)

Pin the dry piece to measurements, then hover a steamer or steam iron above the fabric, never touching, letting steam penetrate in a few passes. Cool and dry before unpinning. It's the quick way to even out stitches, and the only route that does much for acrylic.

Acrylic warning. Direct heat on acrylic melts the stitches into place: knitters call it "killing" the fabric, and it is irreversible. It kills the bounce and drape permanently. Steam acrylic only from a distance, never touch it with the iron.

Spray blocking (the gentle option)

Pin the dry piece to shape, spritz with cool water until damp, leave to dry. Right for delicate pieces, quick refreshes, and superwash wool, which behaves badly when fully soaked: superwash relaxes and can grow by inches in a wet block. Spray keeps it under control.

Which method for which fibre

Fibre	Method
Wool & animal fibres	Wet block (the full treatment)
Lace, any animal fibre	Wet block + pins/wires, always
Superwash wool	Spray block (soaking makes it grow)
Acrylic	Steam from a distance, cautiously
Cotton & plant fibres	Wet or spray; note the "memory" is weaker, so results fade faster

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Common mistakes

• Hot water, wringing, or agitation: felting and permanent stretch live here.
• Lifting a soaked piece by one edge: support the whole weight.
• Stretching ribbing: ribbing usually shouldn't be stretched at all, or it loses its spring.
• Too few pins on lace: spiky, scalloped edges. More pins, or wires.
• Unpinning early: damp fabric loses the blocked shape. Fully dry means fully dry.
• Touching acrylic with the iron: irreversible.