EIFS (Exterior Insulation and Finish System) requires gentle and proper cleaning to maintain durability. Using the wrong cleaning methods—like high-pressure washing or harsh chemicals—can weaken the protective layer, allowing moisture to seep in and causing damage.
This guide outlines the best practices for safely cleaning EIFS.
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If you have more questions or need EIFS services in Edmonton, AB, call (780) 710-3972.
How to Safely Clean EIFS (Exterior Insulation and Finish System)
To safely clean EIFS, use a soft-bristle brush, mild detergent, and low-pressure water to remove dirt without damaging the surface. Avoid high-pressure washing, harsh chemicals, and abrasive scrubbing, as they weaken the protective finish and allow moisture to seep behind the system.
1. Use the Right Cleaning Supplies
Safe cleaning materials prevent damage to the EIFS surface.
✔ Soft-bristle brush removes dirt without scratching the finish.
✔ Low-pressure garden hose provides a gentle rinse without forcing water into the system.
✔ Mild detergent or EIFS-safe cleaner lifts dirt without weakening the coating.
✔ Bucket of warm water allows proper mixing of cleaning solutions.
✔ Soft cloth or sponge works well for spot cleaning.
Power washers, harsh chemicals, and metal brushes damage the EIFS structure by stripping the protective finish and weakening it.
2. Remove Loose Dirt Before Washing
Dry cleaning eliminates surface debris and prevents dirt from spreading during washing.
✔ Use a soft-bristle brush to sweep away dust and dry debris.
✔ Wipe off cobwebs and loose particles with a dry cloth.
✔ Rinse the surface lightly with a garden hose to remove any remaining dirt.
If you don’t remove loose dirt before washing, it causes streaks and uneven cleaning results.
3. Prepare a Safe Cleaning Solution
A mild detergent solution cleans EIFS without damaging the protective layer.
✔ Fill a bucket with warm water and add a few drops of mild dish soap or an EIFS-approved cleaner.
✔ Mix the solution well to dissolve the soap completely.
✔ Test a small hidden area to check for discoloration before applying it to the entire surface.
Strong chemicals, including bleach and ammonia, break down the acrylic finish and reduce the EIFS lifespan.
4. Wash the EIFS Surface Gently
Apply the cleaning solution carefully to prevent scratches and protect the EIFS coating.
✔ Dip a soft-bristle brush or sponge into the soapy water.
✔ Scrub lightly in circular motions to loosen dirt and grime.
✔ Work on small sections at a time for consistent cleaning.
Excessive scrubbing weakens the finish and exposes the underlying layers to moisture.
5. Remove Mold, Mildew, and Algae Safely
Mold and algae stains appear in damp and shaded areas of EIFS. A vinegar solution eliminates biological growth without harming the surface.
✔ Mix one part white vinegar with three parts water in a spray bottle.
✔ Spray the solution onto the affected areas and let it sit for 10-15 minutes.
✔ Scrub lightly with a soft-bristle brush to remove stains.
✔ Rinse thoroughly with clean water to wash away any residue.
Bleach weakens the finish and causes discoloration, making it unsafe for EIFS cleaning.
6. Rinse the EIFS Surface Thoroughly
Leftover soap or cleaning solution attracts dirt and causes streaking. A gentle rinse removes all residue without forcing water behind the EIFS.
✔ Use a garden hose in a low-pressure setting to rinse the surface.
✔ Start at the top and work downward to prevent streaks.
✔ Limit water exposure to prevent moisture buildup behind the system.
High-pressure washing damages EIFS by chipping the surface and forcing water into hidden areas.
7. Let the EIFS Dry Completely
Allow the EIFS to dry thoroughly to prevent moisture-related issues and streaking.
✔ Let the EIFS air-dry naturally for a few hours.
✔ Check for any remaining stains or missed spots after drying.
✔ Avoid touching or leaning objects against EIFS while drying to prevent dirt transfer.
Blow dryers and direct heat sources should not be used, as they may cause cracking or surface damage.
8. Inspect the EIFS for Any Damage
Check the EIFS after cleaning to help detect minor problems before they worsen.
✔ Look for cracks, holes, or peeling areas that require repair.
✔ Check for moisture buildup around edges, windows, and corners.
✔ Seal any exposed joints or weak spots to prevent water infiltration.
Cleaning does not fix damages. Repairs should be made immediately to prevent costly structural issues.
9. Clean EIFS Regularly to Prevent Heavy Dirt Buildup
Consistent cleaning maintains the EIFS appearance and prevents deep stains.
✔ Clean EIFS at least yearly to remove dirt before it settles.
✔ Wash more frequently in humid areas where mold and algae grow faster.
