I have the same thing going right now as I have creeping fig (Ficus pumilla) on one side of the house, up to and covering the fascia, and I'm having a new roof put on. Mine was slow to get going but over the last few years I've had to keep cutting it back as it wants to grow over the roof, and when I cut it back I cut. back approx 5-6' and it regrows very quickly. So I just told the roofers to chop away! Now that yours has an established root system it might well regrow more quickly than it did the first time.

This article says that the fumigant doesn't harm plant roots but can burn foliage that it comes in contact with. Your plant is outside the house; the fumigant is going to be released inside the house. The tent is to minimize leakage into the surrounding air. My guess is that you might see some minor burning on the leaves, but that the plant should be ok. Make sure to water it before tenting so that it isn't stressed and so that the water acts as a barrier to the roots. If you have windows on that wall you might want to seal them before the house is tented.

https://www.latimes.com/archives/la-xpm-1998-jun-07-re-57407-story.html

Duplicate post: https://www.gardenweb.com/discussions/5934972/creeping-fig-and-termite-tenting#n=1