I am frequently asked this question by readers of my book, The Art of Tapestry Weaving, and by students in my online classes. The best way to really know how tight the warp should be is to feel the warps of experienced tapestry weavers. But if you aren’t able to come to an in-person workshop or retreat any time soon, the video and discussion below will help you figure out what the right warp tension is for you.
When I got my first Mirrix loom I was thrilled with how tight I could make the tension. The looms come with a little wrench that you can use to tighten the wing nuts beyond what you can do with just your hands. I use a cotton seine twine warp which is very strong and can take a huge amount of tension. So I’d tighten that Mirrix warp very very tight. It was far tighter than I can get the tension on my beefy rug loom.