WATERPROOFING CERTAINTY FOR BUILDERS

HOW TO

Sika® BlackSeal® Elastic

CORRECTLYAPPLYTHE BUILDER-FRIENDLY BRUSH-ON WATERPROOFINGFAST DRYING · 50+ YEARS DURABILITY BRANZ APPRAISED · ELASTIC, NOT BRITTLE

A bolster, hammer, grinder, rubbingblock, a dusting brush, patchingmortar, Sika BlackSeal 1 sealant andan applicator gun, masking tape, boxcutter, spatulas, gloves, a good qualitybrush, clean water, a couple ofbuckets … and a 20 litre pail ofSika BlackSeal Elastic

And remember to always wear yourprotective gear, including glasses andgloves.

SIKA® BLACKSEAL® ELASTICTOOLS NEEDED

SIKA NEW ZEALAND

Like most building jobs, it’s all in theprep. Take a bit of time to prep thewall properly and you’ll have noproblems.

The first thing you need to do is getrid of any “dags” so you have got agood clean surface to seal on. Have achat to your blocky beforehand so heleaves you with flush pointed mortarjoints and no holes.

Remove any waste mortar from thebottom to expose the footing as well.

SIKA® BLACKSEAL® ELASTICPREPARING THE WALL

SIKA NEW ZEALAND

Then smooth the blocks down witheither a rubbing stone, or a piece ofconcrete block will do.

You need a clean dust free surface sonext give the wall a brush down. Or ifit’s really dirty, wash it with cleanwater.

SIKA® BLACKSEAL® ELASTICPREPARING THE WALL

SIKA NEW ZEALAND

If there are any gaps in the mortar,you need to fill those in too youwant a smooth clean surface to workwith.

Put a bit of mortar mix on a spatulaand press it into any gaps or holes youfind. Remember if you don’t take thetime to do this prep properly, youwon’t get a watertight wall.

SIKA® BLACKSEAL® ELASTICFLUSHING

SIKA NEW ZEALAND

Once the holes have been filled, giveit time to dry, then use your rubbingstone to smooth off the repairedareas.

SIKA® BLACKSEAL® ELASTICFLUSHING

SIKA NEW ZEALAND

Now you’ve cleaned the wall, youneed to make sure the footing isexposed.

If the block work has been laid backfrom the edge of the footing asshown here, it’s very important toinstall a triangular fillet of mortar toallow water to run off to the drain coilrather than pooling at the base of theblocks.

SIKA® BLACKSEAL® ELASTICFOOTINGS

SIKA NEW ZEALAND

Wherever you have an external sharpcorner, you need to knock that sharpedge off because just like paint,Sika BlackSeal Elastic won’t sealproperly over a sharp corner. Youneed to chamfer it and a grinder isthe fast, easy way to do the job.

Use the grinder to take any sharpedges off the footings too.

SIKA® BLACKSEAL® ELASTICCORNERS & EDGES

SIKA NEW ZEALAND

As a final touch, use your rubbingstone to knock any remaining sharpareas off, and then give the wall afinal clean.

SIKA® BLACKSEAL® ELASTICCORNERS & EDGES

SIKA NEW ZEALAND

If your wall has a control joint, give ita clean out with the grinder toremove any dags and sharp edges,give it a quick brush, then insert aSika PEF Backing Rod to fit snuggly inthe joint to a depth of at least 10millimetres. This provides a solid baseso the joint can be filled correctly.

For a professional finish, mask offboth sides of the control joint to keepthe block work clean and tidy.

SIKA® BLACKSEAL® ELASTICJOINTS & PIPES

SIKA NEW ZEALAND

To seal the joint, use Sika BlackSeal 1.It’s a bitumen based sealantspecifically for sealing joints underSika BlackSeal Elastic, or any otherbitumen based products.

