According to the Keystone website: Springdale: ēR-7 Insulation-Roof, Walls, ēR-20 Floor (Arctic Package Only)
Compared to the Sprinter: (R30) floor; (R28) roof; (R18) slideout floor; (R20) front wall
Compared to the Montana: (R-38 Equivalent) Radiant technology insulated roof, (R-11) Insulated sidewalls, (R-21) Insulated main floor
You can't compare noise reduction with insulation from heat and cold.
The Springdale is one of the "least insulated" trailers in the Keystone line.
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS