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Layfield Guide Specifications Section 33 47

September 2009 RPE GEOMEMBRANE

Layfield Environmental Systems Page

Part 1General


.1Reinforced Polyethylene (RPE) geomembrane


.1Section 31 22 13 - Rough Grading

.2Section 31 23 23 – Backfilling


.1ASTM D751 – Standard Test Method for Coated Fabrics

.2ASTM D2136 – Standard Test Method for Coated Fabrics-Low-Temperature Bend Test

.3ASTM D2261 – Standard Test Method for Tearing Strength of Fabrics by the Tongue (Single Rip) Procedure (Constant-Rate-of-Extension Tensile Testing Machine)

.4ASTM D4437 – Standard Practice for Determining the Integrity of Field Seams Used in Joining Flexible Polymeric Sheet Geomembranes.

.5ASTM D4759 – Standard Practice for Determining the Specification Conformance of Geosynthetics

.6ASTM D5034 – Standard Test Method for Breaking Strength and Elongation of Textile Fabrics (Grab Test).

.7ASTM D5641 – Standard Practice for Geomembrane Seam Evaluation by Vacuum Chamber



.1Contain the following chemical(s)

.1[ ]

.2Remain flexible throughout service life

.3Highly resistant to UV degradation


.1Section 01 33 00; Submission Procedures

.2Product Data:

.1Provide specification sheets for geomembrane

.2Provide mill test reports for geomembrane roll stock used to make liner

.3Provide shop test reports for each fabricated panel produced

.4Provide field test reports for all welds completed in the field


.1Geomembrane manufacturer to be ISO 9001 registered.

.2Fabricator to be ISO 9001 registered or follows ISO 9001 compliant procedures.

.3Installer to follow documented installation plan and work procedures.

Part 2Products



.2Geomembrane material
[RPE 15] [RPE 25] [RPE-Oil Resistant]

.1Nominal Thickness (ASTM D 5199):
<[0.30] [0.51] [0.60] mm> <<[0.012] [0.020] [0.024] inches>>.

.2Typical Tensile Properties (ASTM D5034/ASTM D751): Machine direction and perpendicular to machine direction average values on the basis of five (5) test specimens each direction:

.1Break Strength: <[933x801] [1510x1510] [1600x1600] N> <<[210x180] [340x340] [360x360] lb>>.
.2Break Elongation (Typical): 15%.

.3Typical Tear Strength (ASTM D2261): Machine direction and perpendicular to machine direction average values on the basis of five (5) test specimens each direction:

.1 Minimum Tear Resistance:
<[311x311] [560x560] [400x400] N> <<[70x70] [125x125] [90x90] lb>>.

.4Typical Burst Resistance (ASTM D3786):
<[2553] [3800] [4200] kPa> <<[370] [551] [609] psi>>.

.5Low Temperature Bend (ASTM D2136): <[-55] °C><<[-67] °F>>.

.6UV Resistance (G53-84): 2000 hour test

.1Strength retained,
.1<[80] [80] [80]%>

.7Minimum Shop Seam Properties (ASTM D6693):

.1Shear Strength: <[15.8] [21] [21] kN/m> <<[90] [120] [120]lb/in>>.
.2Peel Strength: <[FTB] [FTB] [FTB].


.1Layfield Geosynthetics and Industrial Fabrics Ltd., or; Layfield Plastics Inc. or;
An approved fabricator of Layfield products.


.1Set Up

.1Carefully transfer rolls of geomembrane from storage to unwinding rack.

.2The floor or table must be clean, dry, and free of foreign objects that could damage the liner.

.3Pull panels to specified length, after double-checking dimensions on the work order.

.4Ensure seaming equipment is in good repair and functioning properly. Ensure equipment is adjusted to the material.

.5Follow documented welding procedures.

.2Qualification Seam

.1A qualification seam will be run prior to any fabrication.

.2The qualification seam must be run using the same material and equipment that will be used for fabrication.

.3Machine conditions and operator used for fabrication must be the same as those used for the qualification weld.

.4Qualification seam must be tested in shear and peel and meet the specified requirements for the material as stated in the materials section.

.5A qualification seam must be rerun whenever the operator is changed, the equipment adjusted, shift changed, or if the equipment is idle for more than 2 hours.

.3Fabrication Seams

.1Fabrication seams must meet the specified requirements in peel and shear for the material.

.2Fabrication seams will be destructively tested in shear and peel according to ASTM D6392.

.1Test one specimen each in peel and shear on the first and last welded panel, and,
.2Test one specimen each in peel and shear for every <300 lineal meters> <<1000 lineal feet>> of welding

.3A record of the seam test results is maintained on the Shop QC report.

.4The seaming process must be constantly supervised by the equipment operator. 100 % of the fabrication seams must be visually inspected during seaming.

.4Protection from Damage

.1Protect completed panels from damage

.2Handle carefully to avoid damaging the liner


.1Each panel will be accordion folded in one direction, and rolled or folded in the other direction.

.2Wrap completed panels in a weather resistant, opaque cover material.

