How to Safely Cover Asbestos Siding

Asbestos siding, common in homes built before the 1980s, presents unique challenges during renovations due to its potential to release harmful fibers when disturbed. Covering it with new siding offers a practical way to modernize your home’s exterior without full removal, provided you follow strict safety protocols. This approach minimizes airborne particles while complying with regulations from agencies like the EPA.

Understanding Asbestos Siding and Its Risks

Asbestos-containing materials (ACM) in siding, often appearing as rigid, cement-like shingles, pose minimal risk when intact and undisturbed. The danger arises when fibers become airborne through actions like drilling, sanding, or breaking, potentially leading to serious respiratory diseases such as asbestosis, lung cancer, and mesothelioma upon inhalation.

Homes with weathered, cracked, or damaged siding require immediate attention. Intact siding can often be safely encapsulated by new layers, but regular inspections are crucial to detect deterioration early. Professional testing confirms asbestos presence if identification is uncertain—DIY kits or lab analysis provide reliable results.

Essential Personal Protective Equipment for the Job

Proper gear is non-negotiable to prevent exposure. Always equip yourself with:

• P100 or N100 respirator: Filters out microscopic fibers; ensure a tight face seal.
• Disposable coveralls with hood: Full-body protection, sealed at wrists and ankles.
• Chemical-resistant gloves and rubber boots: Prevent skin contact; use disposable covers for boots.
• Safety goggles: Seal against dust ingress.

Wear this ensemble throughout preparation and installation. Dispose of contaminated items properly after use, and shower immediately to remove any residual particles.

Preparing Your Workspace Safely

Preparation prevents contamination spread. Start by:

• Clearing the area: Remove nearby furniture, plants, and debris; cover ground with 6-mil plastic sheeting.
• Sealing the site: Use plastic sheeting and duct tape to isolate the work zone from the home’s interior. Turn off HVAC systems to avoid fiber intake.
• Posting warnings: Mark the area as hazardous; restrict access to authorized personnel only.
• Avoiding agitation: Skip power washing, scrubbing, or high-pressure cleaning, as these release fibers.

Inspect siding thoroughly for loose pieces. Gently secure any minor damage with tape if needed, but consult professionals for significant issues.

Step-by-Step Guide to Installing Siding Over Asbestos

Encapsulation involves layering materials to secure the asbestos without penetration. Here’s a detailed process:

1. Assess and repair surface: Check for cracks or bulges. Fill minor gaps with asbestos-safe sealant; do not sand.
2. Apply foam board insulation: Install rigid foam sheathing over the siding using construction adhesive. This creates a buffer layer without nails.
3. Add moisture barrier: Roll out house wrap or a vapor-permeable membrane, securing with staples into the foam only.
4. Install furring strips: Attach 1×3 wood strips horizontally over the barrier using adhesive or clips that avoid asbestos penetration. Space 16-24 inches apart for ventilation.
5. Mount new siding: Secure vinyl, fiber cement, or metal siding to furring strips with screws. Ensure panels overlap properly for weatherproofing.

Avoid drilling into asbestos at all costs—use alternative fastening methods. Work top-to-bottom to contain debris.

Alternative Management Strategies

Not all situations suit covering. Consider these options:

For removal, hire certified contractors following EPA and OSHA guidelines: wet materials, use HEPA vacuums, and dispose at approved sites.

Legal and Regulatory Compliance

Asbestos handling falls under strict rules. In the U.S., EPA’s National Emission Standards for Hazardous Air Pollutants (NESHAP) mandates notification for renovations disturbing over 260 linear feet of siding. State and local codes vary—check with your department of environmental quality.

Homeowners performing minor work may qualify for exemptions, but professionals must be licensed. Improper handling risks fines up to $37,500 per day. Always document actions for liability protection.

Common Mistakes to Avoid

• Ignoring PPE: Even brief exposure accumulates risk over time.
• Using power tools: Drills and saws aerosolize fibers.
• Poor containment: Fibers can travel indoors via air currents.
• Skipping inspections: Hidden damage leads to surprises.
• Improper disposal: Landfills reject asbestos; use designated facilities.

Frequently Asked Questions (FAQs)

Can I paint over asbestos siding instead of covering it?

Painting is not recommended as a long-term solution, as it doesn’t encapsulate fibers and can crack, leading to exposure. Covering with siding or professional sealing is preferable.

How do I know if my siding contains asbestos?

Visual cues include a chalky, cement-like texture on pre-1980s homes. Confirm with professional sampling to avoid guesswork.

Is it cheaper to cover or remove asbestos siding?

Covering costs 30-50% less than removal but may require future abatement. Removal averages $10-20 per sq ft, depending on location.

What if I accidentally disturb the siding?

Stop work, seal the area, ventilate safely, and call a certified abatement team for cleanup.

Does new siding void my home insurance?

Not typically, but disclose asbestos during claims. Encapsulation preserves coverage if done correctly.

Long-Term Maintenance After Installation

Post-installation, inspect annually for new siding shifts or underlying damage signs. Maintain ventilation gaps to prevent moisture buildup, which could degrade the asbestos layer. Reapply sealants as needed, always wearing PPE.

For homes in harsh climates, consider impact-resistant siding to protect the encapsulation. Budget for professional reinspection every 5-10 years to ensure integrity.