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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

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.

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1. A building construction assembly for installation on a roof deck, the building construction assembly comprising: a base layer; anda channel structure coupled to the base layer and defining a plurality of channels, the plurality of channels including a first airflow channel and second airflow chan

1. A building construction assembly for installation on a roof deck, the building construction assembly comprising: a base layer; anda channel structure coupled to the base layer and defining a plurality of channels, the plurality of channels including a first airflow channel and second airflow channel extending in parallel through the channel structure, the plurality of channels further including a venting channel between the first and second airflow channels and the base layer, the channel structure defining 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, wherein 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;wherein the channel structure defines one or more roof ventilation orifices on a side of the channel structure opposite base layer, the one or more roof ventilation orifices each configured for airflow communication with an unconditioned space below the roof deck. 2. The building construction assembly of claim 1, and further comprising one or more exit channels each in airflow communication with one of the one or more exit orifices. 3. The building construction assembly of claim 2, and further comprising a shingle assembly disposed on the base layer on a side opposite the channel assembly, the shingle assembly defining the one or more exit channels. 4. The building construction assembly of claim 1, and further comprising: a radiant barrier film on one or more surfaces of the channel structure. 5. The building construction assembly of claim 1, wherein the building construction assembly is fastenable to the roof deck with a plurality of fasteners extending through at least a portion of the channel structure and into the roof deck. 6. The building construction assembly of claim 1, wherein the building construction assembly is fastenable to the roof deck with an expandable adhesive. 7. The building construction assembly of claim 6, wherein one or more additional layers are fastenable to the base layer on a side opposite the channel structure via fasteners extending through the additional layers and building construction assembly and into the expandable adhesive. 8. The building construction assembly of claim 1, wherein the building construction assembly has a weight of between about 0.50 lbs/ft2 and about 1.25 lbs/ft2. 9. The building construction assembly of claim 1, wherein the building construction assembly has a short-term structural load capacity of at least 200 pounds per 4 inch by 4 inch area. 10. The building construction assembly of claim 1, wherein the building construction assembly is transportable in roll form. 11. The building construction assembly of claim 1, wherein the channel structure further includes materials selected from the group consisting of intumescent materials and phase change materials (PCMs). 12. The building construction assembly of claim 1, wherein the channel structure further includes one or more structural channels above the first and second airflow channels and adjacent the venting channel. 13. The building construction assembly of claim 12, further comprising a structural material having cavities and positioned in the one or more structural channels, wherein one or more materials selected from the group consisting of intumescent materials, PCMs, or thermal management materials are positioned in the cavities of the structural material. 14. A system for a roof, the system comprising: a plurality of building construction assemblies, each building construction assembly comprising: a base layer; anda channel structure coupled to the base layer and defining a plurality of channels, the plurality of channels including a first airflow channel and second airflow channel extending in parallel through the channel structure, the plurality of channels further including a venting channel between the first and second airflow channels and the base layer, the channel structure defining 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, wherein 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,wherein the plurality of building construction assemblies are adjacently arranged on a roof deck such that the plurality of channels in the adjacently arranged building construction assemblies extend from a soffit region of the roof to a peak of the roof; andwherein the channel structure of each building construction assembly defines one or more roof ventilation orifices on a side of the channel structure opposite base layer, the one or more roof ventilation orifices each configured for airflow communication with an unconditioned space below the roof deck. 15. The system of claim 14, and further comprising one or more exit channels each in airflow communication with one of the one or more exit orifices. 16. The system of claim 15, and further comprising: a shingle assembly disposed on the base layer on a side opposite the channel assembly, the shingle assembly defining the one or more exit channels. 17. The system of claim 14, and further comprising: a radiant barrier film on one or more surfaces of the channel structure of each of the building construction assemblies. 18. The system of claim 14, wherein each building construction assembly is fastenable to the roof deck with a plurality of fasteners extending through at least a portion of the channel structure and into the roof deck. 19. The system of claim 14, wherein each building construction assembly is fastenable to the roof deck with an expandable adhesive. 20. The system of claim 19, wherein one or more additional layers are fastenable to the base layer of each building construction assembly on a side opposite the channel structure via fasteners extending through the additional layers and building construction assembly and into the expandable adhesive. 21. The system of claim 14, and further comprising: shingles coupled to the base layer of each building construction assembly on a side opposite the channel structure. 22. The system of claim 14, and further comprising: a collection manifold in airflow communication with the plurality of channels for solar harvesting of low grade heat. 23. The system of claim 22, and further comprising: a solar thermal unit for storage or transfer of the low grade heat. 24. A building construction assembly for installation on a roof deck, the building construction assembly comprising: a base layer; anda channel structure coupled to the base layer and defining a plurality of channels, the plurality of channels including a first airflow channel and second airflow channel extending in parallel through the channel structure, the plurality of channels further including a venting channel between the first and second airflow channels and the base layer, the channel structure defining 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, wherein 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, wherein the channel structure further includes one or more structural channels above the first and second airflow channels and adjacent the venting channel; anda structural material having cavities and positioned in the one or more structural channels, wherein one or more materials selected from the group consisting of intumescent materials, PCMs, or thermal management materials are positioned in the cavities of the structural material.