.3Hold wrapper securely in place using UV resistant tape or other secure method.

.4Label the packaged liner to clearly show:

.1Material type
.3Stock code
.4Sales order number
.5QC number
.6Panel number
.7Unfolding and deployment directions



.1Completed panels will be placed on clean, serviceable pallets, free from exposed nails or other obstructions.

.2A layer of geomembrane, geotextile, or wood will be placed on all pallets to protect the panel from damage.

.3Secure panels to the pallet using metal or plastic bands. Use a layer of geomembrane between the packaged liner and the band to prevent damage to the liner as the band is tightened.

.4The packaged liner must not extend beyond the outer edges of the pallet. Use larger pallets or a layer of plywood to extend the pallet edges to match the liner.

.5Carefully handle and place on the truck to avoid damage to the liner.

.6[Do not stack panels] [Panels may be stacked not more that two high].


.1All panels will be inspected for damage on delivery.

.2Use suitable unloading equipment to handle panels. Do not drag, slide, or drop panels during unloading.

.3Place panels in a prepared area away from soft ground, standing water, or other deleterious surfaces.

.4Replace any pallets that may become damaged during shipping or handling.

.5Store liner panels in a secure area protected from extremes of heat or cold.

.6Protect panels from damage prior to use.


.1Preformed Pipe Boots vacuum formed from Enviro Liner sheet material can be attached to RPE using RPE Fab Tape.

Part 3Execution


.1Layfield Environmental Systems or An installer approved by Layfield.


.1Ensure subgrade is compacted and surface finished to not impair installed membrane.

.2Subgrade to provide firm, unyielding surface with no sharp changes or abrupt breaks in grade. A smooth drum rolled surface is preferable.

.3Ensure surfaces to be lined are smooth, free of foreign and organic material, sharp objects, or debris of any kind.

.4If a suitable sub-grade is not available then a cushion layer of [<100mm> <<4 inches>> of clean sand] [LP8 non woven geotextile] shall be placed prior to liner placement.

.5Excavate anchor trench to line, grade, and width indicated on drawings, prior to liner placement. Provide slightly rounded corners in the trench to avoid sharp bends in the geomembrane.

.6Prepare mechanical attachments according to ASTM D6497 Standard Guide for Mechanical Attachment of Geomembrane to Penetrations or Structures.

.7All concrete surfaces to which the liner will attach shall have “smooth trowel” finish. All the corners should have radius to a minimum 25mm (1 inch) as per the drawing.

.8Compaction at pipe penetrations and areas of mechanical attachment will be inspected carefully as these are areas where differential settlement can occur.

.9A certificate of subgrade acceptance will be prepared by the liner installation contractor prior to liner installation.


.1Installation of the geomembrane shall be performed in a logical sequence.

.2Place panels according to the drawings, the panel layout, and the label on each panel.

.3Sufficient thermal slack shall be incorporated during placement to ensure that harmful stresses do not occur in service.

.4Weather Conditions at Time of Installation:

.1Installation of membrane in winds above <20 km/h> <<12 mph>> can proceed only if the installer can demonstrate that the liner will not be at risk of damage.

.2Do not install membrane during precipitation or in the presence of excessive moisture.

.3Do not install in weather conditions that may be detrimental to the function of the membrane.

.5Ensure personnel working on geomembrane do not use damaging footwear.

.6Protect completed panels from damage; handle carefully to avoid damaging the liner.

.7Equipment and methods used to unroll liner panels should not damage the prepared subgrade.

.8Ballast used to prevent uplift by wind must not damage the geomembrane. A continuous load is recommended along the edges of panels to eliminate the risk of wind uplift.

.9Field Seams

.1Field seams are prepared using RPE Fab Tape

.1Layout panels with <300 mm> <<12 inches>> of overlap
.2Clean both surfaces to be seamed and fold back top panel
.3Place a continuous strip of RPE Fab Tape on bottom panel
.4Remove release paper and place top panel
.5Apply pressure or roll seam to bond
.6Visually inspect seam to make sure that tape is continuous and fully bonded to both sides of seam
.7Backfill all seams with design backfill
.8Backfill in the direction of seam overlap to prevent backfill from opening the seam. Use a spotter ahead of the backfilling to make sure that the geomembrane is not damaged.


.1Inspect seams and non-seam areas for holes, tears, or other defects.

.2Repair all through-thickness defects.

.3Small Holes: Repair by patching with a patch and RPE Fab Tape

.4Tears: Cap area with a patch secured with RPE Fab Tape

.5Patches: Round or oval, of same geomembrane. Extend minimum <75 mm> <<3 inches>> beyond the edge of the defect.

.6Verification of Repairs: All repairs to be visually inspected.

.7Keep records of all repairs and the results of repair inspection.


.1Section 01 74 00.

.2Cleaning solvents shall not be used unless product is approved by membrane manufacturer.

.3Use water and rags for all cleaning. If soap is used for cleaning rinse with clean water and dry before welding.


.1Section 01 45 00: Protecting installed work.

.2Protect finished Work from damage. See instructions on backfilling.


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