compressing glasswool insulation

I am planning to build a 'garden pod' for my office in the back yard. we live in a mild climate, it does not go below 0°C for more than a couple of hours a couple of times a year and rarely breaks 30°C in summer.

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I will be on a fairly restrictive budget that will mean I will probably have to avoid all of the high R value insulation. I will be using foil paper to wrap the structure if the budget allows.

My question is, Could I use acoustic insulation with an R value of around 1.2, but double it up? I can get enough to do the whole office for $26 (the closest alternative would be $300+) the cavity will be 90mm thick and the insulation is 50mm, so I could almost fit 2 in without compression.

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I have read online, that if you compress it that the R value goes down, but also that that's because of voids, so if the cavity is completely full, would that mean I would be getting an R value of 2.4+?

UPDATE I am located in Australia, we use SI R value measurements, SI 2.4R is around 13.5R US value.

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