EIFS (Exterior Insulation and Finish System) can be waterproofed. Since it is not naturally waterproof, it must be sealed, coated, and properly drained to keep moisture out while maintaining breathability.
This guide explains how to waterproof your EIFS in detail. Keep reading to learn this and more.
If you have more questions or need EIFS services in Edmonton, AB, call (780) 710-3972.
Can You Waterproof EIFS (Exterior Insulation and Finish System)?
EIFS (Exterior Insulation and Finish System) can be waterproofed, but specific methods are required to prevent water infiltration while maintaining breathability. EIFS is not naturally waterproof, and improper sealing or drainage leads to moisture buildup, mold growth, and structural damage. Waterproofing EIFS involves sealing joints, applying protective coatings, ensuring drainage, and repairing cracks.
How to Waterproof EIFS (Exterior Insulation and Finish System)
EIFS (Exterior Insulation and Finish System) protects buildings but is not naturally waterproof. Water can seep through cracks, unsealed joints, or improper installation, leading to mold growth, insulation damage, and structural issues. Waterproofing EIFS requires sealing joints, applying protective coatings, installing drainage systems, and repairing cracks to prevent moisture infiltration.
Apply a Water-Resistive Barrier Over the Substrate
A water-resistive barrier (WRB) blocks moisture from reaching the wall beneath EIFS.
✔ Use a liquid-applied membrane or weather-resistant wrap over the entire surface before installing EIFS.
✔ Seal all seams and overlaps with mesh tape to create a continuous barrier.
✔ Allow the WRB to dry completely before adding insulation boards.
If you skip this step, you increase the risk of moisture retention behind EIFS, leading to mold and decay.
Install a Drainage System to Redirect Water
A drainage system allows moisture to escape and prevents water from becoming trapped behind EIFS.
✔ Use vertical adhesive ribbons to create small gaps for water drainage.
✔ Install grooved insulation boards or drainage mats for better airflow.
✔ Keep weep holes and drainage paths clear to allow proper water flow.
Trapped water weakens EIFS, causing swelling, peeling, and insulation failure.
Seal All Joints and Gaps to Prevent Leaks
Water enters EIFS through windows, doors, vents, and expansion joints. Sealing these areas blocks moisture intrusion.
✔ Apply an EIFS-compatible sealant where EIFS meets other materials like brick or wood.
✔ Use backer rods in wide joints to allow sealant flexibility during temperature changes.
✔ Inspect and reapply sealant every few years to maintain protection.
Unsealed joints create openings for water infiltration, leading to damage over time.
Apply a Waterproof EIFS Coating
A breathable waterproofing sealer adds a protective layer without trapping moisture inside.
✔ Choose a clear, EIFS-approved waterproofing coating that repels water.
✔ Apply the coating evenly across the entire surface.
✔ Reapply as needed to maintain its effectiveness.
Incorrect coatings prevent moisture from escaping, which leads to internal water damage.
Repair Cracks and Surface Damage Promptly
Cracks in EIFS allow water to enter the system, leading to mold growth and insulation damage.
✔ Inspect EIFS regularly for cracks or peeling areas.
✔ Use an EIFS-compatible patching compound to seal small cracks.
✔ Replace large damaged sections if moisture has already penetrated.
If you delay repairs, it increases the risk of deep water infiltration and costly restoration.
Keep Gutters and Downspouts Clear
Poor drainage from roof runoff increases the risk of moisture exposure to EIFS.
✔ Clean gutters and downspouts regularly to prevent overflow.
✔ Direct downspouts away from EIFS walls to avoid water pooling.
✔ Check for roof flashing leaks allowing water to seep into EIFS.
Constant exposure to running water leads to staining, erosion, and system failure.
Can You Waterproof Already Installed EIFS?
Already installed EIFS can be waterproofed, but the process requires sealing vulnerable areas, applying a protective coating, and improving drainage to prevent moisture infiltration. EIFS is not naturally waterproof, so taking these steps helps protect the system from water damage.
- Seal Joints and Gaps to Prevent Water Entry
✔ Apply an EIFS-compatible sealant around windows, doors, vents, and other openings.
✔ Use a backer rod in wide joints to allow flexibility and prevent cracking.
✔ Inspect and reapply sealant regularly to maintain protection.
Unsealed gaps allow water to seep behind EIFS, leading to insulation failure and mold growth.
- Apply a Breathable Waterproof Coating
✔ Choose an EIFS-approved waterproofing sealer that repels water without trapping moisture.
✔ Apply the coating evenly across the EIFS surface for full coverage.
✔ Reapply the coating as needed to maintain effectiveness over time.
- Improve Drainage to Prevent Water Buildup
✔ Ensure downspouts direct water away from EIFS walls to prevent constant moisture exposure.
✔ Keep gutters clean and debris-free to avoid overflow onto EIFS surfaces.
✔ Install weep holes or drainage channels if moisture retention is an issue.
Poor drainage leads to water pooling, mold growth, and insulation breakdown behind EIFS.
- Repair Cracks and Surface Damage Quickly
✔ Inspect EIFS for cracks, chips, or peeling areas.
✔ Use an EIFS-compatible patching compound to seal small cracks before they expand.
✔ Replace damaged sections if moisture has already penetrated.
If you ignore cracks, it allows water to enter, weakening the EIFS system over time.
Depend Exteriors Offers Professional EIFS Installation in Edmonton
Depend Exteriors specializes in professional EIFS installation in Edmonton. This provides energy-efficient, durable, and weather-resistant solutions for residential and commercial properties.
Our licensed and experienced team ensures flawless application to protect your building from harsh weather conditions. With over 15 years of expertise, Depend Exteriors is Edmonton’s trusted EIFS contractor.
Call (780) 710-3972 for a free estimate!
FAQs
Does EIFS need waterproofing?
EIFS needs waterproofing because it is not naturally waterproof. Sealing joints, applying a breathable waterproof coating, and ensuring proper drainage prevent moisture infiltration and structural damage.
What are the water issues with EIFS?
The main water issues with EIFS include trapped moisture behind the system, mold growth, insulation damage, and structural weakening. Water enters through cracks, unsealed joints, or improper drainage, leading to long-term deterioration.
Should there be a moisture barrier over the substrate of an EIFS system?
A moisture barrier should be installed over the substrate of an EIFS system to prevent water from reaching the underlying structure. A proper drainage system allows moisture to escape, reducing the risk of mold and water damage.
