6 Mil Polyethylene Sheet - Very 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.
Can make first sheet smaller than second official sheet. Make first sheet 100' x 90'. Make second sheet 100' x 120'.
This is scrim/string reinforced plastic sheeting manufactured by Raven Industries. String reinforced, so it will stretch a little without tearing. I have found it to be the best choice. You will need to order from a local distributor. Raven can provide a list of distributors.
ACF West - Dura-Skrim
David Strode ACF West 253-922-6641
102’ x 120’ @ $975.00
102’ x 90’ @ $731.25
$1,706.25 - $85 (5% discount) = 1,621 + $139 (8.6% sales tax) = $1,760
http://www.americover.com/6_mil_reinforced_clear_1220_prd1.htm 5.8 cents per sq ft
Other 6mil polyethylene