The Sandshell Spiral Curtain Panel is a lacy, floor-length panel built from square motifs. Each motif has a solid spiral at its center that winds outward like a seashell, inside a frame of open chain mesh. When the motifs are joined, the mesh forms a diamond lattice that lets daylight through, while the spirals give the panel texture and some privacy.
The panel is worked in a single neutral color: oatmeal, sand, or natural beige. One color keeps the look calm and lets the stitch texture stand out. The style suits Scandinavian, boho, and coastal rooms, and it looks good from both sides of a window.
All instructions use US crochet terms. One panel measures 34 x 82 in (86.4 x 208.3 cm) after blocking. Make two panels for a standard pair, as shown.
Construction is simple and repetitive. You crochet 40 identical 8 in (20.3 cm) square motifs, block them, and join them with slip stitches into a grid 4 motifs wide by 10 motifs tall. A three-round border then squares and finishes the edges. The panel hangs from clip rings, so you don’t need a rod pocket.
Finished Size and Construction
- Finished size (one panel): 34 x 82 in (86.4 x 208.3 cm)
- Skill level: Intermediate
- Terminology: US crochet terms
- Yarn weight: DK / light worsted (#3), cotton or cotton blend
- Hook: 4 mm (G-6)
- Number of pieces: 40 motifs per panel (80 for a pair)
- Layout: 4 motifs across x 10 motifs down
- Motif size: 8 x 8 in (20.3 x 20.3 cm)
- Size before border: 32 x 80 in (81.3 x 203.2 cm)
- Border depth: 1 in (2.5 cm) on every side
Materials
Yarn: Use a smooth DK cotton or cotton-blend yarn of about 230 m per 100 g. Mercerized or combed cotton shows the spiral ridge most clearly. Avoid fuzzy yarns, because they blur the mesh.
- Oatmeal / Sand (single color), one panel: 700 g (approx. 1,610 m)
- Oatmeal / Sand, pair of panels: 1,400 g (approx. 3,220 m)
Each motif uses about 14 g. The quantities above include a margin of roughly 10% for gauge differences, joining, and swatching. Buy all the yarn from the same dye lot.
Tools:
– 4 mm (G-6) crochet hook
– Locking stitch markers (at least 2)
– Tapestry needle
– Scissors
– Measuring tape
– Blocking mats, rustproof pins, and a spray bottle
– 9 curtain clip rings per panel, plus a curtain rod
Abbreviations (US Terms)
- ch – chain
- sl st – slip stitch
- sc – single crochet
- hdc – half double crochet
- dc – double crochet
- tr – treble crochet
- BLO – back loop only
- sk – skip
- sp – space
- st(s) – stitch(es)
- RS / WS – right side / wrong side
Special technique – BLO spiral: Rounds 2–6 are worked continuously, without joining, and through the back loop only. The unused front loops form one raised ridge that spirals out from the center. Keep a marker in the first stitch of each round and move it up as you go.
Spiral taper: To end the spiral smoothly, work stitches of decreasing height (hdc, sc, sl st) so the last round slopes down into the edge instead of stopping with a step.
Gauge and Checkpoints
Gauge: 19 sc = 4 in (10.2 cm) along the edge of a finished motif. One completed motif = 8 x 8 in (20.3 x 20.3 cm) after blocking.
Make and block one full motif before starting the rest. With 40 motifs per panel, a small error per motif adds up quickly.
Checkpoints (unblocked, lying flat):
– After Rnd 1: about 1.25 in (3.2 cm) across
– After Rnd 3: about 3 in (7.6 cm) across
– After Rnd 6: about 5.75 in (14.6 cm) across
– After Rnd 7: about 6 in (15.2 cm) across
– After Rnd 9: about 7.5 in (19.1 cm) side to side
– After Rnd 10 (blocked): 8 x 8 in (20.3 x 20.3 cm)
If your motif is too big by more than 0.25 in (0.6 cm), go down to a 3.75 mm hook. If it is too small, go up to a 4.5 mm hook. Don’t change the stitch counts. The border math depends on every motif having exactly 38 stitches per side.
Motif (Make 40 per Panel)
Spiral Center
Rnd 1: Make a magic ring. Ch 1, then work into the ring: 1 sc, 1 hdc, 10 dc. Pull the ring closed. Do not join. Place a marker in the sc. (12 sts)
The graduated sc–hdc–dc start sets the spiral angle.
