Italian to English Other Construction / Civil Engineering Calate?

Hello,

A client of mine just asked me to translate for him an estimate from Italian to English. I am finding it difficult to translate the sentence **"calate foderate con increspatore a calici"**.
I thought "calate" is the same of "tende", but in this estimate, a clear distinction is made between the two, without explaining why. I don't have much context, being a list. Moreover, I never heard of "increspatore". I thought it might be a typo, but it is repeated more than once in the text.

I could not find anything online, any suggestions?

Thank you in advance for your time!