Testing day is here at last
So after a long week of waiting today's the day. I need to install a new lock out in West Vancouver and get some real work done at my home but the afternoon will all be about product testing these uncoupling membranes.
I heard yesterday that Laticrete has a new uncoupling mat of their own. This new Strata Mat needs to be tested along side Ditra, Noble and Spider Web I'm thinking. I read that the Strata Mat has tiny holes in it so it allows the air to escape easier than say Spider Web. This is a clever idea I'm thinking first off. Lets put it through the ringer and see if Strata Mat can hold it's own head to head with Noble, Ditra and SpiderWeb II.
Just visited Laticrete's Face Book page and they have some pictures up showcasing their new uncoupling system - https://www.facebook.com/LATICRETE?fref=ts
Well we did not get much time to test the samples today. I did manage to get one up and started with the brick secured to the cement board with Laticrete 254.
First I filled up one garbage can of water 150lbs
Then another 300 lbs total
Then a third 450 total
Then a fourth 600 lbs
Then a fifth 750 lbs.
Then my ropes crapped out and one can slide down to the ground.
I left it sitting there with 600lbs of weight on. I'll see if it's still there in the morning. Amazing the holding power of a brick!
Pictures of the shear testing control test
Uncoupling membrane - shear testing (Ditra with Laticrete 254 Platinum)
So yesterday saw another round of shear testing. I hooked up the Ditra sample set with Laticrete 254 Platinum and started added some weight. Before we did this we reset the brace and added a scrap of 1"x4" and a 2"x12" off cut. This beefed up the brace and moved the rig out a little so the garbage cans would not rub the fence.
I rigged up a metal bar to help with the weight and thought it would be a good attention to the test. This worked well but the strength of the rope is the real draw back. I will need to find a better way of weighting these tests. The Ditra held great and the ropes snapped at about 820 lbs.
Here is a look at yesterdays testing.
Down a garbage can! LOL I need chain and a new rig!
At about 820 lbs the ropes snapped. Clearly I know the limit of this old rope but finding out how strong these bricks are really set is going to be a challenge.
Today we will test the Spider Web and see if it can hit the 800lb mark. Then we will test the stock set with the AF207. If all three of these tests hit the 800lb mark I will need to redo the procedure with smaller bricks.
Ditra Shear Testing - Failure point 1470 pounds
Ditra took the same setup as the SpiderWeb 2 and then some. We started filming right at this point and my guy jumped when the cans fell. The splash was epic! I'm upset we lost that footage but I'm sure we will see more. Ditra let go at 1470 pounds.
The brick pulling the waffles right out of the Ditra and ripping the Ditra much the same way Spider Web2 failed.
So head to head with Ditra Spider Web 2 is in second place in the Shear Testing set-up.
Ardex AF 207 Shear Testing Report
So the Ardex AF207 was not in the same league as Laticrete 254 when it came to strength or shear ratings.
The Ditra sample failed at only 800 pounds. The Spider Web sample failed at 250 pounds and the entire sheet pulled away. There are two observations I'll make with these last two tests.
1). The Ditra sample looked like I could have had a hair more adhesive installed.
2). The Spider Web sample clearly had too much adhesive installed.
I'm going to give the AF207 one more shot and try sampling a larger selection of trowel sizes. The fact that my tests showed Laticrete 254 being twice has strong as AF207 in shear testing is not surprising to me. I never thought a glue would be as good. Some times things that sound to good to be true - are just that.
The Spider Web 2 was on the right.
too much adhesive. I do not think the AF 207 is compatible with the spider web design.
This is just before the Ditra and AF207 failed. When we set up the rig and placed only 1/3 of can of water in the rig just fell.
I'll work out the shear strength today in pounds per square inch. Clearly Ditra won this test and it's apparent that a premium thin-set like Laticrete's 254 is superior in shear strength testing vs Ardex's new AF 207.
Double Checking the weighting system
I'll go and double check this morning. I'll weigh all the rigging and measure the weight exact. I'm pretty sure I counted every ten pound bucket going in and left my count on the side. If I missed a round I'll know this morning.
Originally Posted by nukeman
We need to do some driving today so I will crunch the math en-route and report back.