Rnd 2 (growth): Working in BLO from here through Rnd 6, work 2 dc in each st around. (24 sts)
Rnd 3 (growth): Dc in next st, 2 dc in next st 12 times. (36 sts)
Rnd 4 (growth): Dc in next 2 sts, 2 dc in next st 12 times. (48 sts)
Rnd 5 (growth): Dc in next 3 sts, 2 dc in next st 12 times. (60 sts)
Rnd 6 (growth): Dc in next 4 sts, 2 dc in next st 12 times. (72 sts)
Spiral taper: Continuing in BLO, work into the first 3 sts of Rnd 6: hdc in next st, sc in next st, sl st in next st. (3 taper sts)
The ridge should now run unbroken from the center to the outer edge, with no visible step.
Edge Round
Rnd 7 (conversion): Ch 1. Working through both loops, sc in each of the 3 taper sts, then sc in each of the remaining 69 sts of Rnd 6. Join with a sl st to the first sc. (3 + 69 = 72 sc)
This round evens out the spiral’s sloped edge into a level circle.
Squaring Mesh
Rnd 8: Ch 1, sc in same st as join, ch 5, sk 2 sts, sc in next st, ch 5, sk 2 sts 23 times. Join with a sl st to the first sc. (24 ch-5 loops)
Check the count: 24 loops x 3 sts each = 72 sts used.
Rnd 9: Sl st in each of the first 3 ch of the first loop to reach its center.
- First corner: ch 4 (counts as tr), work (tr, ch 5, 2 tr) in the same loop.
- Side: ch 5, sc in next loop 5 times, then ch 5.
- Repeat 3 times: (2 tr, ch 5, 2 tr) in next loop for the corner, [ch 5, sc in next loop] 5 times, ch 5.
- Join with a sl st to the top of the beginning ch-4.
Count: 4 corners + (4 x 5) side loops = 24 loops worked. Each side now has 6 ch-5 spaces between corner groups.
The tr clusters push the corners out, which turns the circle into a square.
Rnd 10 (trim): Ch 1. Sc in same st as join and in next tr. Work (2 sc, ch 2, 2 sc) in the corner ch-5 sp, then sc in next 2 tr. Work 5 sc in each of the next 6 ch-5 sps.
Sc in next 2 tr, (2 sc, ch 2, 2 sc) in the corner sp, sc in next 2 tr, 5 sc in each of the next 6 ch-5 sps 3 times. Join with a sl st to the first sc and fasten off.
Per side: 38 sc, counted as 2 sc from the corner sp + 2 sc over tr + 30 sc in side sps + 2 sc over tr + 2 sc from the next corner sp. The 2 corner sc at each end are included in the 38. The ch-2 corner spaces are extra.
Round total: 152 sc (4 x 38) + 4 ch-2 corner sps.
Weave in the ends on the WS. Leave the spiral’s front-loop ridge on the RS.
Make All Pieces
Make 40 motifs per panel in Oatmeal/Sand, or 80 motifs for a pair. Block each motif to 8 x 8 in (20.3 x 20.3 cm) before joining. Block them in batches of 10 and lay them out with every spiral turning the same way.
Layout (one panel, RS facing, M = motif):
Row 1: [M][M][M][M] <- top edge (clip rings)
Row 2: [M][M][M][M]
Row 3: [M][M][M][M]
Row 4: [M][M][M][M]
Row 5: [M][M][M][M]
Row 6: [M][M][M][M]
Row 7: [M][M][M][M]
Row 8: [M][M][M][M]
Row 9: [M][M][M][M]
Row 10: [M][M][M][M] <- bottom edge
Joining
Method: Flat slip-stitch join through the outer loops.
- Hold two motifs WS together, with edges and corners aligned.
- Insert the hook through the corner ch-2 sp of both motifs and sl st.
- Sl st through the outer loop of each matching st pair: 38 sl sts per seam.
- Finish with a sl st through both corner ch-2 sps.
The logic is stitch to stitch: sc 1 of one motif goes with sc 1 of the other, through sc 38. Because every motif has exactly 38 sts per side, the seams always match without easing.
Order: First join the motifs into 10 horizontal rows of 4. Then join the rows to each other along the long seams, working continuously across each row. Where four corners meet, sl st through all of the corner sps that touch so the intersection stays flat.
Tension: Keep your slip stitches as loose as the motif stitches. If a seam is shorter than the motif edge next to it, go up to a 4.5 mm hook for joining only.
Checkpoint: A strip of 4 joined motifs measures 32 in (81.3 cm). The joined panel measures 32 x 80 in (81.3 x 203.2 cm) before the border.
Border
Border gauge: 19 sc = 4 in (10.2 cm), the same as the motif edges.
