Batt vs. Rigid-Board Insulation for Vented Attic
I am renovating my grandparent’s house, and one of the next steps is to insulate the ventilated attic.
The house is located in a marine climate, and it was constructed with CMU. The attic slab is made of concrete.
I have seen that the most common practice is to insulate ventilated attics with fluffy stuff (wools), lose or in blankets. So I was wondering why not insulate the attic with rigid boards? And if this is an option, should the boards be mechanically fastened to the slab or lay loose?
In case of going with fluffy stuff, how to prevent damage to the insulation in case of attic acesses ?
Thank you very much in advance
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