Rain gutters

bus_driverMay 2, 2013

What causes screws to back out-- to unscrew themselves-- from gutter hangers? About 6 years after installation, almost all the screws had loosened appreciably. Just as if they had been backed out with nut driver. They were not stripped in the wood. I applied Gorilla glue and tightened the screws, but they have backed out again within 4 years. .
Aluminum one-piece gutters, aluminum hangers and zinc plated screws. I know about electrolysis, but this is what all the installers use.
What is causing rotation of these screws?

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geoffrey_b

Is this on all sides of the building?

Do they go through a 'tube' or bracket and screw tightly in to the wood?

They screw into the facia?

The only thing I can guess is the wet / dry = expand / shrink of the wood that they are screwed in to.

    Bookmark   May 2, 2013 at 11:45AM
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annkh_nd

Where I live, it would be wind.

    Bookmark   May 2, 2013 at 12:01PM
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brickeyee

No locking device used, screws come out.

    Bookmark   May 2, 2013 at 1:58PM
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bus_driver

Plenty of wind on the side of the house where the problem is worst. 30 feet up also. Wind and thermal cycling were my two guesses. The fascia is covered with aluminum coil stock and determining the rafter ends is impossible. Plus the rafters are mostly 16" on center, but some are less-- as little as 6 1/2 in one case. The original installer spaced the hangers about 32" and used only 1" screws.
Due to wind damage, this one 50' section was replaced yesterday and they (different installer) used 3" screws which mostly went into the fascia board. We'll see how it works out.

    Bookmark   May 2, 2013 at 6:02PM
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southerncanuck

Wind, happens only on my western exposure blowing off the lake.

    Bookmark   May 3, 2013 at 12:49PM
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millworkman

1" screw in soft pine, 50 ft run. You do not see it but but the gutters move with the wood expanding and contracting, the wind, rain in the gutters everything causes movement and the screws just back out from the movement and vibration.

    Bookmark   May 4, 2013 at 8:37AM
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