We now carry a variety of dump truck tarping systems

How to install our liners

Tools Needed:

  • Tape Measure
  • Drill
  • 3/8" & 5/16" Drill Bit
  • Chalk Line
  • Cargo Jacks
  • Ratchet Straps
  • Circular Saw
  • Aluminum / Steel Welder
  • 8 Clamps or Vise Grips
  • 2 Wrenches

Installation Instructions

  1. Unroll polyliner with curl down. This is VERY important. Let polyliner sit in the sun or a heated shop as long as possible, at least 3 hours. Of course, the longer it sits out, the better it will lay flat.
  2. Cut to length, 1/2" short of tailgate for every 10 feet of liner.
  3. We DO NOT recommend scoring, it makes the liner weak in that spot. If you want to score it, measure each trailer. They are all a little different. For example, if a trailer has 80" of flat, and then a 5" 45 degree angle clean out, snap your chalk line at 80" and 85" and put 2 scores on each side of the 80" mark 1/8" apart. Set the circular saw with a brand new carbide blade at 1/4" the thickness of the liner on 1/2", 3/8" and 1/4" liners for the depth.
  4. Measure "dog house" hoist enclosure and make sure it is centered. Some of them are not. If it measures 4 feet X 1 foot, cut the one foot wide so the tongue of the liner can be put on the back of the "dog house."
  5. For every 8 foot of liner, use a nylon strap come-a-long to get the liner into horseshoe shape.
  6. A 120" liner goes 60" to the left and 60" to the right from the center of trailer; then snap a chalk line at 63 3/4" from center of trailer. That is where the top of the double angle aluminum cover strip is going to be secured. That way you don't have to push the liner the last 1 1/4" into the corners.
  7. Slide liner in trailer all the way to the front. Undo straps and press liner into corners or use cargo jacks, or what we feel works best is a flame thrower to heat up scores to 100 degrees, and then press into the corners.
  8. Slide a 2" x 3/8" flat bar all the way to front of box and then back it up one inch. Drill 5-3/8" holes equally spaced on each side of "dog house" and two behind. Draw 12-3/8" grade 5 bolts down very tight. Now you have approximately 80" of hold down strength. When liner is tight in corner or radius, set caps on liner, raise up one inch and bolt, weld, or screw to side of trailer or put double angle aluminum cap on 63 3/4" line. (Refer to Paragraph 6)

Please feel free to call for more tips!

Congratulations on the purchase of your polyliner.

45 Degree Angle in Ten Foot Installation

45 degree installation
Figure #1: Score 1/4 the depth of the liner. Scores appear
deeper in picture. Scores have to be on top.

Use a flame thrower or weed burner to warm and form a nice smooth slippery radius. This is the best procedure and leaves no score.

To install ten foot wide polyliner, slit the front for the dog house and slide all the way to the front and put 2" by 3/8" flat bar down on both sides of the dog house leaving 1" behind bulk head (refer to figure #6). Drill 5-3/8 holes equally spaced on each side. Tighten bolts and secure dog house strip with two 3/8 bolts. Then take six cargo jacks and jack the poly in the corners making a nice, smooth, slippery radius. Bolt, weld, or screw caps in place.

Jacks are used mainly for 3/8 and 1/2 inch thicknesses. If you do score it has to be on top, as shown in picture. Score 1/4 the depth of liner. Use four scores, place them 1/8" apart by each bend and there will be a total of sixteen scores.

Radius On Sides of Ten Foot Installation

90 degree installation
Figure #2: If you do score, score 1/4 depth of liner as shown.
One score every 3". Scores have to be on top.

Use a flame thrower or weed burner to warm and form a nice smooth slippery radius. This is the best procedure and leaves no score.

To install ten foot wide polyliner, slit the front for the dog house and slide all the way to the front and put 2" by 3/8" flat bar down on both sides of the dog house leaving 1" behind bulk head (refer to figure #6). Drill 5-3/8" holes equally spaced on each side. Tighten bolts and secure dog house strip with two 3/8" bolts. Then take six cargo jacks and jack the poly in the radius making a nice, smooth, slippery radius. Bolt, weld, or screw caps in place.

Jacks are used mainly for 3/8 and 1/2 inch thicknesses. If you do score it has to be on top, as shown in picture. Score 1/4 the depth of liner. Use six scores, place them 3" apart. Scores aren't necessary on the radius, especially if you warm up sides or use six cargo jacks.

Steel and Aluminum Capping

We sell aluminum or steel single angle capping and double angle capping.

Welded cap
Figure #3: Single Angle.
3/16" Aluminum
Bolted cap
Figure #4: Double Angle.
3/16" Steel

8 and 10 foot wide liners

Unroll with curl down
Figure #5
Place 5 self-tapping screws or bolts along each side of doghouse
Figure #6

The most important thing to remember is to unroll with the curl down.

To install 8 and 10 foot wide, leave width alone. Simply slit the front for the doghouse and put 2" x 3/8" flat bar on both sides of doghouse leaving 1 inch back of bulkhead. Drill five 3/8" holes equally spaced on each side. Tighten 3/8" grade 5 bolts and secure doghouse strips with two 3/8" bolts.

Side Installation

Hang poly on left side like a curtain. Secure with three small screws in the front, middle, and back. Then cap with lightest weight 2" angle iron. Drill and tighten 5/16" bolts every 2 feet.

Hang side like a curtain
 
Figure #7
Bolt every 2 feet
 
Figure #8
View from the back of the box
Figure #9: End View