Match the Membrane to the Water Exposure

Water usually finds the detail that was easiest to overlook. Shop Sika waterproofing products for liquid-applied membranes, sheet membrane systems, moisture barriers, detailing components, protection layers & specialist accessories used across balconies, roofs, podiums, basements, retaining structures & concrete construction.

A planter box buried against soil faces a very different challenge from an exposed roof or tiled balcony. Water source, membrane exposure, substrate condition, movement, penetrations, drainage & protection all influence which waterproofing system belongs on the structure.

Different structures call for different waterproofing technologies. Sika offers Sikalastic®, Sikaplan® WP, SikaProof®, SikaSealTape® & SikaRoof® solutions spanning balcony & roof waterproofing through to basements, retaining walls, podiums & below-ground structures.

Choosing between them starts with the project itself. Consider where the water is coming from, whether the membrane will remain exposed or covered, how the substrate is prepared & which joints, penetrations, corners or terminations require dedicated detailing. For products supporting other stages of construction, explore Sika | Construction Supplies.

► Liquid-applied waterproofing membranes
► Sheet waterproofing membranes
► Below-ground waterproofing systems
► Balcony & podium waterproofing
► Roof membrane components
► Waterproofing tapes & corner details
► Membrane protection products
► Moisture barrier primers
► Control & injection accessories
► Concrete waterproofing products

What Are Sika Waterproofing Products?

Think of waterproofing as a complete barrier rather than a coating spread across the largest visible area. Different systems manage moisture using liquid-applied membranes, flexible sheets, cementitious coatings, primers, tapes, corners, protection layers or combinations of compatible components.

Sikalastic products include polyurethane, cementitious & specialist liquid-applied membrane technologies for suitable covered, exposed, above-ground & below-ground applications.

Sikaplan WP systems take a different approach, using flexible sheet membranes with purpose-designed fixing, protection, compartment & control components across specialist below-ground construction.

SikaProof systems provide another option for suitable basement & below-ground structures, with compatible detailing products used around membrane joints, connections & terminations.

Which system belongs on the project? Start with the structure, water exposure & finished build-up rather than choosing a familiar membrane first.

Where Sika Waterproofing Systems Are Used?

Balconies & Terraces

What makes a balcony detail difficult? Usually it isn't the open centre of the slab. Door thresholds, drains, wall junctions, penetrations, falls & changes in material can become the areas requiring the most attention.

Selected Sikalastic membranes provide seamless liquid-applied waterproofing across suitable balcony & terrace applications.

Where screed, tiles, pavers or another finish will cover the membrane, select a system documented for that build-up. For suitable tiled finishes following completed waterproofing, Sika | Grout & Tile Adhesives provides products for subsequent tile fixing & grouting.

Podium Decks

Large surfaces make planning more important—not less. Upstands, movement joints, drainage points, penetrations & transitions between construction materials deserve the same attention as the broad membrane area.

Selected polyurethane & spray-applied Sika membrane technologies can be used across compatible podium applications depending on substrate, exposure & complete system requirements.

Before waterproofing starts, Measuring & Leveling Tools can assist with practical checks of levels, falls & drainage direction.

Basements & Below-Ground Structures

Get a below-ground detail wrong & access becomes considerably harder once the structure is buried. Groundwater exposure, construction joints, penetrations, membrane terminations & protection against later construction activity should be resolved before backfilling.

Sikaplan WP sheet membrane systems provide options for suitable basements, tunnels & underground structures, while SikaProof technologies provide another approach to below-ground waterproofing.

Protection sheets, fixing discs, control sockets, connection pieces & injection accessories can become functional components within these specialised systems.

Retaining Walls & Foundations

A below-ground membrane has two jobs to survive: its intended exposure plus the construction sequence around it. Backfill, drainage material, soil movement & follow-on work can place physical demands on an installed waterproofing layer.

Sikalastic-777 is one Sika polyurethane membrane developed for suitable applications including retaining walls, foundations, basement walls & planter boxes.

