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paulmars
Participant

Join Date: Apr 2018
Posts: 3

Compatibility Question

04/30/2018 9:54 PM

Im installing a galvalume metal panel roof. Supplied steel screws are used to hold the panel clips to the roof wood deck. Some of the wood is rotten and/or termite damaged. So, we have been replacing that with treated wood. I just heard that galvalume is NOT compatible with treated wood. Several sites did say that the peel and stick underlayment is sufficient barrier. However, that leaves the screws. Steel screws are NOT compatible with treated wood.
Some sites say hot dipped galvanised is compatible with treated wood, however hot dipped is still zinc and zinc is NOT compatible with treated wood.
What can i do, other then replace the treated wood?
paul
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JNB
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Join Date: Aug 2012
Posts: 1071
Good Answers: 92
#1

Re: compatibility question

04/30/2018 11:01 PM

What you can do is use stainless steel screws, or find ones that have a non-metallic coating specifically for the newer types of treated wood (eg ACQ type). Depending on the type of screw you need, you may be able to find them at a big box store or else a fastener specialty supplier.
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paulmars
Participant

Join Date: Apr 2018
Posts: 3
#2
In reply to #1

Re: compatibility question

04/30/2018 11:29 PM

I forgot to say. SS is NOT compatible with galvalume.
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handeerestaurant
Participant

Join Date: May 2018
Location: Ranchi, Jharkhand
Posts: 1
#7
In reply to #2

Re: compatibility question

05/17/2018 2:34 PM

good

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lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#3

Re: compatibility question

04/30/2018 11:43 PM

Pressure Treated Wood and Building Materials Studies and Survey ...

"Fastener manufactures such as ITW Buildex are offering solutions. 410 stainless steel ACQ-resistant proprietary coating and durable proprietary coated carbon steel proved to be the most corrosion-resistant according to the ACQ extract test. Although in many cases the corrosion observed in this testing was only surface corrosion, many contractors are uncomfortable using fasteners that accumulate large areas of surface corrosion."

Good luck. If you live in a desert, you'll be OK.
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SolarEagle
Guru

Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33392
Good Answers: 1817
#4

Re: compatibility question

04/30/2018 11:57 PM

These should work...

...or ceramic coated...

http://www.deckmagazine.com/design-construction/fighting-fastener-corrosion_o

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paulmars
Participant

Join Date: Apr 2018
Posts: 3
#5
In reply to #4

Re: compatibility question

05/01/2018 9:04 PM

i just pulled the treated wood, It is just too risky.
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SolarEagle
Guru

Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33392
Good Answers: 1817
#6
In reply to #5

Re: compatibility question

05/02/2018 9:55 PM

Yeah I think unless the wood is directly exposed to the weather, or has ground contact, will stick with exterior grade or sealed lumber....Might have known, it seems anything that works well the environmentalists figure a way to screw it up...What good is rot resistant lumber if the structure collapses....morons

https://parr.com/blog/selecting-exterior-lumber/

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White
Member

Join Date: Jul 2018
Posts: 6
#8

Re: Compatibility Question

07/13/2018 10:31 PM

If there is no other way, you may try to replace the treated wood.
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Users who posted comments:

handeerestaurant (1); JNB (1); lyn (1); paulmars (2); SolarEagle (2); White (1)

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