EasyLay™ UDL 15

EasyLay UDL 15LeakBarrier EasyLay UDL 15 is a value-priced synthetic roof underlayment that has good resistance to the elements. The material consists of a woven polymeric scrim that imparts strength, and a textured fabric on the upper surface that provides walkability.   


EasyLay UDL 15 is designed as an alternative to asphalt saturated felt and can be used in conjunction with shingle, shake, slate and metal. It can be mechanically attached to several substrates, and used in new and re-roofing applications.

Features and Benefits

  • Lightweight; Less than 2.5 lbs per square
  • Can be left exposed for up to three months
  • More coverage per roll than traditional felt
  • Good pliability and low temperature flexibility
  • Pre-printed lay lines for easy installation
  • Algae, fungi, and mold resistant; does not rot or decay
  • 100% recyclable
  • Meets and/or exceeds ASTM D226 Type I and II
  • Florida Building Code Approval FL #16884
  • Texas Department of Insurance (TDI) approved


  • EasyLay UDL 15 must be stored in a dry location.
  • Rolls must be stored on pallets and not more than one pallet high.
  • Do not store rolls in direct sunlight.

General Precautions

  • EasyLay UDL 15 shall be installed in strict compliance with applicable Building Code.
  • Follow Occupational Safety and Health Administration (OSHA) safety standards; use common sense measures and adequate precautions to prevent accidents.
  • EasyLay UDL 15 is considered a vapor barrier.  Proper ventilation is critical.  Ensure installation does not interfere with existing ventilation.  
  • EasyLay UDL 15 shall not be torched or hot mopped to.
  • On slopes less than 4:12, a double layer of EasyLay UDL 15 is recommended.  Double layer application is best achieved by using 24" side laps, making sure the side laps are “shingled in” to shed water.
  • Ensure that sharp objects such as debris, stones, bricks, etc. are not dropped on to the EasyLay UDL 15 surface so as to avoid possible cuts or tears. 
  • When tin tags/caps are used to secure EasyLay UDL 15, the material shall be covered immediately after application with an approved underlayment or a suitable roof covering.
  • The use of staples to attach EasyLay UDL 15 is not permitted.
  • Apply a thin coat of asphalt-based roofing cement to areas of EasyLay UDL 15 with any cuts or tears.
  • Do not use staples to attach EasyLay UDL 15.  Use of staples will void the warranty.
  • EasyLay UDL 15 is not intended to be used as the primary weather resistant roof covering.

Surface Preparation

  • The substrate shall be clean and dry prior to installing EasyLay UDL 15.
  • For re-roofing, all old roofing and other loose materials must be removed prior to installation.

Application Guidelines

  • Place a full width piece of EasyLay UDL 15 parallel to the eave (low) edge of the roof.
  • Unroll the material 2 to 3 feet and position the end of it to the edge of the eave and rake.
  • Install a few fasteners near the rake and roll out the sheet to a manageable length.
  • Straighten and align the sheet to eliminate any wrinkles.
  • Fasten the sheet using 3/8" headed roofing nails or 1" plastic capped nails, spaced 9" o.c. at all laps and two staggered rows fastened 12" o.c. in the field, or as per applicable Building Code.  In HVHZ jurisdictions, the sheet shall be fastened 6" o.c. at all laps and three staggered rows fastened  12" o.c. in the field of the sheet.
  • When using 1" diameter nails, apply such that the head of the nail is flush with the sheet surface, without cutting into the sheet.
  • Fasten the sheet from the top edge to avoid walking or kneeling on the unsecured portion.
  • Align the next sheet over the preceding sheet so as to form a minimum 4" side lap and 8" end lap or as per applicable Building Code.  
  • Then install the sheet as per instructions above.  Install such that the bottom of the second course is over the top of the first course so that any water will flow over the underlayment.
  • Stagger the end laps a minimum of 36" (3 feet) from the preceding course.
  • Install EasyLay UDL 15 a minimum of 6" up any vertical surfaces.
  • EasyLay UDL 15 used in valley areas must be covered with metal or other valley liners.
  • Seams or joints that require adhesive or sealant can be treated with plastic cement.
  • Flash vent pipes, stacks, chimneys, and penetrations in compliance with applicable codes.


Property Typical Values Reference Test
Tensile strength, lbf     70 ASTM D1682
Tear resistance, lbf 25  ASTM D1922
Pliability at 23°C Pass ASTM D226
Liquid water transmission Pass ASTM D4869
Water vapor transmission, perms 0.10 ASTM E96
Algae & Fungus resistance, Rank 0 – 4 0 (no growth) ASTM G21/D3273

Product Data

Product Data  
Width 48 in (1.22 m)
Length 250 ft (76.2 m)
Thickness 8 mil (nominal)
Gross Coverage 1,000 sq ft (10 sq)
Weight 22 lb (nominal)
Rolls per pallet 56


Tarco Specialty Products, Inc. offers a 20-Year Limited Material Warranty.

All statements, information and data given herein are believed to be accurate and reliable but are presented without guaranty, warranty or responsibility of any kind, expressed or implied, except as may be indicated otherwise in this literature.


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