✔ Trim trees and bushes near EIFS walls to prevent moisture buildup and staining.
✔ Keep gutters and drainage systems clear to prevent water from running onto EIFS surfaces.
Clean regularly to prevent dirt from embedding in the surface, making removal more difficult.
Can EIFS (Exterior Insulation and Finish System) be Power Washed?
EIFS (Exterior Insulation and Finish System) should not be power washed because high-pressure water can damage the surface and create serious issues. EIFS has multiple layers, including a soft insulation board, base coat, mesh reinforcement, and a thin acrylic finish. Unlike traditional stucco or brick, EIFS is not designed to withstand the force of power washing.
Why Power Washing is Unsafe for EIFS
Power washing uses high-pressure water to clean surfaces, but EIFS (Exterior Insulation and Finish System) is not built to handle such force. EIFS has a soft insulation board, a thin base coat, fiberglass mesh reinforcement, and an acrylic finish. These layers work together to provide insulation and weather resistance but are not strong enough to withstand direct high-pressure water.
Below are the risks of power washing EIFS and how they can affect the system.
✔ Water Infiltration
Power washing forces water into tiny openings in the EIFS, pushing it behind the system and into the wall. Unlike traditional siding materials, EIFS does not have natural drainage gaps, which makes trapped moisture a serious issue.
Problems Caused by Water Infiltration:
- Mold and Mildew Growth—Trapped moisture creates the perfect conditions for mold and mildew to grow. These germs spread inside the wall and cause health risks and structural decay.
- Rotting of the Substrate – If water reaches the wood, drywall, or metal framing behind the EIFS, it can cause rot, rust, and weakening of the wall structure.
- Loss of Adhesion—Water trapped between the EIFS and the wall can break down the adhesive, causing sections of the EIFS to loosen, bubble, or completely detach from the building.
- Freeze-thaw Damage—In colder climates, moisture trapped inside the wall expands and contracts as it freezes and thaws, leading to cracks and further deterioration.
✔ Surface Damage
EIFS is made of thin acrylic coatings and soft insulation, which are easily damaged by the strong force of power washing. High-pressure water can strip the protective finish, weaken the surface, and expose the underlying materials.
Types of Surface Damage from Power Washing:
- Chipping and Cracking – High pressure can crack or chip the outer coating, exposing the insulation board to weather damage.
- Peeling and Flaking – EIFS finishes include a color and texture layer that can peel or flake off when hit with intense water pressure, making the building look worn and uneven.
- Puncturing the Insulation – Some power washers use extremely high pressure, which can poke holes in the insulation board, leading to further structural issues.
- Uneven Wear and Fading – Power washing erodes the surface layer unevenly, leading to patchy areas where the finish becomes thin or discolored.
Once the surface is damaged, water can seep in more easily, leading to bigger problems like moisture intrusion, mold, and insulation failure.
✔ Loss of Insulation Efficiency
EIFS improves energy efficiency by reducing heat transfer between a building’s interior and exterior. When the system is saturated with water, its insulation properties are significantly reduced.
How Power Washing Affects Insulation Efficiency:
- Water Absorbed into the Insulation – The insulation board beneath EIFS is not waterproof. Once it soaks up water, it loses its ability to trap heat and cold, making the building less energy efficient.
- Increased Heating and Cooling Costs – When EIFS insulation fails, indoor temperatures become harder to control, forcing HVAC systems to work harder and increasing energy bills.
- Weakened Thermal Barrier—A wet or damaged EIFS system fails to reflect heat properly, making buildings hotter in summer and colder in winter.
- Higher Risk of Long-Term Damage – Wet insulation takes a long time to dry, and persistent dampness leads to mold, mildew, and material breakdown, requiring expensive repairs.
Once insulation efficiency is lost, the entire EIFS system may need replacement, which will cost more than simple maintenance or cleaning.
Depend Exteriors Offers EIFS Stucco Services in Edmonton
Depend Exteriors provides expert EIFS stucco services in Edmonton, specializing in installation, repair, and retrofitting for residential and commercial properties. Our licensed, bonded team offers energy-efficient, durable, and weather-resistant EIFS solutions. With over 15 years of experience, Depend Exteriors is Edmonton’s trusted EIFS contractor.
Call (780) 710-3972 for a free estimate and expert service!
FAQs
Can you pressure wash EIFS?
You should not pressure wash EIFS because high-pressure water can damage the surface and force moisture behind the system, leading to mold and structural issues.
How do I wash EIFS?
To wash EIFS, use a soft brush, mild detergent, and low-pressure water to remove dirt and stains without damaging the finish.
Is it safe to power wash EIFS?
No, it is not safe to power wash EIFS because intense water pressure can crack the surface, strip the coating, and cause water infiltration.
