Hi Everyone, I am quite confused between what the ASHRAE 90.1 and the user?s manual tell us about Building Envelope Mandatory Provisions: *5.4 Mandatory Provisions* *?5.4.1 Insulation.** Where insulation is required in Section* *5.5 or 5.6, it shall comply with the requirements found in Sections* *5.8.1.1 through 5.8.1.9.? - ASHRAE 90.1-2007* * * *Insulation (? 5.8.1)* *?**The first set of mandatory requirements* *addresses the proper installation and* *protection of insulation materials. Issues* *that are covered include compression of* *insulation, installing insulation on sloping* *ceilings and around recessed equipment,* *and protecting insulation from physical or* *moisture damage.?-** ASHRAE 90.1-2007-User?s Manual* * * Does this mean that we could use insulation that is not as efficient as indicated in Table 5.5-1 through 5.5-8 as long as it complies with Section 5.8.1.1 through 5.8.1.9? Your thoughts are highly appreciated.