Wall Insulation

Wall Insulation

If you’ve ever wondered why some rooms in your house feel drafty in winter or heat up too quickly in summer, the answer often lies behind your walls. Wall insulation is one of the most essential—yet frequently overlooked—parts of a comfortable, energy-efficient home. Whether you're building new, remodeling, or just trying to improve your existing home’s performance, understanding wall insulation is key.

At Seattle Insulation, we believe that every homeowner deserves to be informed about how insulation works and how it can dramatically impact your comfort, energy bills, and even the environment. Let’s take a deep dive into wall insulation—what it is, how it works, and how to choose the best option for your home.

Why Wall Insulation Matters

Insulation serves as a thermal barrier. It slows down the transfer of heat, helping to keep warm air inside during Seattle’s chilly winters and outside during the hot months. While attic and crawl space insulation often get the spotlight, walls represent a large surface area where energy can be lost if they’re not properly insulated.

Poorly insulated walls lead to:

• Higher heating and cooling costs

• Inconsistent indoor temperatures

• Drafts and cold spots

• Excessive strain on HVAC systems

• Reduced soundproofing between rooms or from outside noise

Adding or upgrading your wall insulation can solve many of these issues in one go.

Types of Wall Insulation

There are several types of insulation materials used in walls. Each has unique benefits, depending on your budget, wall type (existing vs. new construction), and climate.

1. Fiberglass Batts

Fiberglass is one of the most common insulation materials, typically found in batt or roll form. It’s relatively affordable and easy to install in open wall cavities.

Best for: New construction or major remodels where the walls are open.

Pros:

• Cost-effective

• Good thermal resistance (R-value)

• Readily available

Cons:

• Can leave gaps if not installed properly

• Less effective against air leaks

2. Blown-In Cellulose

Made from recycled paper treated with fire retardants, cellulose insulation is blown into wall cavities through small holes. This makes it a great choice for retrofitting existing walls.

Best for: Older homes or when adding insulation to finished walls.

Pros:

• Environmentally friendly

• Fills in irregular cavities and gaps

• Good soundproofing

Cons:

• Can settle over time

• Requires professional installation

3. Spray Foam Insulation

Spray foam expands upon application, creating an air-tight seal that’s excellent for thermal and moisture protection.

Best for: High-performance insulation needs or hard-to-reach wall areas.

Pros:

• Highest R-value per inch

• Excellent air sealing

• Reduces moisture and mold risk

Cons:

• More expensive

• Requires trained professionals

4. Rigid Foam Panels

These boards can be cut and fitted between studs or added to the outside of wall sheathing in some cases.

Best for: New builds or major exterior renovations.

Pros:

• High R-value

• Moisture-resistant

• Durable

Cons:

• Difficult to retrofit

• Needs precise installation to avoid gaps

How to Know If Your Walls Are Under-Insulated

Many homes in Seattle—especially older ones—were built before energy codes required effective insulation. If you’re unsure whether your walls are properly insulated, here are some signs to watch for:

• Drafts: Feeling cold air even when windows and doors are closed

• Uneven Heating or Cooling: Some rooms are always warmer or colder

• High Energy Bills: Poor insulation makes HVAC systems work harder

• Cold Walls: Interior walls feel chilly to the touch during winter

• Noise: You hear a lot of outside noise or room-to-room echoes

A home energy audit or thermal imaging inspection can provide a clearer picture.

The Seattle Climate Factor

Seattle’s unique climate—a mix of damp winters and mild summers—makes wall insulation a priority. The constant dampness can also lead to mold if insulation isn’t installed correctly or if moisture barriers are missing. Choosing moisture-resistant insulation and working with professionals who understand local codes and weather patterns is crucial.

Professional vs. DIY Wall Insulation

While some insulation types can be installed by experienced DIYers, wall insulation—especially retrofitting—is often best left to professionals. Here’s why:

• Expert Evaluation: Pros can recommend the right type based on your wall construction and needs.

• Proper Sealing: Air sealing and moisture barriers are just as important as the insulation itself.

• Code Compliance: Professionals ensure your home meets Seattle’s energy codes.

• Efficiency & Longevity: A well-done job lasts longer and performs better.

Final Thoughts

Wall insulation is one of the smartest investments you can make in your home. Whether you're aiming for better energy efficiency, increased comfort, or lower utility bills, upgrading your wall insulation is a cost-effective way to achieve those goals.

At Seattle Insulation, we’re here to help you make informed, confident decisions about your home’s insulation. From evaluating your current setup to professional installation using the highest quality materials, our team is ready to help you create a home that feels just right—year-round.

Contact us today for a free consultation or to schedule a home insulation evaluation. Let’s make your walls work for you!