What would be ideal screw to use to attach vertical furring strips onto the exterior of an icf wall?
We tried deck screws and the screw wants to strip out rather than countersinking the head.
The furring will be receiving 4’x8′ x 7/16″ Hardi Panels.
I have to pick these fasteners up on Monday morning, so I’ll appreciate all the help I can get from y’ll weekend warriors.
FKA Blue (eyeddevil)
Low-e storm panels improve the energy efficiency of these old sash windows without changing their classic look.
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Replies
Jim,
Unless you'll be using a specialty screw for concrete you may need to drill and use plastic shields to use with the deck screws.
Walter
the slateman
I'm sorry, you are wrong.. Most ICF's have a strip of either nylon or steel to screw into.. it's designed for just that No need to use anchor bolts or some such nonsense..
You can find where that strip is by looking at the pattern printed on the outside of the foam Reward forms has two raised ridges about an inch wide where you put the screws in. #8's with fine thread about two inches long.. I don't like piffin screws but they will work
We are using the reward system and there are the strips imbedded about 1/2" below the surface. The deck screws are too course and we are going to get some finer threaded ones. I'm concerned about rust, so I want something galvanized. I know I've seen them somewhere...I just don't remember where. The local fastner store has a 25# box of zinc plated screws 2.5" long. Does zinc plated qualify as water resistant? FKA Blue (eyeddevil)
Blue,
zinc is a soft sacrificial material quickly eroded away, so no it wouldn't qualify
Edited 11/10/2007 9:55 pm ET by frenchy
" zinc is a soft sacrificial material quickly eroded away, so no it wouldn't qualify"What do you think that galvanization is?.
.
A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.
Now you've done itAnother opportunity for him to fabricate a story.
Oh well, it'll be good entertainment anyways.
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Bill,
Most zinc is flash plated, most galvinization is built up to a thickness that affords protection for the underlying steel.
But then you knew that, what just trolling again?
Jim,
The zinc plating is probably electroplate, where current is used to bond a light layer of zinc to the surface of the metal That is most common with screws, but hot dipped galvanized is adifferent proicess that will apply much more zinc. I do not think that you will find fine thread screws in full galvanized though.I would use some PL 300 to adhere the furring along with the screws. The combination would give doubled strength and help to seal around the screws so there is little chance that the screw will ever see enough moisture to rust
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Not trolling, trying to set the record straight.Zinc is Zinc.Now there are differences if thickness of zinc that determines how long the protection will last for any given application.You also need to look at the application.Deck screws that are exposed to constant rain and in contact with copper based PT lumber require must higher level of protection and then screws in a nominally dry area, that might get wetted only in server storm..
.
A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.
Edited 11/11/2007 12:38 pm by BillHartmann
Bill,
If you read the post Blue wants to put screws into ICF's that calls for a fine thread screw.. Fine thread screws are not usually galvanized. It will fill up the threads.
I have just hung 50 sheets of metal lath to a ICF building and the arct. spected 2" s.s. screws with 3/16ths s.s. flat washers , they had used a system that had the plastic bars marked from the outside with a series of vertical 8888's every 8 " I only had about 10 screws strip or break--I coudn't find washer headed screws for lath any where around here that were long enough so I used the deck screws and he signed off on it . I was told later after I finished hanging and stuccoing the lath that McFeeley's has what I needed didn't think to look there .
GRK has them too.
Their cabinet screws and their laghead screws both, and you can get them in SS
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I can get then eletrogalvanized all day long. It is just hot dipped that are unlikely in fine threading. Bill is pointing out that the only way you are going to get the zinc on the screw is to galvanize it.
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I use the GRK Canada bugle heads. They have a cutter on the back bevel edge of the head that countersinks itself.
now finding them by monday ....
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Taunton University of Knowledge FHB Campus at Breaktime.
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Blue,
most ICF forms accept screws. there is a strip of nylon or steel usually every six inches.. fine threaded about 2 inch counter sunk. Piffin screws will work in a pinch. or you can find some designed for outside use. (piffin screws will eventually rust)
The only trick is to find where the form accepts them. On Reward forms they are two slightly raised strips about an inch apart 6 inches on center. I've seen them as small little grooves and just ink lines.
"piffin screws will eventually rust"Just for the sake of those reading who do not understand the inside joke here, a piffin screw is a sheetrock screw nicknamed after me because I am almost as firm and cconsistant in telling people NOT to use them for anything other than sheetrock as you are in telling people to use shellac on their floors.Sheetrock screws should never be used for this, even when they are galavanized against rust because they do not have the strength for connecting a wood surface without a high percentage of them fracturing at the shoulder.
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Piffin,
I think aside from the rust issue in this application It would be extremely unlikely to pop the head off.. There's just not enough for them to screw against..
Thanks for clearing up that inside joke for me. I've been wondering about that for a while now.------------------
"You cannot work hard enough to make up for a sloppy estimate."
Yeah, I have been on a rampage a couple times when guys suggest hanging the wall cabinets with them. I can't count how many times I have been demo-ing a kitchen to discover that the cabs were hun with SR screws and 30% of them are already broken. One cab that had been full of heavy china was hanging by only one screw god out of six - three into wall had snapped and two into adjacent cabinet.The screw metal is cheap and brittle so when the shoulder of a screw head coms tight against wood but is only engineered to be good against poaper and gypsum, it snaps. Sometimes, I think it is a micro fracture that doesn't show up untill later when loaded or vibrations set in, such as This case with Jim where he will be nailing something else to the furring strips after setting the screws.At a safety class one time, the instructor showed an accident scene with multiple injuries and I think one death where a stageing collapse was due to the fact it was built with long sheetrock screws instead of structural lags. The screws broke off.
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yes, but the Piffen screw is one of the best on the market, avaible at all your local hardware stores