Bitumen Water Proofing

7/29/2019 Bitumen Water Proofing

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Water ProofingWater Proofing

Flat RoofsFlat Roofs

byby

Modified BituminModified Bitumin

MembraneMembrane

ByP.J.Sharma,DEN/GHY & K.K.Goswami,DyC


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NecessityNecessity

Conventional methodsConventional methodsWhy this method?Why this method?

What is Modified BituminoWhat is Modified Bitumino

waterproofing membranewaterproofing membrane

EconomicsEconomics

Structural propertiesStructural properties

Sequence of operationSequence of operation

PrecautionsPrecautions

ConclusionConclusion


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NECESSITYNECESSITY


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Conventional methoConventional metho

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$*$*

++


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Why Modified Bituminous Watehy Modified Bituminous Wate

Membrane?Membrane?

Proved efficacy of water proofingProved efficacy of water proofing

Aesthetic advantageAesthetic advantage

Easy applicabilityEasy applicability

Excellent structural property,rot prooExcellent structural property,rot proo

Cheap in long term economicsCheap in long term economics

Best suited to high rainfall regions liBest suited to high rainfall regions li

ER & westernER & western ghatghat. In. In LumdingLumding div.div.seasons passed without problem afseasons passed without problem af

this method.this method.


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What is Modified BitumWhat is Modified Bitum

waterproofing membrwaterproofing membr

Manufactured from rich bitumen &Manufactured from rich bitumen &polymer blended together to obtapolymer blended together to obtaexcellent heat resistance & coldexcellent heat resistance & cold

temperature flexibility.temperature flexibility.Polymer modified bitumen is thenPolymer modified bitumen is thenon to a dimensionally stable nonon to a dimensionally stable non--wwpolyester/polyester/fibrefibre glass to obtain higglass to obtain hig

strength, tear & puncture resistanstrength, tear & puncture resistanhighly resistant to substrate movehighly resistant to substrate move


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Modified Bitumen waterproofing Modified Bitumen waterproofing

rollsrolls


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EconomicsEconomics

Long term good performance.Long term good performance.( 10 years manufacturers guaran( 10 years manufacturers guaran

Cost nominal if aesthetic, usabilitCost nominal if aesthetic, usabilit( Terrace remains accessible) co( Terrace remains accessible) co

Easy availability in markets.Easy availability in markets.


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Structural propertieStructural propertie

No floNo floHeat resistanceHeat resistance

Less Less Water absorption (%)Water absorption (%)

No leNo leResistance to water pressureResistance to water pressure

150/1150/1Tear resistance (L/T)NTear resistance (L/T)N

MoreMoreLap joint strength(L/T)N/5cmLap joint strength(L/T)N/5cm

150150Softening point, deg CSoftening point, deg C

10x110x1Roll size, MRoll size, M

44Thickness of Membrane, mmThickness of Membrane, mm

5050Roll weight, KGRoll weight, KG

160g/160g/Carrier weight,Carrier weight,

1515--2525Penetration at 25 deg CPenetration at 25 deg C dmmdmm

700/5700/5Tensile strength (L/T) N/5cmTensile strength (L/T) N/5cm

4040--5050Elongation at Break (L/T)%Elongation at Break (L/T)%


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Sequence of operaSequence of operat

The concrete surface shall be cleaneThe concrete surface shall be cleanethoroughly of all laitance, loose particthoroughly of all laitance, loose particetcetc

Existing substrate treated with any oExisting substrate treated with any o

waterproofing method like limewaterproofing method like lime surkhsurkhbe dismantled & surface to be modifiebe dismantled & surface to be modifiepolymer modified mortar as per manupolymer modified mortar as per manuspecifications.specifications.

Apply primer coat with solvent basedApply primer coat with solvent based primer as specified by the manufactuprimer as specified by the manufactucleaned &cleaned & levelledlevelled surface.surface.


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Prepared substrate


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Application of primer


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Sequence of operaSequence of operaUnroll the modified bitumen waterprooUnroll the modified bitumen waterproo

membrane rolls. Align the rolls correcmembrane rolls. Align the rolls correcit in alignment before torching.it in alignment before torching.

Use gas burner to heat substrate & unUse gas burner to heat substrate & un

softening points. When the embossingsoftening points. When the embossing

disappears, roll forward & press firmlydisappears, roll forward & press firmlysubstrate to bond from the lower end substrate to bond from the lower end

higher end.higher end.

Keep overlap margin for minimum 80Keep overlap margin for minimum 80

longitudinal & 150 mm in transverse dlongitudinal & 150 mm in transverse d

The treatment of the horizontal surfacThe treatment of the horizontal surfac

continued to the vertical side wall.continued to the vertical side wall.


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Aligning the rolls


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Heating the substrate & underside of roll to s


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Heating the substrate & underside of roll to s


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Sequence of operSequence of opera

Heat both the overlaps & use rouHeat both the overlaps & use rou

trowel to seal overlap. Excess cotrowel to seal overlap. Excess co

should be smoothened & presseshould be smoothened & presse

seam using hot trowel.seam using hot trowel.All angles &All angles & upstandsupstands should be should be

with extra care to ensure the perwith extra care to ensure the per

bondage. Seal the edges well intbondage. Seal the edges well int

& protect with a& protect with a PolysulphidePolysulphide seasea


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Sealing theoverlaps


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Treated surface


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Sequence of operaSequence of operatFor nonFor non--foot traffic area, applyfoot traffic area, apply alal

paint over the treated surface.paint over the treated surface.

For foot traffic area, overlay with For foot traffic area, overlay with

thick concrete screed of 1:2:4 (Bythick concrete screed of 1:2:4 (By

with 10mm & down well gradedwith 10mm & down well gradedaggregates & concrete should beaggregates & concrete should be

with a normal admixture as per thwith a normal admixture as per th

direction of manufacturer.direction of manufacturer.

The concrete shall be cured with The concrete shall be cured with atleastatleast 7 days.7 days.


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PrecautionsPrecautionsSurface preparation is extremely imSurface preparation is extremely im

Slope of substrate has to be correcSlope of substrate has to be correc

minutest detail, standing water is hminutest detail, standing water is h

WorkmanshipWorkmanship.over burning,unde.over burning,unde

to be avoided.to be avoided.

No wetness during fixing.No wetness during fixing.


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ConclusionConclusion

This method takes advantage of tThis method takes advantage of trevolution of polymer science to prevolution of polymer science to p

high strength , non degradable,high strength , non degradable,

impermeable character to traditioimpermeable character to tradition

bituminous overlaybituminous overlayNo glue fixing, but torch burning gNo glue fixing, but torch burning g

permanent bond with substrate.permanent bond with substrate.

Hence this method can be effectivHence this method can be effectiv

adopted in all areas for waterprooadopted in all areas for waterproo


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Bitumen Water Proofing

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