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Old 07-05-2012, 07:41 PM   #1
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Furring for ceiling sheet rock - choice of wood


I am remodeling my house and much of the ceiling sheet rock is down.

The trusses are for the most part OK but the old furring strips were eaten up by termites badly (good thing they ate the furrings and not the trusses).



I have removed all the old furrings and now am putting up new 1x3 furring strips.

I have to furr out the ceiling because old recessed lights, electrical boxes, air conditioning returns and vents and other ceiling fixtures are all set at the old height, and if I don't furr them out I have to start moving those.

However, when I bought the new 1x3 from the home center, I wasn't paying attention, on one trip I got 24 strips of regular 1x3s, and on another trip I got 24 strips of PT 1x3s. It was not until I was half way through I noticed some were PT and some were not. To my surprise the PT 1x3 seems to be softer and more fragile. I noticed that because they seem to split easier and my impact driver seem to run through them much easier.

However, for 2x4s the PT 2x4s are harder than the non-PT 2x4s, why would the PT 1x3s seem to be softer? They almost look like the soft wood you use for outdoor fences.

Should I remove all the PT 1x3s and replace with regular 1x3 or it's OK to mix and match?

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Old 07-05-2012, 08:31 PM   #2
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Furring for ceiling sheet rock - choice of wood


the main issue is fasteners. you will need galvanized fasteners in the treated lumber, in both the way it is fastened to the 2x and for the drywall fasteners. because the treated is mingled then galvanized for everything...

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Old 07-05-2012, 08:48 PM   #3
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Furring for ceiling sheet rock - choice of wood


I have been using mostly exterior screws to attach the furring strips to the bottom of the trusses.

Grip-Rite #7 x 2 in. Coarse Polymer-Plated Steel Bugle-Head Phillips Exterior Screws


In some cases I also mixed in some 1-5/8" drywall screws.
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Old 07-05-2012, 09:14 PM   #4
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Furring for ceiling sheet rock - choice of wood


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Originally Posted by miamicuse View Post
I have been using mostly exterior screws to attach the furring strips to the bottom of the trusses.

Grip-Rite #7 x 2 in. Coarse Polymer-Plated Steel Bugle-Head Phillips Exterior Screws


In some cases I also mixed in some 1-5/8" drywall screws.

you will want to make sure the screws in the treated 1xs are the exterior ones and plan on using galvanized/exterior screws to put up the shreetrock on the ceiling.
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Old 07-05-2012, 10:12 PM   #5
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Furring for ceiling sheet rock - choice of wood


Only ACQ approved fastners can be used in pressure treated lumber.
The new treating is done with copper any steel of galvinized fastners will just rust off shortly from electrolisis.
Ceramic coated deck screws will work.
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Old 07-05-2012, 10:42 PM   #6
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Furring for ceiling sheet rock - choice of wood


That seem like a lot of trouble to have to worry about what type of fastener to use where, may be it's easier to just take down all the PT lumber and put up the non-PT ones.
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Old 07-05-2012, 11:03 PM   #7
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Furring for ceiling sheet rock - choice of wood


Wait, something doesn't make sense.

I removed a lot of sheet rock from the walls too. The exterior walls have 1/2" PT furring strips attached to the concrete blocks. The sheet rock attached to the furring using standard dry wall screws. After 40 years those screws were not rusted. Why haven't those screws rusted?
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Old 07-05-2012, 11:17 PM   #8
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Furring for ceiling sheet rock - choice of wood


You're not supposed to attach sheetrock to treated wood. There's been more than one instance when a builder I used to know had to tear a wall apart due to sheetrock being attached to treated wood. The reason is treated wood generally comes a lot wetter than non treated, resulting in more twisting and cupping over time. You might be o.k if they are only 1x4's, but you're still taking a chance. If they are wet when you attach the sheetrock then you'll run into problems.
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Old 07-06-2012, 06:45 AM   #9
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Furring for ceiling sheet rock - choice of wood


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Originally Posted by miamicuse View Post
Wait, something doesn't make sense.

I removed a lot of sheet rock from the walls too. The exterior walls have 1/2" PT furring strips attached to the concrete blocks. The sheet rock attached to the furring using standard dry wall screws. After 40 years those screws were not rusted. Why haven't those screws rusted?
Older PT was treated with "Chromuim Copper Arsenate". The newer stuff is treated with "Alkaline Copper Quaternary" which is much more corrosive to steel fasteners.
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Old 07-06-2012, 08:19 AM   #10
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Furring for ceiling sheet rock - choice of wood


why not use 7/8" or 1-1/2" resilient channels?
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Old 07-06-2012, 09:18 PM   #11
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Older PT was treated with "Chromuim Copper Arsenate". The newer stuff is treated with "Alkaline Copper Quaternary" which is much more corrosive to steel fasteners.
How about using SPAX stainless steel screws?
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Old 07-06-2012, 09:22 PM   #12
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Furring for ceiling sheet rock - choice of wood


That would work just a whole lot more money to do the same job.
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Old 07-06-2012, 09:45 PM   #13
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Furring for ceiling sheet rock - choice of wood


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why not use 7/8" or 1-1/2" resilient channels?
This what i would do too,would be alot eaiser.
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Old 07-07-2012, 09:31 AM   #14
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Furring for ceiling sheet rock - choice of wood


I never heard of resilient channels. Looked it up, is it easy to use?

In my case I can't use it because I didn't take down all the furrings, only 70% of those that were affected by termites.

But I am thinking may be I can use it on walls. However, if you use these channels, how sturdy is it? If I have to mound cabinets, shelves, wall mount sinks etc...do I need to put in backing boards flushed with the face of these channels right?
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Old 07-08-2012, 08:23 AM   #15
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Furring for ceiling sheet rock - choice of wood


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I never heard of resilient channels. Looked it up, is it easy to use?

In my case I can't use it because I didn't take down all the furrings, only 70% of those that were affected by termites.

But I am thinking may be I can use it on walls. However, if you use these channels, how sturdy is it? If I have to mound cabinets, shelves, wall mount sinks etc...do I need to put in backing boards flushed with the face of these channels right?

I used miles of that stuff back in the 90's renovating an ancient motel. it works great for soundproofing. we always used hat channel installed vertically for furring strips on the concrete block walls though in most cases.

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