Previously the NGMA provided a document that outlined
structural design loads for greenhouses. The document contained some
different loading requirements that were specific to greenhouses.
Unfortunately this document was based on code books that are no longer
current or in use. Since greenhouse construction is generally governed
by the International Building Code it was decided to remove this
outdated code document.
The NGMA Structural Committee recommends the Structural Design Manual
for greenhouses as your reference. This document is also available for
download on the website. It references specific greenhouse design
requirements and considerations as well as the recommendation of using
the latest edition of the International Building Code and ASCE 7 for the
environmental loads to be used in the greenhouse structural design.