Double Crochet Thermal Stitch or Half Double Crochet Thermal Stitch are exactly the same as (single crochet) Thermal Stitch, except worked with dc or hdc respectively.
I have a fully detailed written and pictorial guide on how to do the default (single crochet) Thermal Stitch.
I originally called it the Strap Stitch because I “invented” it while trying to make a sturdy strap. I suspected but didn’t know then that such a stitch already existed. Now it is just too much work to try and change all my earlier references.
Here, I am sharing a video tutorial (by someone else) towards the end of the page.
dc vs hdc Thermal Stitch
In the video, he only talks about the dc thermal stitch. But the hdc can also be used in the Thermal Stitch method. In fact, I prefer the hdc Thermal St.
dc vs hdc thermal stitch
The hdc Thermal St is:
- of course, shorter
- feels firmer and sturdier
As I detailed in the Strap Stitch/Thermal Stitch (sc) tutorial, the trick to getting straight edges is:
skip first stitch, add one st at the end
I would recommend you read through the basic (sc) Thermal Stitch tutorial first. That should give you a much clearer idea of what is going on when you watch the video below on how to crochet the dc Thermal Stitch.
How to Crochet the Double Crochet Thermal Stitch