How to Block: Instructions for Spray Blocking Crochet Squares

How to Spray Block Crochet Squares: Free Tutorial

I’ve fielded lots of questions about blocking crochet and knitting recently, and I thought a wee tutorial might be in order. So I spent this afternoon up in the mountains recovering from the last few months, and in so doing I blocked some squares. Here’s the long and short of it; click any photo for more information, or check out the full photo tutorial on Flickr (there are about twice as many photos there*).

Crochet blocking is the process of setting your fiber pieces with some form of water. You can spray block (demonstrated here), wet block (using a similar technique but starting by submerging your pieces in water until they’re saturated), or steam block (using a steamer or a steam iron after you pin the dry pieces). Blocking almost always works magic on natural fibers and blends. Results are less predictable with synthetics. There are several benefits to blocking:

  • Blocking sets the shape of your pieces (e.g., you can even out edges or help correct unwanted curling).
  • Blocking relaxes and evens out your stitches.
  • Blocking can dramatically improve the drape of your fabric.
  • You can slightly adjust the finished size of your fabric by blocking it. (You can block it to be bigger, but not to be smaller.)

Gather the following before you begin:

  • Completed pieces of crochet or knitting
  • A flat surface (like a blocking board [used here], bed, carpet, or stack of towels)
  • Rustproof pins
  • Spray bottle filled with tepid water

Stacks of Squares

1. Note the finished dimensions of the squares (if you’re blocking a garment, use the measurements in the schematic drawing as a guide; from here on I’m only going to refer to squares). In this example I’m blocking both standard 7-round granny squares (pictured on the right) and several different-size squares for my Babette Blanket. The standard grannies need to be 7.5″ square, and the largest-to-smallest Babette squares need to be 15″, 5″, and 2.5″ square, respectively.

2. Leaving breathing room between them, lay your squares out on a flat surface. In this example I’m using a blocking board**, which is already (after this one use) my new best friend. You could also use a mattress (I would remove blankets first), a clean carpet, or a stack of towels. The bonus of using a blocking board is the super handy grid printed on the fabric lining (also, the lining wicks moisture to speed drying). You could make yourself a blocking board using foam board and fabric, too.

Lay Out Your Pieces

[Bonus photos of Babette squares laid out, and of the tremendous capacity of the blocking board.]

3. Grab some pins (but not really; you’d stick yourself). Pin the first corner of the square; any corner will do. If you’re using a grid, make sure to position the square on the grid so that it’s easy to measure in both directions so you can determine where to pin the other corners.

Pin the First Corner

4. Pin the corner diagonally opposed to the first corner. Continue to pin the remaining two corners. Measure to make sure the pins are equidistant from each other along the edges. In this example, each edge is now 7.5″ across. I had to stretch the edges slightly to achieve this.

Pin the Other Corners

5. Notice in the previous photo that pinning the corners caused the edges to curve. Correct this by pinning the center of each edge to the proper dimension. Continue pinning until the edges are flat and square.

Finish Pinning

6. Spray the pieces evenly and thoroughly with tepid water. (This is why you should use rustproof pins.)

Spray the Pieces

7. Leave the pieces pinned until they’re completely dry. Depending on your climate and the time of day, you might have to leave them overnight. Here are the Babette squares just after spraying:

Leave To Dry

8. Once dry, remove the pins and enjoy your work.


* There are 19 photos in the Flickr set. I took 173 during the shoot.
** I got my board at Three Bags Full in Vancouver, BC. Lots of local yarn stores carry them, as do some online stores.

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