Good Sam Club Open Roads Forum: Attaching screws to aluminum floor joists
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Open Roads Forum  >  Do It Yourself Modifications and Upgrades (DIY)

 > Attaching screws to aluminum floor joists

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DavinD

Litchfield Park, AZ

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Posted: 06/05/19 04:17pm Link  |  Quote  |  Print  |  Notify Moderator

Short Version - Is it ok to use self-tapping screws to attach items to the aluminum floor joists on the ceiling of my basement.

Long Version - Like most basements, mine has a thin divider "protecting" the pluming and wiring from the stuff I store in the basement. That divider is only attached at the floor of the basement and on the two outside walls. In addition, they left a lot of open space in the "protected" area that can be used for storage if I clean up a few wires, etc. When I reconfigure this divider, would it be ok to attach wood framing to the underside of the aluminum floor joists to give the divider better support at the top. I would likely use self-tapping screws.


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tbr2015

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Posted: 06/05/19 07:15pm Link  |  Quote  |  Print  |  Notify Moderator

Can’t see why that would be a problem. I have done it on mine to attach things to them.

SDcampowneroperator

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Posted: 06/05/19 07:54pm Link  |  Quote  |  Print  |  Notify Moderator

electrolitic corrosion happens between dissimmilar metals. Maybe use aluminum pop rivets instead?

owenssailor

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Posted: 06/05/19 08:28pm Link  |  Quote  |  Print  |  Notify Moderator

SDcampowneroperator wrote:

electrolitic corrosion happens between dissimmilar metals. Maybe use aluminum pop rivets instead?


If it is a dry location corrosion should not be a problem. On our boat there are Stainless screws into the aluminum masts. They get wet and then dry. They have been there for 56 years and are still all fine.


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naturist

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Posted: 06/06/19 05:49am Link  |  Quote  |  Print  |  Notify Moderator

I would not expect electrolytic corrosion to be much of a problem generally with aluminum because of the aluminum oxide that always coats the aluminum. Certain conditions (such as in car cooling systems with the wrong coolant) being exceptions. If the OP’s screws stay dry, or see only fresh water at near neutral pH, there should be no issue with electrolytic corrosion.





Dusty R

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Posted: 06/06/19 07:53am Link  |  Quote  |  Print  |  Notify Moderator

Perhaps insert plastic concrete anchors in the aluminum and then the screws into the plastic anchors.

Cummins12V98

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Posted: 06/06/19 09:04am Link  |  Quote  |  Print  |  Notify Moderator

Plated screws are FINE!!! I would suggest trying sheet metal screws first as the driller screw will remove a lot of material and the aluminum does not have the holding power as other metals.


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Hammerboy

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Posted: 06/06/19 12:22pm Link  |  Quote  |  Print  |  Notify Moderator

I did to my current and past units and not a hint of a problem. As said if it's dry you wont have a problem.

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DavinD

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Posted: 06/06/19 04:02pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for all the replies. If my basement ceiling gets wet, I've got bigger problems. [emoticon]

mapguy

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Posted: 06/07/19 02:30pm Link  |  Quote  |  Print  |  Notify Moderator

Use rivet nuts -that way you can r&r the dividing panels an endless amount of times. With sheet metal screws -you will get a limited amount of r&r's before threads are gone and larger screws are needed.

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