wantacoe
Well-known member
I am using 3 1/4" foam board insulation. I can only find a few screws that are long enough but then they are too heavy duty and expensive. Any ideas for some smaller more economical screws? Thanks
Screws for insulation sheets
- Thread starter wantacoe
- Start date
marak
Well-known member
I have used 3 1/2" deck screws by first boring a 1" deep x 1/2" dia. hole in the insulation with a forstener bit, which worked very well and made a clean hole, then used a 1/2" washer.
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Leaflessshadetree
Well-known member
Have you considered using nails?
Nthill93
Well-known member
4” deck screws are less than $40 for 5lbs
CraigStu
Well-known member
Could you glue them instead? I am pretty sure I have seen construction adhesive specifically for foam insulation. And there are some instant grab glues that I have used and worked great but they were for wood projects.
Could you glue them instead? I am pretty sure I have seen construction adhesive specifically for foam insulation. And there are some instant grab glues that I have used and worked great but they were for wood projects.
That may be an option but I am working in an unheated building. Not sure if the glue would dry in the cold?
That may be an option but I am working in an unheated building. Not sure if the glue would dry in the cold?
dfiler2
Well-known member
You may want to consider glue and screws, you just need enough screws to hold the sheet in place until the glue dries. Here are some 4" screws with the insulation plate on them.
GenTite 4 in. Insulation Screws with Plates (100-Pack) GTI334S3SP - The Home Depot
Visit the Home Depot to buy GenTite 3-3/4 in. Insulation Screws with Plates (100-Pack) 21485200
www.homedepot.com
duneslider
Well-known member
where is this going? Just curious if you are having a hard time figuring out how to attach the foam board, how do you plan to attach a final surface over the foam?
versico makes a foam adhesive called flexible dash. depends on what your substrate is but this is an option for you
the glues take longer to flash off in the cold but it can still be done.
danfromsyr
Well-known member
they sell drywall screws up to 4in.
$7.50/# about 47pcs... ~$.16ea
$7.50/# about 47pcs... ~$.16ea
Dumber than lumber
Well-known member
- Joined
- Dec 19, 2015
- Messages
- 1,901
Consider using the Great Stuff style of expanding foam. Use the foam as an adhesive. Cures pretty quickly, and you can put a little on a test board to monitor cure time.
Maybe make a frame or ledge type support structure from vinyl stucco edge material. Or similar light and cheap material.
Maybe make a frame or ledge type support structure from vinyl stucco edge material. Or similar light and cheap material.
I found these today. Price wasn't bad but then the shipping was $36. https://www.bestmaterials.com/detail.aspx?ID=14944
Here's a plastic washer type:
There used to be a version that had maybe a 3/4" countersink to it so it not only ended up flush, but you didn't need as long a screw. Can't find them now...
Ridgid insulation screw and washer, insulation fastener-Warehousebay
insulation board washer, Expanded Polystyrene Insulation Board fastener, EPS fastener, continuous insulation fastener, blue board fastener, pink board fastener, polyisocyanurate fastener, insulated stucco washer, insulated stucco fastener, eifs fastener
www.warehousebay.com
There used to be a version that had maybe a 3/4" countersink to it so it not only ended up flush, but you didn't need as long a screw. Can't find them now...
I actually have been searching for something similar at a reasonable price, but just the washer itself. I found these thanks to some of words in your linkYou may want to consider glue and screws, you just need enough screws to hold the sheet in place until the glue dries. Here are some 4" screws with the insulation plate on them.
GenTite 4 in. Insulation Screws with Plates (100-Pack) GTI334S3SP - The Home Depot
Visit the Home Depot to buy GenTite 3-3/4 in. Insulation Screws with Plates (100-Pack) 21485200www.homedepot.com
ADO Products 1.5 in. Square Self-Locking Insulation Anchors WAMK1512SM - The Home Depot
Secure insulation to wall anchors with the help of this ADO Products Square Self-Locking Insulation Anchors. Offers durability.
www.homedepot.com
To the OP, just an FYI, as someone who has driven literally 10s of thousands of screws over the years, you don't want to be screwing any 4" screws of that have a philips head, get some good torx head..JMO
you would be very very lucky to find them at a roofing company, we have been trying to purchase them for 5 months.... we have a shipping container supposed to come in feb, but its been pushed back 2 times already
rustyjames
Well-known member
The way to go is with adhesive for foam board, it's cheap and it holds. The only bad part is if it has to be removed. I've worked on demo jobs that were brutal removing the glued insulation board. Locktite makes adhesive for it. If you're applying it to painted surface use PL Preimum, otherwise the regular adhesive for foam board is fine.
toyotadriver
Well-known member
- Joined
- Dec 30, 2010
- Messages
- 1,586
This right here. Don’t use foam rated adhesives. Just use canned spray foam as an adhesive. Works WAY better than the foam rated adhesive.
