Recently, model building codes have enacted restrictions regarding the use of aggregate as a top surfacing for low-slope membrane roof assemblies. Such restrictions may affect the installation of low-slope membrane roof assemblies.
Following is the rationale for these restrictions and a review of the specific restrictions.
Since the early 1990s, model building codes have taken strides to strengthen buildings' resistances to high-wind pressures, such as those experienced during hurricanes. At the same time, insurance industry representatives and some wind experts also have lobbied for code restrictions intended to limit wind-borne debris during high-wind events.