[RE-wrenches] Attaching to roof sheeting

[Jason Szumlanski]

There are products for connection to sheathing/decking only. It might not
answer your question directly, but...

Check out the Eco-Fasten Eco-44/65. It was designed for SIP panels and
low-slope membrane roofs. We have fastened these to wood and steel decking
only. They have 6 or 8 holes for fasteners. If flashed properly, it's a
plausible option on composite roofs even through the manufacturer does not
market it for that use. There is plenty of data out there for screw
pull-out strength in OSB and plywood from fastener manufacturers. Maybe
Eco-Fasten can point you to the right fastener type recommended (required?)
for their product in a variety of substrates.

Another good example is the VersaBracket from S-5!. On a 5V metal roof with
vertical trusses there is no way to hit trusses that land under the V
crimps, so blocking would be necessary for other methods (like the
EcoFasten SimpleSeal). If you can't access the attic, you are out of luck
for blocking, so the Versabracket is an option we have used, even in the
high velocity hurricane zones in Florida. S-5! even publishes load test
data in 1/2" OSB for Versabrackets using the fastener (14 x 1.5" TYPE 17
w/washer 3/8" HWH). The Versabracket-67 has an allowable load normal to the
deck of 181 pounds. That usually requires 12"-32" spacing depending on roof
zone around here. It's a lot of brackets, but they are pretty cheap.

For tile roofs, tile hooks usually allow an easy way to find a truss, but
if the trusses go the wrong way, blocking is the only option I am aware of.

Comp roofs - I can't imagine why it couldn't be done from an engineering
standpoint, but the flashing is the more difficult question in my mind.


Jason Szumlanski
Florida Solar Design Group



On Tue, Apr 28, 2015 at 4:50 PM, <william at millersolar.com> wrote:

> Friends:
>
>
>
> I’d like to bring up the subject of fastening roof mounts directly to roof
> sheeting.  We have occasionally a need to do a roof mount on tile or comp
> roofs where we cannot guarantee finding rafters in a useable locations.  We
> researched this in 2013.
>
>
>
> We discovered the DPW EZ feet product.  When we researched further, the
> manufacturer of the screws being used told us that the screw had not been
> tested with standard roof sheeting materials.  The need has occurred again
> and we want to renew our search for options.
>
>
>
> Are there any direct-to-sheeting attachment options that have been
> certified for suitability in North America?
>
>
>
> Thanks in advance.
>
>
>
> William Miller
>
>
>
>
>
> [image: Gradient Cap_mini]
> Lic 773985
> millersolar.com <http://www.millersolar.com/>
> 805-438-5600
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150429/23e30611/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.jpg
Type: image/jpeg
Size: 1460 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150429/23e30611/attachment-0005.jpg>