Apply the sealant from the bottomup. Then work the sealant hard intothe joint to fill any gaps and get thebest adhesion. It’s important toremove the masking tapeimmediately before a skin startsforming so you get a clean, smoothfinish.

SIKA® BLACKSEAL® ELASTICJOINTS & PIPES

SIKA NEW ZEALAND

If you have a pipe protruding from thewall, it needs to be sealed off too. Fillthe gap with a length of Sika PEFBacking Rod to a depth of at least 10millimetres.

Then apply a bead of Sika BlackSeal 1.Tool off the sealant immediatelybefore a skin forms.

SIKA® BLACKSEAL® ELASTICJOINTS & PIPES

SIKA NEW ZEALAND

Make sure you’re wearing gloves fromhere on.

Give Sika BlackSeal Elastic a good mixusing a drill.

The primer coat is simply a 50/50 mixof Sika BlackSeal Elastic and clean,fresh water. One part water into aclean spare bucket. Then one partSika BlackSeal Elastic. Give it a goodmix and you’re ready.

SIKA® BLACKSEAL® ELASTICMIXING THE PRIMER

SIKA NEW ZEALAND

A good quality soft bristle brush iscrucial to doing a good job.

Apply the primer evenly, working itwell into the pores of the block workand remembering not to leave anysmall un primed areas.

SIKA® BLACKSEAL® ELASTICPRIMER APPLICATION

SIKA NEW ZEALAND

It’s a good idea to leave the lid on thepail when you’re priming andbetween coats. This helps ensure thesurface doesn’t skin and it stays fluidand easy to apply.

When you apply the first coat ofSika BlackSeal Elastic, make sure it isapplied in a uniform criss crossmanner then laying it off in a uniformhorizontal direction as you go.

SIKA® BLACKSEAL® ELASTICAPPLICATION, FIRST COAT

SIKA NEW ZEALAND

The correct application rate is2m² per litre per coat.

Allow at least 4 hours for the first coatto dry. It’s important the first coat isdry so don’t rush things at this stage.

SIKA® BLACKSEAL® ELASTICAPPLICATION, FIRST COAT

SIKA NEW ZEALAND

On the second coat, apply it in thesame criss cross manner to ensurecomplete coverage (remember2m² per litre per coat), but this timelay it off in a uniform verticaldirection as you go.

As it dries, it turns from a darkmushroom colour to its final solidblack appearance.

Wash out brush in clean water andit’s ready for the next job.

SIKA® BLACKSEAL® ELASTICAPPLICATION, SECOND COAT

SIKA NEW ZEALAND

Once the Sika BlackSeal Elastic hasfully dried, and within 48 hours, youwill need to protect it from UVexposure and any backfill damage,with Sika Protection Sheets.

Make sure the dimples on theSika Protection Sheets are facing in.This ensures any water will flow easilydown to the drainage coil at thebottom. Trim the sheets to fit.

SIKA® BLACKSEAL® ELASTICPROTECTION SHEET APPLICATION

SIKA NEW ZEALAND

A minimum 100 mil diameterdrainage coil must be installed at thebase of the footing and covered witha geotextile fabric.

The drain coil must have a minimumfall of 1 to 200 and discharge to anapproved drainage outlet.

Backfilling should be done with asuitable granular, free drainingmaterial such as scoria.

SIKA® BLACKSEAL® ELASTICCORRECT DRAINAGE

SIKA NEW ZEALAND

1)Watchtheonline“HowtoApply”videoEitherscanthecodeonthispageorvisitlearnhow.sika.co.nz

2)CompletetheshortbuilderfriendlyquizIt’sonthatsamewebpage

3)FillinyourdetailsincludingyourLBPnumber,anddownloadapersonalised,readytoprintLBPexclusiveSikaCertificateItwillincludeyournameandLBPnumberandisreassuringprooftoyourclientsthatyouare100%uptospeedonbelowground,residentialwaterproofing.

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‘HowtoApplyCorrectly’video