Welcome back to Albany County Fasteners - Fasteners 101. I'm Bob and today,
I'm going to show you how to install a double expansion anchor in brick.
But before we do that: please subscribe, like, and share my videos. Hit the bell so you get notified of future videos.
Let's get started.
So I have here a double expansion anchor and this is made to use in brick applications.
These are the wedges in here. When pressure is applied it evenly disperses pressure on the circumference of the anchor.
The reason for that is, in a brick, if you use a regular anchor, a wedge anchor or drop-in anchor,
it puts pressure on the bottom portion only.
If you do that, it will tend to crack the brick.
By using a double expansion anchor, that allows the anchor to distribute pressure evenly across itself.
You can see that by the expansion happening now. So I'm going to take it out-there we go.
So I got this out now.
You can see it's expanded in both directions. Once I push on it,
it pulls those two wedges in each direction against each other, or towards each other.
Then, you can see, it's fully expanded now. So if I just tap it to get those wedges to back out again...
Okay now they're out. You can see how it's expanded.
It has the threading of the the screw at the bottom portion of this.
On the top portion there's no screw threading. It's just a clean inside shank in there, or a clean inside hole.
When you drop this in you got to make sure that the threads are at the bottom.
Not at the top. If they're at the top, the anchor is not going to expand properly.
You're gonna have a problem.
So I'm going to drop this in now and I'm going to show you how to set it.
I have the threads here on the bottom. The bottom goes in first and just slides right in.
Almost like a drop in anchor. It's almost the same effect.
We're going to put this piece of wood over the top to fasten just for demonstration purposes.
Now these double expansion anchors are not made to apply very heavy stuff to the brick.
But they do provide good anchorage.
Okay, it's expanding and tightening. As you can see it's drawing in the screw and the washer right there.
There you go. You can see it properly fastened.
Now a couple of key items here: the length of the screw is very important.
If the length of your screw is too long it's gonna bottom out against the bottom of the brick,
and it's gonna push that anchor out.
Then it's going to protrude past the brick and you're going to run into application issues.
So you want to make sure that your screw is properly sized in length.
Other than that, it's a great anchor. Thanks for watching.