Cracked, damaged or deteriorated concrete may require attention before the waterproofing build-up proceeds. Explore Concrete Repair & Restoration for products supporting suitable concrete repair work.

Roofs

Sunlight changes the waterproofing equation. An exposed roof membrane encounters UV, weather, temperature changes, standing water conditions, maintenance traffic & penetrations that a covered membrane may never experience.

SikaRoof liquid-applied systems combine compatible membrane & finishing technologies for suitable roofing applications.

Confirm exposure requirements for the complete system rather than assuming every waterproofing membrane can remain permanently uncovered.

Wet Areas Beneath Screeds

The best time to resolve a waterproofing detail is before another layer hides it. Wall-floor junctions, drains, penetrations, transitions & terminations should be completed deliberately before screeds or finishes cover the membrane.

Sikalastic-487 is designed for applications including under-screed wet areas, under-screed balconies, podiums & decks where the membrane remains within a non-UV-exposed build-up.

For suitable screed, mortar & cementitious work surrounding the installation, Trowels, Floats & Edgers provides purpose-matched placement & finishing tools.

Planter Boxes

Add roots to persistent moisture & the membrane faces another set of demands. Waterproofing behind soil & vegetation requires a system selected for that environment rather than simply any exterior coating.

Sikalastic-777 provides root-resistant polyurethane waterproofing for suitable planter box applications.

Drainage, substrate preparation, detailing & membrane protection still need to work together around the complete installation.

Liquid Membrane or Sheet Membrane?

There's no automatic winner. The stronger choice is the system suited to the structure, exposure, geometry & installation requirements.

Complex geometry may favour the continuity of a liquid-applied system while specialist below-ground construction can make a sheet system particularly valuable. The project conditions should decide.

Sika Waterproofing Product Selection Guide

Find the Water Source

Follow the water before choosing the membrane.

Establish whether the project faces:

► Rainfall
► Surface water
► Standing water
► Groundwater
► Rising moisture
► Wet-area use
► Soil-side moisture
► Intermittent splash
► Continuous water exposure

Rain arriving on a balcony doesn't create the same conditions as groundwater acting against a basement structure.

Identifying the exposure first can quickly eliminate unsuitable system types.

Decide Whether the Membrane Will Remain Exposed

Ask one simple question: will sunlight & weather reach the finished membrane?

A system buried beneath screed, tiles or pavers can require different characteristics from waterproofing that remains exposed on a roof.

Sikalastic-487 is intended for non-UV applications, while exposed Sika systems use products selected around weathering & UV requirements.

Don't treat a covered membrane as an exposed finish simply because the initial coating looks complete.

Assess the Substrate

Good waterproofing starts underneath the waterproofing.

Check concrete, screed, render or other approved substrates for:

► Loose material
► Laitance
► Dust
► Oil
► Existing coatings
► Surface defects
► Cracks
► Moisture
► Sharp irregularities
► Weak areas

Suitable repair, cleaning or preparation may be required before membrane installation. Confirm the substrate requirements for the selected waterproofing system before application begins.

Give Corners Their Own Plan

Broad surfaces are rarely the most complicated part of the job.

Internal corners, external corners, wall-floor junctions & upstands create changes in direction where membrane continuity requires careful detailing.

SikaSealTape components include products designed to complete compatible Sika waterproofing details around these transitions.

Use the specified component for the system rather than improvising a corner detail from leftover membrane material.

Map Every Joint & Penetration

Circle every interruption before the first broad coat goes down.

Outlets, pipes, posts, conduits, drains, anchors, joints & other penetrations interrupt an otherwise continuous waterproofed surface.

Joint construction can also require the correct backing profile before a compatible sealant is applied. Sika | Backing Rod & Foam Tapes provides backing & foam products for suitable joint detailing applications.

Confirm how each detail belongs within the selected system before completing the surrounding field area.

Check Moisture Before Priming

Dry-looking concrete doesn't automatically tell you what's happening below the surface.

