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Material to put in walls to reduce penetration

Discussion in 'General Gun Discussions' started by Fryerpower, Feb 15, 2013.

  1. Skylerbone

    Skylerbone Well-Known Member

    The resin used is beyond toxic with fumes that could choke a skunk, not a good choice for inside work. I glassed a cedar strip canoe I built at age 16 and didn't know any better but I do recall that smell. It would be difficult to pre-form pieces elsewhere to install later, especially with scrap. Good for noise control, bad for health.
  2. unlimited4x4

    unlimited4x4 Well-Known Member

    Mythbusters episode 112 "coffin punch"

    Check out this episode. Very interesting. Used two 12x12 sheets of small bathroom tiles and a fiber reinforced gypsum grout/cement. It stopped 9mm, 45 acp, and buckshot. Did not stop .223 or slug, however it would be where I start if I wanted to use household items to make a bullet proof wall. Search the survivalist forums, there are threads on this topic too. Do some testing, I bet you can come up with something. You want materials that absorb energy, so rigid is not always best, look for some sort of mesh material, like a thin steel mesh that might cause the bullet to fragment before it hits the tile layers. Good luck, and if you figure something out report back!
    Last edited: Feb 15, 2013
  3. jbkebert

    jbkebert Well-Known Member

    I have used armortex in commercial construction. heck I still have about three sheets of the stuff. It went inside the judges bench the witness bench, and the walls to the judges chambers. A pain in the tail to cut needs to be abrasive wheel or diamond blade. It will jamb a nail gun. The only good means of installing is pre-drill than use screws.

    My little testing showed that it would stop a .44 mag from 10 feet. A .223 drills a little hole right through it. A .300 win mag blows a baseball sized hole through it. This was with level two.
  4. Skylerbone

    Skylerbone Well-Known Member

    Not sure why .223 continues to be mentioned. I watched an episode of TacTV? with The LV shooting numerous calibers into mock walls of traditional construction spaced 12' apart. 9mm FMJ went through the 3 or 4 walls they had constructed (2X4 sandwiched with drywall), through the aluminum siding of the far wall and was lost. Buckshot IIRC penetrated 4 layers (through first wall, across the "room", into back of second wall) and .223 FMJ broke up between the first and second layer of wall #1 leaving 3 small fragments in the far wall of second wall. My guess is that fewer than 20% of the 55gr. bullet crossed the room to the far wall. I'd bet it would not make it past 1 layer of Sheetrock and 1 3/4" of stud.

    As the OP mentioned, the intruder's choice of ammo is the primary concern. As for me, rooms are arranged such that I should not have to fire in the direction of another bedroom or have a perpetrator shooting toward my children either but that is only the idea. I hope to never test such a plan. Centered around Rule #1.
  5. Al Thompson

    Al Thompson Moderator Staff Member

    Bookcases make good cover. :)
  6. Fryerpower

    Fryerpower Well-Known Member

    Bookcases or bookshelves

    Yes they do...

    Do them as built in book shelves so that you have an excuse to pull the drywall, fill the void with something to soak up the energy, build the book cases with 3/4 inch plywood at the back bolted directly to the studs.

    Perfect excuse to go in there in the first place, great looking addition to the room, plus all of the books on the shelves can help if anything gets through.

  7. brboyer

    brboyer Well-Known Member

    Low-tech: A couple strategically placed book shelves - Problem solved.

    ETA: Al beat me to it. :(
  8. zxcvbob

    zxcvbob Well-Known Member

    Anybody know how well Hardibacker works? (fiber-reinforced cement board) Use that instead of gypsum.
  9. jim243

    jim243 Well-Known Member

    Shreeded denim jeans. Do not compact them, but should work as well as kevlar. You want sufficient air space within the material to break up the path of the bullet.

  10. ball3006

    ball3006 Well-Known Member

    Question, why are you shooting the walls in your place? chris3
  11. Arp32

    Arp32 Well-Known Member

    These are just the kinds of silly questions that derail a good thread!
  12. Isaac-1

    Isaac-1 Well-Known Member

    The resin used is beyond toxic with fumes that could choke a skunk, not a good choice for inside work. I glassed a cedar strip canoe I built at age 16 and didn't know any better but I do recall that smell. It would be difficult to pre-form pieces elsewhere to install later, especially with scrap. Good for noise control, bad for health.

    Your probably thinking of the old style polyester resin, not epoxy resin which is mostly odorless
  13. jim243

    jim243 Well-Known Member

    He is not, he wants it to go with the tin foil hat he is wearing (LOL).

    Remember that no matter what you put in the walls, it will not stop a 300 Win Mag, 338 mag or a 50 BMG.

  14. JonnyGringo

    JonnyGringo Well-Known Member

    Hardibacker won't stop a pellet gun, however it is an excellent fireproofing material. I have done extensive testing with this material with excellent results

    The O.P. I have hands on experience with your situation. I made a mock-up wall panel 2x4 construction with 1/2' ply on each side and filled it with DRY 3/4 crushed gravel. It stopped close to 100 .223 rounds, three clips of .308, and finally succumbed to repeated blows from my 338 win mag. The gravel inside was pulverized a bit with each successive shot and eventually settled to the point that it had insufficient mass to stop the assault, however that was after major punishment. I would sit behind that with confidence under direct fire from a wide range of weapons for quite some time. Build one of your own and conduct your own testing, I think you will be amazed by the results. Crushed gravel is much lighter than just about anything else with sufficient density to stop penetration and is much cheaper than anything else you could think of. Make sure it's DRY. Also make sure you provide some additional support at all necessary bearing points.
  15. r1derbike

    r1derbike Well-Known Member

    I like the bookcases idea! Brilliant!
  16. Skylerbone

    Skylerbone Well-Known Member

    I almost threw out the phone book suggestion but I'm sure no one wants a massive stack of paper in the walls in case of fire. Add denim to that list.

    The problem I see with bookcases is both the lack paper books these days and the not so cheap necessity to fill them, two walls worth, before they become effective. Let's also not forget that kids are born believing everything is an obsticle to be climbed. I remember fondly the 5' tall dresser I frequently used to launch myself across my own room onto the bed. Iiiiiiit cooood have endedddd in bwain damnage.

    Gravel would be great with the exceptions of weight and a days worth of wheelbarrowing it would take to move it.
  17. Tomcat47

    Tomcat47 Well-Known Member

    Best economical alternative I can think of....

    And to take it a step further, before laying brick wrap it in kevlar instead of Tyvek! :)

    Attached Files:

  18. hso

    hso Moderator Staff Member

  19. Skylerbone

    Skylerbone Well-Known Member

    Did some looking into that one but every report said rifle bullets, specifically .223 Rem. cut right through it. I'd almost bet it would work using the 2X or plywood backing but tough to say.

    Did some demo of UHMW tanks last year that were used for liquid storage and badly wanted to take some home for woodworking jigs and target backers but alas, against company policy. At one point I had to cut holes around the perimeter to collapse the roof and this stuff was murder on blades even some 25 years after exposure to petroleum products on a continuous basis. With hso's HDPE suggestion, I Googled "UHMW bulletproof" and found a video of .45ACP vs. 1" wherein the bullet was stopped but a high velocity pointy round...

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