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Authorized distributor · Tanzania

HDPE waterproofing in Tanzania.

Oriental Yuhong PMH-3080 Plus, held by Sahihi Construction Chemicals in Dar es Salaam: a pre-applied membrane laid before the concrete, so that the concrete bonds to it.

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Pull it apart

The membrane, between the ground and the slab.

A labelled diagram, not to scale.

The layers, top to bottom

Poured onto the membrane, and it bonds to it.

Turned it, pulled it apart? Ask us for it.

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Why it bonds

Follow the water.

Structural concreteMembrane
Pre-appliedThe membrane is bonded to the post-cast structural concrete. There is no gap for water to travel along.
Structural concreteMembraneLeak appears here
Post-appliedWhere the waterproof layer is damaged, water channels between the membrane and the concrete, and comes through somewhere else.

Where it goes

Five places OYH uses it.

  • A cut through an underground car park, showing the membrane under the slab

    Basements and foundation slabs

    Under the slab and up the walls of a basement, bonded to the structural concrete.

    1. A · Pre-applied membrane under the slab
    2. B · Steel bar and concrete above it
    3. C · PMH sealant at details
    4. D · Embedded steel plate water stop
  • A cut through a road tunnel, showing the membrane around the lining

    Tunnels

    Fully bonded with the secondary lining, over geotextile and gaskets.

    1. A · Combined bolting and shotcrete
    2. B · Gasket and geotextile
    3. C · Pre-applied membrane
    4. D · Secondary lining
  • A cut through a subway station beside a diaphragm wall

    Subways

    Against an underground diaphragm wall, with a shotcrete levelling coat.

    1. A · Underground diaphragm wall
    2. B · Shotcrete leveling
    3. C · Geotextile and gasket
    4. D · Pre-applied membrane
  • A cut through an underground pipe gallery with its membrane

    Underground pipe galleries

    Pre-applied below and post-applied above, under a protection board.

    1. A · Pre-applied membrane
    2. B · Post-applied membrane
    3. C · Protection board
  • A cut through a building with a planted roof and its layers

    Planted roofs and podiums

    A strong membrane and lap joint, under root-resistant membrane and soil.

    1. A · Pre-applied membrane
    2. B · Root resistant waterproof membrane
    3. C · Composite drain plate
    4. D · Planting soil

How it goes down

Nine steps.

  1. 01Clean substrate
  2. 02Unpack and lay membrane
  3. 03Keep release liner on
  4. 04Apply pressure on lap
  5. 05Handle details
  6. 06Check and repair
  7. 07Complete product training
  8. 08Remove release liner
  9. 09Cast concrete

From the data sheet.

  • Long edges: dual-lap self-adhesive overlap, 80mm wide
  • Short edges: 160mm wide butt joint adhesive tape, with the end laps staggered
  • Walls: mechanical fixing every 400-600mm, within 10-20mm from the edge of the self-adhesive strip
  • Pour the concrete within 21 days after the membrane installation is completed
  • No laying in rain, snow or winds of level 5 or higher, and not below 5°C
  • Accessories: PMH-T-160 butt joint tape, PMH-T-S80 particle cover tape, PMH-S-600 sealant, PMH-T-B250D double-sided butyl tape

Specification

PMH-3080 Plus, technical data.

Thickness (mm)
1.2, 1.5
Width (m)
1.2, 2.4
Length (m)
20 or Customized
Roll size (m2/roll)
24,48 or Customized
Tensile strength (ASTM D412)
21 MPa
Elongation (ASTM D412)
500%
Puncture resistance (ASTM E154)
1000 N
Peel adhesion to concrete (ASTM D903)
1800N/m
Resistance to hydrostatic head (ASTM D5385)
71 m
Peel strength in lap (ASTM D1876)
1800N/m
Crack cycling at -23 C, 100 cycles (ASTM C1305)
No crack

The documents.

Oriental Yuhong's own documents, unaltered. The method statement is written for PMH-3080 and recommends pouring within 42 days. The data sheet for PMH-3080 Plus says 21 days: work to the data sheet of the product on your site. See also the PMH-3080 Plus page.

FAQs

HDPE waterproofing, in short.

A high density polyethylene sheet that keeps water out of a structure.

  • PMH-3080 Plus is pre-applied: laid first, with the concrete poured onto it
  • It consists of a thick HDPE film, pressure sensitive adhesive and a weather resistance granular layer

A pre-applied membrane bonds to the concrete, so water cannot travel behind it.

  • OYH lists no lateral migration of water
  • With a post-applied membrane, a damaged spot lets water channel along the gap

No. The data sheet says cold apply, no primer.

  • It can go on damp substrates without standing water

1.2 or 1.5 mm, in rolls 1.2 or 2.4 m wide and 20 m long, or customized.

  • A roll covers 24 or 48 m², or customized

Sahihi, an authorized Oriental Yuhong distributor in Dar es Salaam.

  • Send the slab area and the depth of the water table for a quotation

Related

Keep going.

HDPE waterproofing in Tanzania

Send the slab area. We will come back with a quote.

Tell us the area, the structure and the ground water. You get the roll sizes, the accessories and a written quotation from our Dar es Salaam office.

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