Sikalastic Moisture Seal is a two-component water-based epoxy that can function as a primer & waterproof vapour barrier over suitable damp concrete or screeds before compatible Sika waterproofing membranes.

Use it according to documented substrate & system requirements rather than treating it as a universal moisture solution.

Control Liquid-Membrane Thickness

Colour coverage isn't a thickness measurement.

Liquid-applied waterproofing relies on the correct application rate, number of coats & resulting film build.

Where the selected system permits wet-film checking, measuring during application can provide useful confirmation before curing hides the opportunity.

Respect Recoat Windows

Timing between layers can matter as much as the layers themselves.

Liquid membranes, primers & top coats can have minimum & maximum overcoating periods.

Plan crew availability, weather exposure & material quantities before starting broad areas so the application sequence can remain within specified requirements.

Protect Below-Ground Membranes

The membrane isn't finished simply because application is finished.

Protection sheets & compatible components can help shield applicable membranes from following construction activity.

Plan membrane protection before backfill, drainage material or other work reaches the waterproofed surface.

Treat Sheet-Membrane Accessories as System Components

Small parts can carry important responsibilities.

Sika waterproofing systems can include specialist fixing, protection, control & connection products used within compatible sheet membrane arrangements.

Treat these products according to their defined system role rather than as interchangeable waterproofing accessories.

Plan the Finished Surface

What's going over the membrane next?

Tiles, screed, pavers, protection layers or exposed finishes can change the required waterproofing build-up.

For concrete surfaces requiring a different form of protection or finish outside the waterproofing membrane itself, explore Concrete Sealers & Coatings.

Protect the Applicator as Well as the Structure

Different chemistries call for different handling precautions.

Cementitious products, epoxies, polyurethane membranes, primers & solvent-associated materials can carry different requirements.

Read the current Safety Data Sheet before use & select PPE around the actual products, application method & site conditions.

Protective Equipment For Concrete Work provides equipment for compatible concrete preparation & construction tasks surrounding waterproofing work.

Waterproofing System Types at a Glance

Each component has a place in the build-up. Keeping primers, membranes, detailing products, protection layers & finishes within compatible systems helps preserve the intended installation sequence.

Expert Tips for Waterproofing Work

Start at the Drain

Waterproofing can resist water ingress but it can't give a flat surface the fall it never had.

Confirm levels, outlets & drainage before applying membrane across a balcony, wet area, podium or roof.

Waterproofing should complement drainage rather than compensate for unsuitable falls.

Photograph Critical Details Before Covering Them

Today's visible membrane can become tomorrow's concealed construction.

Where project procedures permit, photograph corners, penetrations, outlets, upstands & completed membrane areas before they're covered.

Those records can help identify what sits beneath the finished build-up later.

Check Membrane Build During Application

Don't rely on appearance alone.

Where appropriate for the selected liquid membrane, follow the specified application rate or suitable wet-film checking method to monitor build.

Treat Thresholds as Separate Details

A doorway can concentrate several decisions into a very small area.

Membrane termination, drainage direction, finished floor levels & adjoining materials can all meet around a threshold.

Resolve those details before broad membrane application reaches them.

Keep Following Trades in the Picture

One misplaced fixing can turn yesterday's completed membrane into today's repair.

Plan later penetrations, supports, services & equipment installation so completed waterproofing isn't damaged unnecessarily.

The Jobsite Doesn't Forgive. We Do. looks at the value of preparation, dependable equipment & support across demanding worksites.

Let Conditions Set the Pace

The calendar might say it's time for the next coat. The site conditions still get a vote.

Temperature, rain, humidity & substrate conditions can influence application or curing depending on the selected product.

Spring Jobsite Prep provides practical preparation guidance for keeping equipment ready through changing site conditions.

Read the SDS Before the Lid Comes Off

Knowing the product means knowing how it needs to be handled.

Primers, epoxies, polyurethane products & other construction chemicals can require different PPE, storage, handling & emergency procedures.

How to Read a Safety Data Sheet - A Quick Guide for Workshop Operators provides a practical introduction to the information worth checking before work begins.