How to Nest Seams (Step by Step)

Nesting seams is the difference between points that match up and points that make you sigh. It's a small technique that does a lot of heavy lifting, especially in a design built from a checkerboard or plaid grid like this one.

Step 1: Press your rows or segments before you join them. Before any two pieces meet, each seam inside them needs to already be pressed in a clear direction, one row leaning left, the next leaning right. You can see it in the stacked segments here, each with its seams pressed flat and consistent.

Step 2: Lay your two pieces right sides together and find the seam intersections. This is the moment nesting actually happens. Where two seams are about to cross, they should fold in opposite directions so they lock into each other rather than stacking in one thick lump. You can see it happening at the corner here, seams folding one over the other.

Step 3: Feel for the click. Run your fingers along the seam allowance at each intersection until you feel the two seams lock into place, one folding one way, one folding the other. This is easier to feel than to see, so trust your fingers here more than your eyes.

Step 4: Pin or clip through the intersection to hold it in place. Pins work, and clips work too, especially with several layers meeting at once. Whichever you use, secure the exact point where the seams cross so nothing shifts before you sew. You can see both methods side by side here.

Step 5: Sew slowly through each intersection. Speed is not your friend here. Go slow enough that the nested seams stay locked together as the needle passes through, rather than letting one side slip ahead of the other.

Step 6: Press your seams open with a clapper for the flattest result. Once your seams are sewn, a wooden clapper set on top of a freshly pressed seam while it's still warm helps flatten it fast and holds that flatness as the fabric cools. You can see the clapper doing exactly that here, pressed right over the strip set.

Step 7: Check your grid for clean, matching intersections. Once a block of nested seams is sewn and pressed, lay it out and look at where all the seams cross. In a checkerboard or plaid pattern like this, every intersection should line up into a tidy grid, not stagger off to one side.

Step 8: Fan out a stitched section to double check your seam allowances stayed consistent. Holding a few finished rows up and fanning them slightly, like shown here, lets you see whether your seams are landing at the same depth all the way across. Any row that looks noticeably thinner or thicker than the rest is worth a second look.

Step 9: Compare your work against the full assembled piece. Once everything is sewn and pressed, the whole design should read as a clean, even grid with sharp intersections throughout, like the finished piece shown here.

Common errors and how to fix them:

Your seams stack instead of nest. This usually means both seams got pressed in the same direction instead of opposite ones. Go back and check your pressing direction on each row before you join them.

Your points shift while sewing. The nested seams likely weren't pinned or clipped securely enough at the intersection, and one side slipped as it fed through the machine. Secure directly through the crossing point next time, not just nearby.

Your intersections look bulky or don't lie flat. Pressing to the side on every seam in a busy pattern can build up thickness fast. Consider pressing some seams open instead, especially where several seams converge in one spot, and use a clapper to flatten them while warm.

Your finished grid looks uneven, with some intersections offset from others. This traces back to inconsistent seam allowances somewhere in the piecing. Recheck your seam test from earlier in this series, since a small drift there shows up clearly once everything comes together.