Maxeon Air series of pencil-thin interdigitated back contact (IBC) solar panels weigh only 6 kg per square meter lessening weight load on roofs

https://pv-magazine-usa.com/2021/11/22/as-maxeon-waits-on-potential-u-s-based-solar-cell-fab-it-launches-air-panels-in-europe/

"company selected Europe to launch the panel given the number of low-load commercial and industrial roofs on older buildings throughout the region... adhesive back-contact eliminates the need for racking and other balance-of-system (BOS) components... module can bend and crack without experiencing significant degradation and without creating hotspots"

See also: These light, thin, flexible solar panels ‘peel and stick’ to roofs
https://electrek.co/2021/05/19/these-light-thin-flexible-solar-panels-peel-and-stick-to-roofs/