[RE-wrenches] Goofy roofing

Tue May 3 06:43:04 PDT 2016

Bill –

So it sounds like you have a corrugated metal roof installed by a handyman
over an existing comp shingle roof? It might be wise to get your building
department planchecker or inspector involved at this point since it sounds
like you have a potential code violation. Adding PV to an already shotty
roof setup will just compound problems down the line. That said, if you
can’t trust the purlins (or what I think you are referring to as 1” x 4”
stringers) to be structural members, then I suppose you could install long
hanger bolts all the way through the metal roof and into the  rafters? You
could use a double jam-nut setup to mount your racking. Just an idea, but
it is not an ideal situation.

Good luck out there!

Best, August

*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *frenergy
*Sent:* Saturday, April 30, 2016 7:47 AM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] Goofy roofing

Benn, August, etc

        Sorry for omitting a somewhat crucial detail....below these
stringers it is a "standard" residential stacked roof with 2X6 rafters on
16" centers with 1/2 " plywood deck. No purlins.  I appreciate the
feedback/good ideas.

Bill

Feather River Solar Electric

On 4/29/2016 3:28 PM, August Goers wrote:

Benn,

We’ve done it several ways including putting four 14 x 1.5” TYPE 17 screws
per attachment point through the metal and into the 1” x wood purlin. The
key is that the load path all the way down needs to be capable of handling
the worst case loads. So we had to check that too. Some racking
manufactures such as Unirac have online calculators to give point loads.

Best, August

*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *Benn Kilburn
*Sent:* Friday, April 29, 2016 2:17 PM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] Goofy roofing

August, et al;

If the purlins are only 1"x4" or 1"x6" or....1"x anything, are you only
relying on the 1" purlin as the attachment point or are you hitting the
vertical trusses below the purlins?

We are working on a corrugated roof right now and using a Schletter roof
bracket. The name of it escapes me at the moment. Maybe FixT?

We are attaching to purlins which are 2"x6".  I wouldn't think 1"x anything
would provide enough pull-out?

Benn Kilburn

SkyFire Energy Inc.

780-906-7807

On Apr 29, 2016, at 9:09 AM, August Goers <august at luminalt.com> wrote:

Hi Bill,

It sounds like you’re talking about a purlin type setup – 4’ sounds a
little far apart but I guess that’s what you have to deal with. If you have
a corrugated metal roof, we’ve used S-5 CurruBrackets screwed through the
metal and into the purlins and then either run the solar rail up and down
the roof or install a sub-rack system (with strut or angle aluminum)
perpendicular to your solar rail.

Best,

August

*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *frenergy
*Sent:* Friday, April 29, 2016 6:55 AM
*To:* RE-wrenches
*Subject:* [RE-wrenches] Goofy roofing

Recently, a customer had a metal roof (not standing seam) installed by a
"handyman".  Pretty clean installation however for some reason he ran 1X6
stringers across the roof  on the 1/2" plywood deck spaced about every 4
feet (as you go from ridge to eaves).  Of course the roofing screws are at
the stringers.  I'm sure he had a *great* reason for doing so.  So now I
have been asked to install an array on this roof.  You can feel how "soft"
the roof is as you walk on it of course because you are walking on
air-below-metal for most of the roof.  Stringer locations don't jive with
possible feet/post locations for rail.  I'm usually pretty good at problem
solving but I'm accepting ideas.

Bill

Feather River Solar Electric

Bill Battagin, Owner

4291 Nelson St.

Taylorsville, CA 95983

530.284.7849

CA Lic 874049

www.frenergy.net

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Feather River Solar Electric

Bill Battagin, Owner

4291 Nelson St.

Taylorsville, CA 95983

530.284.7849

CA Lic 874049

www.frenergy.net
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