I recently built an addition that has cathedral ceilings. I used 2 x 10 rafters. Do I really need to install the plastic or foam ventilation channels in each rafter??? If I use insulation that is only 6 inches thick then it will leave a greater space for ventilation that the plastic channels will leave. Is there another purpose that is important??? Any advise will be helpful. I estimated that cost for the channels at approximately $500.00 - is it worth this???
Thanks in advance!!
Thanks in advance!!