A building construction assembly for installation on a roof deck including a base layer and a channel structure coupled to the base layer and defining a plurality of channels. In an embodiment, the plurality of channels include a first airflow channel and second airflow channel extending in parallel through the channel structure. The plurality of channels further includes a venting channel between the first and second airflow channels and the base layer. The channel structure defines one or more apertures between the venting channel and each of the first and second airflow channels configured to allow airflow from the first and second airflow channels into the venting channel. The base layer defines one or more exit orifices in airflow communication with the venting channel and configured such that air in the venting channel exits the building construction assembly through the one or more exit orifices.