compressing glasswool insulation

I am planning to build a garden pod for my office in the backyard. We live in a mild climate where temperatures do not drop below 0°C for more than a couple of hours, a few times a year, and rarely exceed 30°C in the summer.

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My budget is quite restrictive, which means I will likely need to avoid high R-value insulation. If the budget allows, I plan to use foil paper to wrap the structure.

My question is: Can I use acoustic insulation with an R-value of around 1.2 and double it up? I can purchase enough insulation to cover the entire office for just $26, while the nearest alternative would cost over $300. The cavity is 90 mm thick, and the insulation is 50 mm, allowing me to almost fit two pieces without compression.

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I have read online that compressing insulation lowers the R-value, but this is often due to voids within the material. Therefore, if the cavity is completely filled, could that mean I would achieve an R-value of 2.4 or more?

UPDATE: I am located in Australia, where we use SI R-value measurements. A SI R-value of 2.4R is approximately equivalent to 13.5R in the US.

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