When you create a webform you can limit the access to specific roles only in the form settings. By default, only the access to the webform is checked. The node the webform is attached to will always be visible.
This module ensures that the node the webform is attached to will inherit the access restriction set to the webform and access to the node itself is also denied if you view the node with a role that should not have access.
Development of this module is sponsored by LimoenGroen, Amsterdam-based Drupal specialists.