physicist Disguised Kilimanjaro 15 or 30 lb felt for roofing photography time table shade
What is the difference between 15 pound roofing felt and 30 pound felt?
J Quintero Roofing - When should I use 30lb felt? Most standard pitched roofs only need a 15lb. felt for proper underlayment. 30lb. is used for many specialty applications such as: low
Roofing Underlayment Types - InterNACHI®
Mastering Roof Inspections: Underlayment, Part 2 - InterNACHI®