There are several explanations as to why warehouse clubs charge membership fees and. how the fees play a role in the competitive landscape of the retail grocery market. We provide. another insight into the nature of the membership fee using a model of price competition. between a warehouse club and a supermarket.
A prescriptive ignition barrier is required within a residential application over the surface of the polyurethane foam insulation when used within accessible attics or crawlspaces. Interior surfaces in inhabited buildings should be covered with a 15 minute thermal barrier for fire protection.
Apply any of these materials over the foam in areas where an ignition barrier is required, and youâve met code. Intumescent coatings and bare foam. These sorts of barrier materials take time and effort to applyâespecially when youâre lying on your side in a low crawlspace or sealed attic.