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kkbayers 06-21-2012 08:12 AM

Threaded Wood Inserts for Gutters
Does anyone have experience with Threaded Inserts for wood?
I live in a area where my gutters are being ripped from the eaves due to the snow sliding very slowly off of the metal roof.

I plan to remove the gutters every Winter.

When I built the house I used 2x6 across the rafter tails and then installed 1x6 cedar fascia so I have plenty of material to install the inserts.

What is the best insert made for exterior application and what is the best glue to put on the insert so it stays put?

JulieMor 06-24-2012 12:09 PM

I don't think inserts will help unless their installation is accompanied with a bonding agent like epoxy. The problem lies in the properties of the wood vs the properties of the metal. Wood shrinks and swells disproportionately to metal. When wood swells around a metal fastener, the wood fibers are crushed. They do not "rebound". When the wood shrinks, the hole created for the fastener expands and the fastener can come loose. Any type of insert that is metal would also crush the wood fibers. I don't know of any plastic inserts I'd use to support gutters.

As far as inserts go, you can get brass or stainless steel inserts that you thread into the wood and then use a machine screw to fasten the gutters. The inserts would provide a larger surface area to bite into the wood but you would still have the swelling/shrinking issue.

Another option would be toggle bolts. But I would not use the spring type as they would probably fail. Hilti makes what they call a toggler bolt:
I've used them at work for heavy loads and I've never seen one fail. But there could be a problem with the gutter metal failing if the load is that great.

Since I don't know the forces at work with the weight of the snow on your gutters, I don't know how large a bolt you would need but I would think 1/4" should do it. Just snug them up tight.

CopperClad 06-24-2012 12:20 PM

What are the original gutters attached to and with what? How far apart are the gutter brackets? Did they come with supplied galvanized nails/screws which is typical? What sounds like to me is your nails/screws aren't biting enough into the 2x6 fascia due to the fact you added a 1x6 cedar subfascia. millions of homes in snow loaded areas aren't having their gutters pulled off the house due to snow because it was installed properly. Short screws/nails/brackets being too far apart sounds like the issue. Good luck !

Tom Struble 06-24-2012 01:34 PM

1 Attachment(s)
maybe use a wrap around hanger?

install them permanently and unclip and remove for the winter

joecaption 06-24-2012 04:13 PM

Are you using gutter nails or screws?
For a normal 5" gutter we just use hidden gutter hangers.
It you place them every 3' you can hang off the gutter and not have them pull out.

Tom Struble 06-24-2012 04:27 PM

not with 6 tons of ice in it you can't

kkbayers 06-25-2012 02:23 PM

I have used all sorts of fasteners, screws & Nails. I have increased the quantity to every 3 feet but it continues to fail.
Imagine a iceberg 2 feet thick creeping down a roof that is 24 feet wide and 41 feet long to the peek. I like the idea of a wrap around type but have never seen them.

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