Invisi-Fast Test Results
Below are the results of 3rd party testing by Testing Engineers, Inc. of the Invisi-Fast Hidden Deck System, Series 1 of 4.
For complete results, including Trex, Weather Best, Redwood, pressure treated Ponderosa Pinedeck deck boards, download the full report in PDF format. [3.1 Mb]
For a MSDS of the plastic material used in the Invisi-Fast Hidden Deck Fastener, click here. [48 Kb]
Sample Description
Each test assembly consisted of two (2) 30" long joist simulators (nominal 2"x6") attached to two (2) 18" long deck boards secured to the joists with six (6) "Invisi-Fast Hidden Deck Fasteners". The joists for all tests were pressure treated Ponderosa Pine spaced at 16" on center. Each bracket was installed per the manufacturer's recommendation i.e. one (1) screw in the center hold for the joist connection and two (2) screws for the deck board were applicable (see below photos). Screws for assembly were coated 1-1/4" long x 0.170" thread O.D. x 0.112" root diameter.
Procedure
The joists of each test assembly were placed on wood supports on the bed of the test machine. An axial compressive load was applied to the center of underside of the deck board using a 10" x 10" x 1" thick bearing plate and swivel-head load applicator. The direction of loading simulates an up-lift force on the deck boards. Dial indicators accurate to 0.001" were placed on each end of the bearing plate and measured vertical movement of the deck boards with respect to the joist. Displacement was recorded at 100-pound intervals until failure. Loading was applied at a 0.035" per /min until failure. Test description and results are presented in following Tables.
Series 1: (2) 2 x 6 x 30" pressure treated Ponderosa Pine Joists (SG=.43) with LP. Weather Best deck board (SG = 1.0) using the Invisi-Fast bracket with 3/16" spacer.
Sample #1
| Load (lbs.) |
Displacement (in.) |
|
| 0 |
0 |
0 |
| 100 |
0.006 |
0.007 |
| 200 |
0.011 |
0.013 |
| 300 |
0.023 |
0.025 |
| 400 |
0.048 |
0.045 |
| 500 |
0.087 |
0.070 |
| 600 |
0.145 |
0.100 |
| 700 |
0.195 |
0.130 |
| 800 |
0.245 |
0.160 |
| 900 |
0.305 |
0.216 |
| 1000 |
0.345 |
0.260 |
| 1100 |
0.390 |
0.295 |
| 1200 |
0.430 |
0.330 |
| 1300 |
0.480 |
0.360 |
| 1400 |
0.535 |
0.400 |
|
 Ultimate Load = 1521 lbs.
FailureMode: Screws pulled from joist.
Pounds per square foot [1521 lbs/1.277 sq. ft (1.333'x0.958')] = 1191PSF / 3 safety factor = 397 PSF
|
Sample #2
| Load (lbs.) |
Displacement (in.) |
|
| 0 |
0 |
0 |
| 100 |
0.008 |
0.019 |
| 200 |
0.013 |
0.027 |
| 300 |
0.021 |
0.047 |
| 400 |
0.040 |
0.055 |
| 500 |
0.068 |
0.080 |
| 600 |
0.105 |
0.110 |
| 700 |
0.150 |
0.145 |
| 800 |
0.195 |
0.195 |
| 900 |
0.235 |
0.240 |
| 1000 |
0.270 |
0.280 |
| 1100 |
0.305 |
0.310 |
| 1200 |
0.345 |
0.350 |
| 1300 |
0.390 |
0.385 |
| 1400 |
0.425 |
0.420 |
| 1500 |
0.510 |
0.480 |
|
 Ultimate Load = 1532 lbs.
FailureMode: Screws pulled from joist.
Pounds per square foot [1532 lbs/1.277 sq. ft (1.333'x0.958')] = 1200PSF / 3 safety factor = 400 PSF
|
Sample #3
| Load (lbs.) |
Displacement (in.) |
|
| 0 |
0 |
0 |
| 100 |
0.006 |
0.007 |
| 200 |
0.015 |
0.020 |
| 300 |
0.025 |
0.030 |
| 400 |
0.035 |
0.045 |
| 500 |
0.055 |
0.060 |
| 600 |
0.080 |
0.085 |
| 700 |
0.110 |
0.115 |
| 800 |
0.145 |
0.153 |
| 900 |
0.190 |
0.195 |
| 1000 |
0.210 |
0.230 |
| 1100 |
0.250 |
0.265 |
| 1200 |
0.280 |
0.315 |
|
 Ultimate Load = 1302 lbs.
FailureMode: Screws pulled from joist.
Pounds per square foot [1302 lbs/1.277 sq. ft (1.333'x0.958')] = 1020PSF / 3 safety factor = 340 PSF
|
Sample #4
| Load (lbs.) |
Displacement (in.) |
|
| 0 |
0 |
0 |
| 100 |
0.004 |
0.009 |
| 200 |
0.008 |
0.015 |
| 300 |
0.018 |
0.025 |
| 400 |
0.035 |
0.041 |
| 500 |
0.058 |
0.062 |
| 600 |
0.081 |
0.093 |
| 700 |
0.110 |
0.125 |
| 800 |
0.152 |
0.163 |
| 900 |
0.180 |
0.200 |
| 1000 |
0.210 |
0.235 |
| 1100 |
0.255 |
0.280 |
| 1200 |
0.290 |
0.322 |
| 1300 |
0.380 |
0.390 |
|
 Ultimate Load = 1501 lbs.
FailureMode: Screws pulled from joist.
Pounds per square foot [1501 lbs/1.277 sq. ft (1.333'x0.958')] = 1175PSF / 3 safety factor = 392 PSF
|
Series 1 Average Uplift: 382 PSF
For complete results, including Trex, Weather Best, Redwood, pressure treated Ponderosa Pinedeck deck boards, download the full report in PDF format. [3.1 Mb]
