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Old 02-01-2013, 12:37 PM   #1
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Existing Roofing 13' span. 2x6 w/ 48 oc spacing


I live in hawaii, i bought a older house with a cottage *that has a carport, that I screened in, years ago. The original roof was aluminum. The rafters are 2x 6 *- 48 " oc .
The room is 12.5 ' wide , the rafter looks like it sits on a ledger board and slopes down to a beam. The whole rafter is 15' long with a 2' outside Overhang.

This year a roofing contractor replaced the metal roof with *battens, plywood and composite *roll roofing (for low sloping)

I noticed a middle rafter has two - cracks that split perpendicular from the bottom up about 4.5' apart in the center of the rafter. *The cracks are nearly half way thru.*
My roof contractor mentioned sistering a rafter to just this one. Another one mentioned nailing? I'm wondering even if that will be enough? I am having solar
Panels installed on that Entire roof, next week.*

Should I call my insurance company? I'm at a loss on what to do?*

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Old 02-01-2013, 12:52 PM   #2
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Existing Roofing 13' span. 2x6 w/ 48 oc spacing


Those are rather light weight for carrying a load---Your insurance company will not be likely to help--do call a carpenter---get those doubled (sistered) before the solar panels are installed.

Your panel company might have a carpenter that they could recommend.

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Old 02-01-2013, 01:27 PM   #3
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Existing Roofing 13' span. 2x6 w/ 48 oc spacing


What should have been done is add rafters between every one that was already there.
That spacing is double what it needs to be.
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Old 02-01-2013, 02:01 PM   #4
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Existing Roofing 13' span. 2x6 w/ 48 oc spacing


your span, and spacing are ludicrous with a 2 x 6 if you expect a bird to land on your roof. Cancel the solar guys (I would not let them come anywhere near my house if they were going to put panels on this structure, especially if we are talking hot water. Water is heavy.)

Go online and google span ratings for rafters. I would not use less than
2 x 10's 24 inches on center at that span. Even in Paradise.
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Last edited by jagans; 02-01-2013 at 02:03 PM.
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Old 02-01-2013, 04:24 PM   #5
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Existing Roofing 13' span. 2x6 w/ 48 oc spacing


Thank you for you input,
My roof contractor is on his way over, a bit nervous. Thinking now- he should have put addition 2x6 between the existing rafters while he had the roof off!

Now that the roof is on - you mentioned sistering? On to a 2x6 both sides- what would you use to = the needed 2 x 10 at 24"oc and would you sister back to a ledger for strength? Screws into the existed painted rafter?

I'm nervous about this now - but love the imput as it does help. Thanks

The solar is voltaic not for hot water- but will cover the roof. With penetration into the 2x 6 joists to hold the framework. Not sure of the intise weight - but guys will also be up there to service it.

Geekie girl!
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Old 02-01-2013, 04:29 PM   #6
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Existing Roofing 13' span. 2x6 w/ 48 oc spacing


I would not even walk on it.
PS roll roofing is the lowest of the low when it comes to roof materials.
Got a picture?
Screws are not used in framing. Sistering will do 0 good, it's the spans that are to far apart causing sagging and weak area between the rafters.
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Old 02-02-2013, 05:53 AM   #7
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Existing Roofing 13' span. 2x6 w/ 48 oc spacing


You have options to strengthen that roof----If there is not a lot of electrical wiring in the way--the work should not be to complicated---

Your roofer should be able to guide you----Mike-----
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Old 02-02-2013, 06:52 AM   #8
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Existing Roofing 13' span. 2x6 w/ 48 oc spacing


You need to figure out the design loads for this project. A roofer is not a structural engineer, he is a roofer. We do not know what kind of posts you have, what those posts transfer the vertical load to, what sort of wind uplift rating you need and how that might increase/ decrease with the imposition of solar collectors etc. etc. etc. We need pictures and data to help. Joe is correct. If all you have is roll roofing and 2 x 6's 48 inches on center. (Thats not even adequate for a wall, let alone a roof) You really dont have much at all invested here. You also need a deck that is thick enough to take the weight AND resist pull out. How the ledger strip is attached, and what it is, is another concern.

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Last edited by jagans; 02-04-2013 at 08:56 AM.
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