IMPORTANT wind braces are the longer pipes, purlins are the shorter ones, Cross ties are optional, and they are the longest pipes you will get (pictured below, not here)
How to install windbraces video is on our YouTube Channel
Below are examples of structures with cross-ties, bars going across the peak for larger structures. These are optional to reinforce the structure. Please see the supplemental Cross-Ties page in the installation guide as well as additional notes below the photos
We’ve had a number of questions regarding cross ties being missing from orders. This isn’t the case, and is done on purpose because the last cross tie interferes with the end cover, so we ship the orders “short” on cross ties to compensate for this. We are sorry for any confusion this has caused and are happy to help you with any other installation questions you may have.
Cross ties, also known as collar ties, are a horizontal bar in a structure which ties the left and right side together. They are usually 3’ to 4’ down from the peak. The purpose of cross ties is to add load strength to the structure. Many people look at cross ties as a nuisance because of lost head space but they have a three fold benefit.
By forming the triangle at the peak you create benefit for the dead load which is usually snow load. The top can not come down when the sides can not spread.
By tying the left and right sides together, you create strength for the live load, commonly referred to as wind load. When the wind blows from the left, the right side holds it from pushing inward and vice versa.
Most importantly, it decreases the rocking motion which can stress a building over time.
The cross tie can also supply a very useful support area for things that need to be suspended.
It is important to remember that when you spread out the load you create strength.Photos & Video: Purlins, Windbraces & Crossties
The main function of anchors is to prevent uplift. Do not forget about the “foundation function” as well which is meant to prevent settling or lateral shifting.
Improperly anchoring a building from up lift, down force and lateral movement will all, equally, cause problems and expense.
There are many different ways of anchoring a building because there are so many circumstances which people are dealing with.
When anchors can be installed at opposing angles, they work against each other and therefore will multiply their holding power.
Care must be taken to stay away from anchors that will bend (i.e. re-bar).
When the anchors are going straight into the ground, care must be taken to ensure proper holding power. This is most often done with plugs of concrete.
When anchors have been extended out of the ground, care must be exercised to eliminate the possibility of outward lean.
It is important to consider the total amount of square inches of contact area between anchors and soil. Many time fewer big anchors is less holding power.
One thing which simply can not be stressed enough is that there simply is no such thing as too many anchors. Anchors are generally very inexpensive, especially when you are looking with hind site at some damage.
For more details and to watch an illustration, please see our YouTube Video below