1. #1
    Forum Member

    Join Date
    Jan 2006
    Posts
    44

    Default 4x4 Cribbing Edge question

    Ok. Here’s one for ya. I am a member of a small paid department in FL. We have a fair amount of cribbing. However, there seems to be a difference between some of the pieces. Someone had a question regarding the edges of some of the cribbing. We have your traditional perfectly square pieces. Meaning that all four outside edges are squared. The argument is regarding a couple and possible future pieces of cribbing having rounded edges. The argument against the rounded edge type is its ability to bite into other pieces of cribbing and whatever is being cribbed. Its possible that we set up a test and see if the rounded edges do encourage or at least don’t prevent slipping/ rolling, but I am wondering if there is a clear answer on this. Does FEMA/ or Army corps. Of Engs. have a rule on this? Does all cribbing in your cache need to be as uniform as possible? Would the rounded edges be considered unstable? They certainly seem more unstable when a light load is applied (someone standing on the stack) but would a heavy load "lock" them more in place? I hope I've formed my question well enough to make sense. Thanks for reading.

  2. #2
    Forum Member
    Picc.93Truck's Avatar
    Join Date
    May 2010
    Location
    Old Forge, PA
    Posts
    207

    Default

    Without any actual test, my opinion would be that certainly the straight "Boxed" Edges would be more secure, Although if this is such, why in the world would one take the time to round such edges off, when they come boxed?!
    Firefighter 1/ PA EMT-B

  3. #3
    Forum Member

    Join Date
    Nov 2002
    Posts
    1,165

    Default

    What is the cribbing made of? Is it wood or is it plastic? I really don't think a rounded edge is going to make much difference. The most important factor in the cribbing itself would be the material it's made of and the texture of the flat surface on the sides. That and and a properly made box crib are more important than the edges. If your cribbing would roll or slip, it's because of factors other than the corners. Adding grit to the sides is going to reduce slipping, not square corners. A properly stacked box crib should eliminate most of the problems to begin with.

  4. #4
    Forum Member
    TillamanTrk1's Avatar
    Join Date
    Jan 2010
    Location
    Metro-Atlanta
    Posts
    113

    Default

    Quote Originally Posted by johnsb View Post
    What is the cribbing made of? Is it wood or is it plastic? I really don't think a rounded edge is going to make much difference. The most important factor in the cribbing itself would be the material it's made of and the texture of the flat surface on the sides. That and and a properly made box crib are more important than the edges. If your cribbing would roll or slip, it's because of factors other than the corners. Adding grit to the sides is going to reduce slipping, not square corners. A properly stacked box crib should eliminate most of the problems to begin with.
    Agreed. The edges shouldn't matter if you are cribbing properly..
    "....train as if your life depends on it, because one day it could.."
    .....Leather Head N6A
    Tillerman..... The best job in the FD!!!

  5. #5
    insert witty title here

    Join Date
    Aug 2006
    Location
    Northern VA, USA
    Posts
    76

    Default

    I would think the rounded edges would roll easier and make the tower less stable. FEMA/USAR uses normal cribbing for a reason.

  6. #6
    Forum Member

    Join Date
    Nov 2002
    Posts
    1,165

    Default

    Quote Originally Posted by jeremymader View Post
    I would think the rounded edges would roll easier and make the tower less stable. FEMA/USAR uses normal cribbing for a reason.
    Squares don't roll. If a piece of square or rectangular cribbing rolls, you're doing it wrong. And describe "normal cribbing". 4x4's can come with either a 90 degree corner on the the edge or one with a 1/4" radius. Either will work the same as cribbing when used properly.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Cribbing Question
    By nc1130 in forum University of Extrication
    Replies: 3
    Last Post: 04-06-2007, 05:42 AM
  2. Whelen edge
    By k1500chevy97 in forum Apparatus Innovation
    Replies: 58
    Last Post: 06-12-2004, 03:14 PM
  3. Truly...taking it to the edge!
    By NJFFSA16 in forum The Off Duty Forums
    Replies: 1
    Last Post: 11-06-2003, 01:05 PM
  4. Quick question about cribbing...
    By SilverCity4 in forum University of Extrication
    Replies: 11
    Last Post: 09-13-2002, 07:12 PM
  5. Cribbing Question
    By Engine613 in forum University of Extrication
    Replies: 16
    Last Post: 10-04-2001, 10:49 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Log in

Click here to log in or register