Rnd 1 (trim): With the RS facing, join yarn in any outer corner ch-2 sp. Ch 1, then work around the panel:
- In each outer corner ch-2 sp, work (sc, ch 2, sc).
- Along each edge, sc in each st.
- Skip the ch-2 sps at the seams. Do not add any stitches at the seams.
Join with a sl st to the first sc.
- Top and bottom: (4 motifs x 38) = 152 sts worked 1-per-st + 2 corner sc = 154 sc
- Long sides: (10 motifs x 38) = 380 sts worked 1-per-st + 2 corner sc = 382 sc
- Round total: 1,072 sc + 4 corner ch-2 sps
Rnd 2 (trim): Sl st into the corner ch-2 sp. Ch 3 (counts as dc) and work (dc, ch 2, 2 dc) in the same sp. Dc in each sc along the side, and work (2 dc, ch 2, 2 dc) in each corner sp. Join to the top of the ch-3.
- Top and bottom: 154 worked 1-per-st + 4 corner dc = 158 dc
- Long sides: 382 worked 1-per-st + 4 corner dc = 386 dc
Rnd 3 (scallop): Sl st into the corner sp. Ch 1 and work (sc, ch 3, sc) in the corner sp. Along each side, ch 3, sk 1 dc, sc in next dc to the end of the side. Then ch 3 and work (sc, ch 3, sc) in the next corner sp. Join and fasten off.
- Top and bottom: 158 ÷ 2 = 79 repeats, plus the ch-3 before the corner = 80 ch-3 loops
- Long sides: 386 ÷ 2 = 193 repeats, plus the ch-3 before the corner = 194 ch-3 loops
Why the math works: 152 sts ÷ 4.75 sts per in = 32 in (81.3 cm), and 380 ÷ 4.75 = 80 in (203.2 cm). The border sts sit 1-per-st on the joined edge, so the panel isn’t stretched or gathered. Each round adds a fixed number of sts only at the corners. Both 158 and 386 are even, so the 2-st scallop repeat ends exactly at every corner. The three rounds add 1 in (2.5 cm) on every side, bringing the panel to 34 x 82 in (86.4 x 208.3 cm).
Final Blocking
- Weave in all remaining ends along the seams on the WS.
- Soak the panel in cool water with a little wool wash for 15 minutes.
- Press out the water gently by rolling the panel in towels. Don’t wring it.
- Lay it flat on mats, RS up, and pin it to 34 x 82 in (86.4 x 208.3 cm).
- Pin each corner ch-2 sp of the border to a sharp right angle.
- Pin the scallop loops along the bottom edge so they open evenly.
- Nudge each spiral into a flat circle with your fingers.
- Leave it to dry completely, which takes at least 24 hours.
Final Quality-Control Checklist
- [ ] Every motif has 38 sc per side and 4 ch-2 corners
- [ ] All spirals turn the same direction on the RS
- [ ] Each seam has 38 sl sts plus 2 corner sl sts
- [ ] Four-way intersections lie flat with no holes
- [ ] Border Rnd 1 has 154 sc on the short sides and 382 on the long sides
- [ ] Scallops end cleanly at every corner
- [ ] Blocked panel is 34 x 82 in (86.4 x 208.3 cm)
- [ ] All ends are secured on the WS
Troubleshooting
The spiral center cups. You have too few stitches or tight tension. Recount Rnds 2–6, or loosen your dc.
The spiral center ruffles. You have extra increases. Check that each round has exactly 12 increases.
The spiral shows a step. Work the taper (hdc, sc, sl st) without skipping any stitches.
Corners are rounded. Make sure Rnd 9 corners have 2 tr on each side of the ch-5, then block them to a sharp point.
Seams pucker. Your joining is too tight. Use a hook half a size larger.
The panel grows when hung. Cotton stretches under its own weight. Block the panel flat and hang it for 24 hours before deciding whether to adjust it.
The border ripples. You added stitches at the seams. Skip the seam ch-2 sps in Rnd 1.
Care
Hand wash or machine wash on a cold delicate cycle inside a large mesh bag. Lay flat to dry and reshape it to the blocked measurements.
Final Notes
The measurement chain is short and reliable. One 8 in (20.3 cm) motif has 38 sts per side. Four motifs make 32 in (81.3 cm), and ten make 80 in (203.2 cm). The 1 in (2.5 cm) border brings the panel to 34 x 82 in (86.4 x 208.3 cm). Check your first motif, keep your counts exact, and every later stage will fit. Clip 9 rings evenly along the top border, about every 4 in (10.2 cm), and hang the panel.
Happy crocheting!