Product Data Sheet Show all documents
SikaProof® A+ 12

SikaProof® A+ 12

FPO sheet membrane for pre-applied fully bonded below ground waterproofing

SikaProof® A+ 12 is a polyolefin (FPO) based sheet membrane for below ground waterproofing of reinforced concrete structures. It is loose laid onto prepared substrates or formwork before fixing reinforcement and casting concrete. A special hybrid bonding layer on the membrane forms a permanent bond with the fresh concrete. Overlap joints are sealed using cold-applied tapes. The total thickness is 1.75 mm with a membrane thickness of 1.20 mm.

  • Pre-applied: Fixed before placing reinforcement and casting concrete
  • Dual bond: Mechanical and adhesive bond with fresh concrete
  • High flexibility and crack-bridging capabilities
  • No lateral water migration between the concrete structure and the membrane system
  • High watertightness tested according to various standards
  • Fully and permanently bonded to the reinforced concrete structure
  • Resistant to aggressive conditions in natural ground water and soil
  • Easy to install with fully adhered joints
  • Temporarily resistant to weathering and UV exposure during construction
  • Can be combined with other approved Sika® Waterproofing / Joint Sealing Systems
  • Excellent barrier to air, radon and methane
Product Data Sheet Show all documents

Usage

Damp-proofing, waterproofing and concrete protection for basements and other below ground concrete structures against ground water ingress. Suitable for use on:
  • Reinforced concrete base slabs
  • Reinforced concrete walls with single and double-faced formwork
  • Extension and reconstruction works
  • Prefabricated structures
 

Advantages

  • Pre-applied: Fixed before placing reinforcement and casting concrete
  • Dual bond: Mechanical and adhesive bond with fresh concrete
  • High flexibility and crack-bridging capabilities
  • No lateral water migration between the concrete structure and the membrane system
  • High watertightness tested according to various standards
  • Fully and permanently bonded to the reinforced concrete structure
  • Resistant to aggressive conditions in natural ground water and soil
  • Easy to install with fully adhered joints
  • Temporarily resistant to weathering and UV exposure during construction
  • Can be combined with other approved Sika® Waterproofing / Joint Sealing Systems
  • Excellent barrier to air, radon and methane

Packaging

Product

Roll width

Roll length

SikaProof® A+ 12

1.00 m or 2.00 m

20 m

Colour

Light yellow membrane containing a light grey bonding layer

Product Details

Sustainability / Certifications / Approvals

APPROVALS / CERTIFICATES

  • CE Marking and Declaration of Performance to EN 13967 - Flexible sheets for waterproofing - Damp proofing and basement tanking
  • Watertightness of a Surface Sealing System SikaProof® A+ 12 / SikaProof® Tape A+, WISSBAU®, Germany, No. 2018-275-1
  • Watertightness of a Surface Sealing System SikaProof® A+ 12 / SikaProof® Sandwich Tape, WISSBAU®, Germany, No. 2018-276-1
  • Watertightness of a Surface Sealing System SikaProof® A+ 12 / Thermal Jointing, WISSBAU®, Germany, No. 2019-231-1
 
Product Information

Composition / Manufacturing

Membrane Layer

Flexible Polyolefin (FPO)

Hybrid Layer

Cement modified polymer

Shelf Life

18 months shelf life from date of production

Storage Conditions

Product must be stored in original unopened and undamaged sealed packaging in dry conditions and temperatures between 5 °C (41°F) and 30 °C (86 °F). Store in a horizontal position. Do not stack pallets of the rolls on top of each other, or under pallets of any other materials during transport or storage. Always refer to packaging.

Effective Thickness

Total Thickness (=deff)

1.75 mm (-5/+10%)

Membrane Thickness

1.20 mm

Mass per unit area

1,65 kg/m2 (-5/+10 %)

(EN 1849-2)
System information

System Structure

The following system products must be used:

  • SikaProof® A+ 12 sheet membrane
  • SikaProof® Tape A+ self-adhesive tape for internal jointing
  • SikaProof® Sandwich Tape for internal jointing

Alternative products: 

  • SikaProof® Tape-150 A self-adhesive tape for internal jointing

Ancillary products:

  • Accessories and complementary products are available to provide detailing and connection solutions.
Technical Information

Resistance to Impact

882 N (no puncture)

(ASTM E154)

≥ 400 mm

(EN 12691)

Tensile Strength

Machine direction

≥ 750 N/50 mm

Cross Direction

≥ 750 N/50 mm

Load Strain

5.7 MPa

Elongation

Machine direction

≥ 1100 %

Cross direction

≥ 1100 %

>1400%

(ASTM D412)

Adhesion in Peel

≥ 2,00 N/mm

(to concrete after 28 d)

2.48 N-m

(ASTM D903)

Joint Peel Resistance

3.62 N-m

(ASTM D1876)

Joint Shear Resistance

≥ 100 N/50 mm

(EN 12317-2)

Watertightness

Pass (Method B, 24 h/60 kPa)

(EN 1928)

Pass, up to 7 bar

(ASTM D5385)

Resistance to lateral water migration

Pass, up to 7 bar

(ASTM D5385 Modified)

Accelerated Ageing in Alkaline Environment

Pass (28 d/23 °C)

(EN1847)

Pass (Method B, 24 h/60 kPa)

(EN1928)

Durability of Watertightness against Chemicals

Pass (28 d/23 °C)

(EN 1847)

Pass (Method B, 24 h)

(EN 1928)

Durability of Watertightness against Ageing

Pass (12 weeks)

(EN 1847)

Pass (Method B, 24 h/60 kPa)

(EN 1928)

Reaction to Fire

Class E

(EN 13501-1)

Application

Application Information

Ambient Air Temperature

5 °C min. / 45 °C max

Substrate Temperature

5 °C min. / 60 °C max
Application steps

EQUIPMENT

  • Tape measure
  • Marking pen
  • Razor knife
  • Scissors
  • Pressure roller
  • Clean lint-free cloth
  • Metal straight edge for cutting
  • Protective sheet for cutting

SUBSTRATE QUALITY

SikaProof® A+ 12 membrane must be applied on a sufficiently stable substrate to avoid movement during the construction works. Substrate surface must be smooth, uniform and clean. Large gaps and voids (≥ 12–15 mm) must be filled before membrane installation. Substrate can be damp or slightly wet, ponding water must be avoided. Suitable membrane fixing substrates include:

  • Concrete blinding
  • Formwork
  • Rigid thermal insulation
  • Plywood sheets / forms

Documents