Oh yeah if you’ve got equipment to cut wood accurately they’re dead easy - I bought the ones in my studio but I’ve seen plans/calcs around for the ‘right’ insulation. Mine are on brackets that stand them off the ceiling, as the air gap increases effectiveness.
I was going to mention restaurants with no treatment - nothing worse than the sound of chairs and cutlery scraping with people getting louder and louder!
If the frame isn't too big it's an easy DIY job. Because the whole thing is covered they can just be butted against each other, then screwed and glued.
Oh yeah if you’ve got equipment to cut wood accurately they’re dead easy - I bought the ones in my studio but I’ve seen plans/calcs around for the ‘right’ insulation. Mine are on brackets that stand them off the ceiling, as the air gap increases effectiveness.
I was going to mention restaurants with no treatment - nothing worse than the sound of chairs and cutlery scraping with people getting louder and louder!