As a general rule, material costs to use Helix is around 5 to 6 times more expensive than using screws when one layer of insulation is installed. Unlike mechanically fastening insulation where only the top layer is fastened, each individual layer must be adhered when using Helix Low-Rise Adhesive. However, some of the major benefits to using Helix Low-Rise Adhesive can greatly decrease costs in other areas of the project, such as: • Reduced labor compared to standard fastening into concrete, gypsum, cementitious wood fiber (Tectum), and lightweight concrete roof decks