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6 Mil Polyethylene Sheet - Very wide

Polyethylene sheet reinforced wide 

It is highly desirable to avoid having to join polyethylene sheets because it is a lot of effort and tape to keep the water out.  It is much better to obtain a polyethylene sheet that is big enough to not need joins.

It is good to find a sheet that is resistant to tears and punctures.

It is good to have some elasticity so that it stretches a bit and keeps providing a water proof membrane if there is movement, rather than tearing.

It is desirable to have a polyethylene sheet that is marked in a checkerboard pattern so that you can keep it aligned as it goes into the footing trenches.

6 mil is the minimum thickness, but thicker eg 10 mil would be even better if it's affordable.

http://www.americover.com/6_mil_reinforced_clear_683_prd1.htm

60 foot wide $450 for 100' roll.  String reinforced, so it will stretch a little without tearing.

They can do custom widths wider than 60'.  I need about 75 foot wide (13+15+32+15=75).  The length I need is 120 feet (13+15+60+15+12=115) (Need to recalculate these dimensions prior to ordering.)

PSR6CC-78’x120’.  $636.48 .  Weight is 270 lbs.  About $640 + $140 shipping (from near San Diego).

Spec:  http://www.americover.com/images_templ/link/Americover_PSR_6CC.pdf