For the last few years we have been getting very bad hail storms during the spring. We ended up totaling out the roof on our suburban site and replacing it with a metal roof. Super excited. Since we have decided to keep the suburban site as well as the farm site, we upgraded to metal (cue head banging). Soon we will upgrade our tanks too and be very “clean” water secure. Even though there is quite a bit of air pollution in and near major cities, the personal decision to harvest potential drinking water from a metal roof instead of an asphalt roof just makes sense to us. Plus we not longer have to hassle with the granular pieces that come off the asphalt!