HYDRASTOP SBW – Suspended Balcony Waterproofing Membrane

Product Data, W. R. MEADOWS

07 13 00
No. 727 Click for .PDF
Related Content:
Safety Data Sheet

Suspended Balcony Waterproofing Membranehydrastop-sbw-suspended-balcony-waterproofing-membrane

HYDRASTOP SBW is a 60 mil composite, self-adhered sheet membrane comprised of a non-woven fabric, elastomeric membrane, and coated release paper.  Once concrete is poured against HYDRASTOP SBW and the concrete cures, a mechanical bond forms that secures the concrete to the membrane.

HYDRASTOP SBW is used as a pre-applied waterproofing membrane specifically designed for horizontal suspended balcony  slabs that will receive a concrete topping.


  • Provides a waterproof seal between the membrane and poured concrete deck.
  • Helps prevent moisture migration into the structure.

37″ x 65′ (939.8 mm x 19.8 m) long rolls, one roll per carton.

Store membrane cartons on pallets and cover if left outside. Keep materials away from sparks and flames.

Surface Preparation … Inspect all surfaces for any conditions detrimental to the proper completion of the work. Surfaces should be structurally sound. Remove debris or any other foreign material that could damage the membrane.

Application Method … HYDRASTOP SBW may be applied at temperatures down to 40° F (5° C).

Remove release paper on edge, then position first roll of HYDRASTOP SBW membrane.  Pull balance of release paper off, running the roll from low to high points, so all laps will shed water.  Roll press into place with a tile-type roller.  Stagger end laps and overlap all seams at least 2.5″ (63.5 mm).  Prior to placement of overlapping roll of HYDRASTOP SBW, apply HYDRALASTIC 836 to an area 2.5″ (63.5 mm) wide in the seam overlap area, position the HYDRASTOP SBW, and roll press into place.  Remove the balance of release paper and roll press membrane into place.  Apply PRECON FABRIC TAPE from W. R. MEADOWS over construction, control, and all expansion joints and over cracks greater than 1/16″ (1.59 mm) wide prior to the application of HYDRASTOP SBW.  For cracks and joints up to 1/16″ (1.6 mm), no additional treatment is needed.  For joints >1/16″ (1.6 mm) and <1/4″ (6.4 mm), joints should be filled with BEM from W. R. MEADOWS prior to installation of HYDRASTOP SBW.  For joints >1/4″ (6.4 mm), fill with BEM and a 9″ (228.6 mm) strip of PRECON FABRIC TAPE over the joint prior to installation of  HYDRASTOP SBW.  Please contact W. R. MEADOWS for specific details regarding expansion joint installations.

End Laps … Overlap membrane 6″ (152.4 mm).  Prior to overlap, apply BEM, HYDRALASTIC 836, or MEL-ROL® LIQUID MEMBRANE (two-component) from W. R. MEADOWS in area to be lapped.  Roll press membrane into BEM, HYDRALASTIC 836, or MEL-ROL LIQUID MEMBRANE.  At terminations of membrane, apply BEM, HYDRALASTIC 836, or MEL-ROL LIQUID MEMBRANE 12″ (304.8 mm) wide centered over the termination and while still wet, embed 12″ (304.8 mm) wide DETAIL FABRIC into the HYDRALASTIC 836 or MEL-ROL LIQUID MEMBRANE and roll press into place.  Ensure that DETAIL FABRIC is centered over the termination with 6″ (152.4 mm) on each side of lap edge.  Apply additional HYDRALASTIC 836 on all terminations of DETAIL FABRIC.  Stagger end laps [6″ (152.4 mm) overlap] and overlap all side laps 2.5″ (63.5 mm).

Penetrations and Protrusions … Detail around all horizontal and vertical penetrations using BEM, HYDRALASTIC 836, or MEL-ROL LIQUID MEMBRANE (two-component) from W. R. MEADOWS.   Apply BEM, HYDRALASTIC 836, or MEL-ROL LIQUID MEMBRANE by forming a fillet around the pipe or protrusion, overlapping the fabric side of HYDRASTOP SBW and the protrusion a minimum of 2.5″ (64 mm).  If the gap between the protrusion and the membrane is greater than ½” (13 mm), apply PRECON FABRIC TAPE over uncured BEM, HYDRALASTIC 836, or MEL-ROL LIQUID MEMBRANE.  All penetration and protrusion surfaces must be clean, rust-free, and sound prior to application of BEM, HYDRALASTIC 836, or MEL-ROL LIQUID MEMBRANE.

Patching … Prior to pouring, inspect membrane for punctures or damage and repair as necessary with BEM, HYDRALASTIC 836, and/or DETAIL FABRIC.


Property Test Method HYDRASTOP SBW Results
Color   Black
Thickness ASTM D 1000 Nominally 60 Mils
Low Temp Flexibility ASTM D 1970, 180° @ -25° F (-32° C) Pass
Elongation ASTM D 412-06 > 400%
Crack Cycling ASTM C 836 @ -15° F (-26° C) Pass
Puncture Resistance ASTM E 154 260 lb. (1155 N)
Peel Adhesion to Concrete ASTM D 903 10 lb./in (1754 N/m)
Resistance to Penetration
by Termites
Texas A&M Method
Percentage of Penetration
Resistance to Penetration
by Pesticides
ASTM F 2130
Percentage of Penetration

Concrete should be poured within 60 days of membrane installation. For installations below 40° F (4° C), contact W. R. MEADOWS technical services.  When using bar supports, use those with a flat bottom.

May help contribute to LEED credits:

  • EA Credit 1: Optimize Energy Performance
  • IEQ Credit 3.1: Construction Indoor Air Quality Management Plan: During Construction
  • IEQ Credit 7.1: Thermal Comfort – Design
  • MR Credit 2: Construction Waste Management
  • MR Credit 5: Regional Materials



W. R. MEADOWS, INC. designs, manufactures, and markets high-quality building materials for today's construction professionals. Products are sold through an authorized distribution network. The family-owned and operated company focuses on product quality, exceptional service, and trusted integrity since its founding in 1926.
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