Norm spoke at the Guelph Organic Conference January 31, 2015 on Greenhouses 101: Knowing the basics before you buy-Choices and Consquences
You can find the articles and information posted, as well as a video of his presentation and the Q&A below.
Norm did a presentation at the Guelph Organic Conference on Greenhouses 202: Making sure your structure survives the elements. The presentation is broken into three parts for easy viewing, the last section of which is the Q&A. These tips apply for greenhouses, storage buildings, livestock shelters, really anything we sell. Key Points Covered in the presentation:
1. Some basic principles of engineering so that the forces exerted on the buildings could be better understood.
2. The many components of anchoring. Anchoring prevents a structure from settling under snow load, prevents lifting under aerodynamic forces and prevents shifting with wind forces.
3. The similarities of an airplane wing to the shape of a structure. What happens when surfaces become bigger, wider. lower and higher.
4. How uneven loads can happen and how to prevent them.
5. The proper procedure to removing excessive snow load
We offer two main types of anchoring for our structures: Base Brackets (left pic) and Anchor Posts (right pic).
Which one you decide to go with largely depends on your application and location. They are not to be used together, it is a one or the other option. No matter which option you choose, please be aware, there is no such thing as too many anchors!
Although the building can be anchored directly into the ground with Anchor Posts, it can also sit on a slab, curb or beam or it can be elevated on some sort of a wall. Base brackets with lag bolts are supplied standard to fasten the building to the chosen form of foundation. Anchor Postsare available at an additional cost.
Anchor Posts must be set into concrete when:
the soil has been recently excavated (within the last 5 years)
it is required by the building code (use of concrete usually classifies the building as permanent)
extremely windy and exposed areas exist (at least use on the corner posts)
more than 10% of the anchor post will be out of the ground (upgrading anchor post size may be needed)
there are areas where erosion has been a problem in the past
Anchor Posts SHOULD NOT be used (and base brackets used instead) when:
the soil is a very heavy clay (heaving would be a constant problem)
there is a shallow rock layer
there are major amounts of rocks interfering with the accuracy of anchor post setting
the structure will be moved shortly (anchor posts must be cleaned out before reusing)
**Recommendations are based on years of experience. Ultimately the customer is responsible to properly anchor a structure**
Please see our installation pages for a more detailed breakdown of this topic Base Brackets vs Anchor Posts