Cardboard in polytunnel?

We bought a polytunnel! Yay, yay and yay! It's about 10'by 20' (3x6 meters).

The area where we will put it is covered with grass and weeds. I was wondering whether I could make the beds by putting cardboard on the ground and covering it with compost. Would the cardboard decompose as easily as it would outside? I suppose it would get wet because the plants obviously need water.

Have you had any experiences doing this?

I used newspaper and grass clippings in a pollytunnel and it worked fine, it's probably a little bit slower to rot as it's not as wet, but equally it doesn't blow away like outside either!

It should work more or less the same. I know a couple veggie farmers who use black plastic to solarize the grass to death inside a new tunnel. It might be a little late for that this year though. Although maybe not

Cardboard will certainly work under you growing area to suppress the weeds, but the area you walk around in? Maybe not so much. I tend to cover the whole area with woven weed fabric, then place raised beds around where I need them. Check out the pics. The heavy woven landscape fabric will last for years even in the walking area.
You can see what I mean in this post also https://planterspost.com/growing-tomatoes-in-pots/

Thanks everyone! I'll just give it a go then. I don't mind weeds so much where I'm walking :-)

I used cardboard and brown paper covered with straw last year in my poly tunnel.  Worked great. Was all gone by fall.