67CarGuy
Well-known member
I've had good luck with the foam-rated adhesive in my previous garage, along with screws and plaster washers.
https://www.acehardware.com/departments/hardware/nuts-and-bolts/washers/5938576
The foam-rated adhesive probably won't like the colder temps right now if you're working outside. Cans of Great Stuff, etc. will likely work just as well, but be prepared to use the entire can once you've started, as the nozzles like to clog / seal up before you're through the whole thing (in my experience).
Is this above-grade wall insulation, below grade wall, or...? Interior or exterior? What are you screwing into - wood, I'm guessing? Rather than screws and foam / adhesive, can you just brace the insulation while the foam sets? Maybe some plywood plates on either end of some 2x4s?
https://www.acehardware.com/departments/hardware/nuts-and-bolts/washers/5938576
The foam-rated adhesive probably won't like the colder temps right now if you're working outside. Cans of Great Stuff, etc. will likely work just as well, but be prepared to use the entire can once you've started, as the nozzles like to clog / seal up before you're through the whole thing (in my experience).
Is this above-grade wall insulation, below grade wall, or...? Interior or exterior? What are you screwing into - wood, I'm guessing? Rather than screws and foam / adhesive, can you just brace the insulation while the foam sets? Maybe some plywood plates on either end of some 2x4s?
dutchgray
Well-known member
This, squirty foam cans glue insulation pretty well, can be messy though.
CraigStu
Well-known member
I have used foam to glue a 2x6x2ft to a concrete wall so I could then support a PVC pipe. It worked great. My concern w/ using foam for a 4x8 sheet is how much it may expand as it sets and will the expansion push the foam board out from the wall. I suppose one could make up some way to keep some pressure on the foam board as the foam sets. I don't know how critical it is in the OP's situation but I could see the foam board ending up w/ waves in it from uneven foam expansion. All the construction adhesives I have used have an acceptable temp range for their use in the instructions printed on the tube.
mike93lx
ALLIANCE MEMBER
It's through 3" of foam, not oak. Philips is fineI actually have been searching for something similar at a reasonable price, but just the washer itself. I found these thanks to some of words in your link
ADO Products 1.5 in. Square Self-Locking Insulation Anchors WAMK1512SM - The Home Depot
Secure insulation to wall anchors with the help of this ADO Products Square Self-Locking Insulation Anchors. Offers durability.www.homedepot.com
To the OP, just an FYI, as someone who has driven literally 10s of thousands of screws over the years, you don't want to be screwing any 4" screws of that have a philips head, get some good torx head..JMO
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FredWanaker
Well-known member
https://www.bestmaterials.com/detail.aspx?ID=14750 4" roofing nails - 50 lbs $65? plastic disks - 500 $22? https://www.amazon.com/dp/B005TE3C1G/?tag=atomicindus08-20
danfromsyr
Well-known member
following this rabbit hole of insulation anchors. I found that I can get 500 SS 3/4in fender washers for $20/delivered
these will suit my small need and I can use left overs on well alot of things.
these will suit my small need and I can use left overs on well alot of things.
500 Qty #8 x 3/4" 304 Stainless Steel Fender Washers (SNG817): Amazon.com: Industrial & Scientific
500 Qty #8 x 3/4" 304 Stainless Steel Fender Washers (SNG817): Amazon.com: Industrial & Scientific
www.amazon.com
i have heard a lot of ppl using these in the recent weeks
danfromsyr
Well-known member
in my past with a small siding job where I had 2in polyios on an exterior wall.
I used Plaster washers.. as I could get them in small batches at the big box store.
but now I'll have plenty of SS fender washers on hand ;-)
rapidmaterials.com
I used Plaster washers.. as I could get them in small batches at the big box store.
but now I'll have plenty of SS fender washers on hand ;-)
Grip-Plate Flat Washer 1000pcs
This 1-1/4 diameter Grip-plate galvanized steel washer is used to attach lath (for stucco or stone veneer) and plaster or stucco repair.
rapidmaterials.com