Return to Installation
Return to Forum
Ok so I have read pros and cons of standing seam versus spaced fasteners.
The general consensus is that a quality installation is most important. However, it is well understood that expansion and contraction of metal will cause the holes where screws were installed get opened up by expansion forces requiring maintenance in the future
Now, if the home is to be built in the Florida panhandle gulf coast region subject to more tropical storms and potential high winds, does the potential added number of fasteners and closer spacing have any impact on the decision which method of installation might be used? Certainly the increased number/spacing of conventional fasteners might be stronger in structural integrity?
Thanks. By structural integrity, I assume you mean wind resistance. Each product you consider should have uplift test results you can view upon request. I would go back again to proper installation though ... and the fact that sometimes products have been tested with one set of installation procedures but actually installed in the field differently.
Through fastened products will perform very well in wind uplift tests when they are installed. Unlike other products, there are no interlocks between panels -- interlocks that typically will eventually fail when subjected to high enough pressures.
However, as the product ages and the fastener holes elongate from expansion and contraction and the fasteners themselves even loosen a bit ... that is when those products can start to lose their uplift resistance; concealed fastened products do not have the same problem. Unfortunately, though, I am unaware of any uplift testing ever being done on aged systems.
+1 to Todd's comments.
There are plenty of concealed fastener systems that will have as good, if not better wind lift ratings as exposed fasteners.
I have a contractor agreement for a complete metal roof on my house in Key West, FL. He didn’t list the type of preparation or materials for that or the type of metal that will be used. Although he will have to follow the FL codes I am worried that he may try to skimp on cost and go as cheap as he can. Will code required materials keep that from happening? Also, the current roof has two layers of old shingles and may have some rotted wood under them. Will he have to remove them and replace any bad wood? Does the Florida code require this on a roofing replacement?
Clark, ultimately a full range of metal products have Florida and Dade County product approval and NOA. So, no, code does not protect you from an "entry level" product versus an investment grade product. The contractor really needs to identify the product and give you a copy both of the product warranty and their installation warranty. I am not certain of this but, in order to get the job permitted, I believe he will have to remove the old shingles and check the decking.
If you would like to reply to this thread, please
If you do not have an Ask the Experts forum user account,