This Thermal Stitch is a variation of the stitch I used in my Extra Thick Potholder. It’s also a Half Double Crochet Thermal but with a slight change which creates a different texture. You can see the lines between the rows are more prominent whereas the Extra Thick Potholder does not have them.
If you already know this stitch and have used it for some of your projects then you know that this is a very dense stitch. It’s commonly used in crochet potholders or washcloths. But it’s also good for anything that will need that extra thickness and sturdiness such as bags or baskets.
If you never tried the Thermal stitch before – there are a few variations of this stitch that I know of. Thermal Single Crochet is the most common, Thermal Half Double Crochet (I have two variations of that stitch) and Thermal Double Crochet.
My personal favourites are the half double crochets but I find the Thermal Single crochet easiest. I recommend starting with the single crochet first just to get to know the stitch.
Thermal Stitches are worked into the stitches of the current row and the row below simultaneously. That’s what creates the thickness. You can use single, double or half double crochets. So in essence, it’s simple but can take some practise to master.
I think there are 3 most important things to remember when working Thermal stitches:
- Find the right first stitch in the previous row.
- Do not skip any stitches (can happen easily)
- The very last stitch likes to hide under the turning chain, so don’t miss it!
Make sure to count your stitches in every row so you catch any mistakes early.
Thermal Stitch Half Double Crochet Potholder Pattern
Want to print or save this pattern in a print-friendly format so you don’t lose it? A PDF version is available on Etsy here. Or scroll down for the free pattern.
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Yarn: any 100% Cotton, 10 ply / Worsted
Hook: 5mm (I’m using this set of hooks)
17cm x 18cm (6.5” x 7”)
15 stitches x 18 rows in Thermal HDC = 4″
Ch = chain
St = stitch
Sl St = slip stitch
HDC = half double crochet
Th HDC = Thermal half double crochet
Ch 26 or until you reach the desired length of your potholder.
Row 1: HDC into the third Ch from hook and across the row (24). Ch 2
Row 2: Do not turn your work at the end of the row as you normally would. Just turn it in a vertical position as pictured below, that way you will see the stitches better.
Yarn over and insert your hook into the back loop only of the first stitch and the unworked two chains stitches below. Yarn over pull through 3 loops on hook, yarn over pull through all loops on hook. Repeat this stitch (Th HDC) in every stitch across the row. Ch 2. (video demonstration available below)
Note: when inserting your hook into the unworked chain stitches – you can work into one chain stitch only or both. I prefer to work into both stitches. Either way is OK.
Row 3: Again, turn your work vertical. Yarn over and insert your hook into the back loop only of the first stitch and the unworked loop from the row below. Yarn over pull through 2 loops on hook, yarn over pull through all loops on hook. Repeat Th HDC stitches in every stitch across the row (24). Ch 2.
Repeat row 3 until you reach 7” or your desired size.
Note: I have switched to a different cotton yarn (also 100% cotton and similar weight) half way through. If you don’t know how to switch yarn I have a video demonstration of that in my Crochet Thermal Stripes Potholder here.
LOOP: Ch 15 for the loop and continue to last row.
LAST ROW: Insert your hook under both loops (front and back loops, see picture below) and into the unworked loop from row below. Slip stitch through all the loops. You can watch the video below for more clarification.
Fasten off and weave in all ends.