We are Healthy, High Performance Insulation

Consider what happens to your indoor air quality when you insulate with subpar materials and your house doesn’t breathe properly. Per the EPA, indoor pollutants increase when there is not enough fresh air in a home.

Don’t let your builder, architect or insulation installer be in charge of your health.  Their interests are not always aligned with yours so make sure you inquire on all materials in your home.

Optimally, you should have a chemical-free passive filtration insulating material that insulates well, manages moisture and reduces sound. It’s good for your home, your family and the environment.

Why more people are using wool in their walls

  • Conventional insulation underperforms: subpar materials = subpar performance.
  • Indoor air quality matters: most conventional materials emit particulate or harmful chemicals.
  • Insulation needs to manage moisture:  with more and more air tight structures, condensation inside your walls is inevitable.
  • Sustainable building is the right thing to do for your family and for the planet

For those who want to know their home is built of high integrity materials that not only perform well but create a healthy environment, you are in luck as these materials are on the rise. Wool insulation is one of them.

Air is Like Food

  • Eating bad food will impact your health over time. Air will do the same exact thing.
  • EPA says indoor air quality is up to 5x worse than outdoor.
  • Houses are increasingly air-tight; if your house cant breath what are you breathing?
  • Harvard School of Public Health correlates cognitive function to material surroundings.
  • Coarse wool fibres irreversibly bond with NOx SO2 and formaldehyde.
  • Wool insulation improves indoor air quality.

Moisture is Everywhere

  • Moisture will inevitably make its way into your walls via condensation or vapor drive.
  • ASHRAE reports a family of four produces an average of 2.5 gallons of water vapor everyday.
  • Too much moisture causes mildew, mold and ultimately health problems.
  • A properly built cavity will allow for moisture to escape. 
  • Wool is the only insulation that actively manages moisture.

Materials Matter

  • The built environment will double from 2.4trn s/f over 40 years as will construction waste by 2025..(LINK)
  • Selecting longer lasting, natural, compostable materials reduces the environmental impact of growth.
  • A Yale University report found that waste in land-fills is >115% of EPA estimates.
  • Off-gassing and harmful particulate emission is common for mainstream insulation.
  • Natural, non-toxic, high-performance materials are increasingly employed in construction.
  • Wool insulation is sustainable and does not contain any harmful chemicals.

A fun and easy way to understand why you should have wool insulation in your home.

“We tried to make as many decisions that would keep our family safe for the long term… This was really an easy decision for us. With the Havelock Product, we feel good about what’s inside of our walls.”


Residential Insulation Materials Comparison

van insulation products


FIberglass is the industry standard that NO ONE likes. Particulate emission can be dangerous when inhaled. It is cheap and begs the question, what am I buying for a giveaway price? R value will not be maintained thus reducing your home’s efficiency. It is adversely affected by moisture, can mold and will not break down in landfill.

van insulation products


Newspaper is not a known insulator. Cellulose is a cheap alternative to fiberglass but again introduces weak fibers to the insulation equation. It is flammable thus requiring loads of chemicals. It is also quite susceptible to mold. On the positive, paper comes from trees which makes cellulose a positive medium in today’s fight against an extreme carbon footprint in the built environment.

van insulation products


Cotton is a nice try at an alternative to industry standard garbage. However, cotton fibers are weak and relatively incapable as an insulator. Moisture and flammability are both a challenge with cotton which means lots of chemicals and mold potential. In short, cotton is a nice alternative until you know about wool.

van insulation products


Again, a nice idea but not devoid of many inherent challenges. An extremely high net embodied energy does rockwool no favors in the carbon discussion. The formaldehyde binder does an end-user no good either. They changed their name to include wool for a reason, BUT they’re not the real thing.

Note: We did not include foam as it has no place in your home.  Click here to visit our blog and understand why.

How much insulation do I need?

All you need is a measurement of square feet to be insulated to determine bag count. Click HERE for detailed instructions.

Exterior Walls Measure LxH of each wall. Subtract any doors. Take note of cavity depth and don’t count the wall twice.
Interior Walls Measure L x H of each wall. Subtract any doors. Take note of cavity depth, eg 2×4 or 2×6. Count this wall once.
Floors Measure L x W of the floor. Take note of cavity depth, eg 2×8 or 2×10. Again, don’t measure this space twice.
Roof If possible just measure each pitch and multiply by 2 if they are symmetrical. Take note of rafter depths and spacing. If there are dormers or knee walls they need to be measured as well.


Whether you’re building a brand new home or renovating an existing one, it matters what you put between your walls. You need an insulation that not only performs but promotes a healthy home.

If you lead a healthy lifestyle, then you should consider the building materials in your home. It’s simple really. Using quality materials that respect the environment while outperforming, creates a home that keeps your family and the planet healthy. The mainstream building industry disagrees with this approach as there is usually a conflict between doing what’s right and doing what’s cheapest.

Things are changing though.

Consider the organic food movement. This not-so-new concept is increasingly mainstream because we understand the impact of what we eat. Sustainable building follows the same model and Havelock Wool is proud to be part of it.

Havelock Wool insulation is made of 100% wool. This unique fiber has evolved into the ultimate insulator – manages moisture, filters air, absorbs sound, suppresses mold – all while creating a healthy home and better planet.

Why You Should Use Wool for Home Insulation:

loose fill insulation

Easy Installation

loose fill insulation

Outperforming R-Value

loose fill insulation

Unparalleled Health & Safety

loose fill insulation

Passive Filtration

loose fill insulation

Moisture Management

loose fill insulation

Sound Absorption

Frequently Asked Questions:

Do you have a warranty for your product?

We are happy to warrant  the wool will serve as an insulator in a protected environment for 50 years.

Does wool settle?

No.  A leading challenge for insulation is moisture.  It reduces a (synthetic) fibers efficacy and ads weight to the product which can cause degradation, slumping or settling.  A coarse wool fiber has evolved to manage moisture – absorbing and desorbing against 65% relative humidity.

Are your products approved by my building department?

Yes.  Havelock products conform to Class A of the building code.  Test results are available and no exception is needed to use Havelock Wool.

Do you have installers?

We do not have installers employed by Havelock Wool.  We have installer relationships in a multitude of markets across the US.  We will also help you find one through our network and/or help your builder to take on the install him/herself.

How do you install your products?

Just like other insulation products, except you don’t need gloves, a mask or protective clothing.  Wool batts fit into cavities like other insulation and our blow-in product is blown behind a membrane using an insulation removal vacuum which virtually every installer has in their possession.  Useful videos can be found on our Youtube channel here.

Where can I buy your product?

Call us.  We’ll answer your questions, point you to a distributor or sell directly.

How do I measure?

With a bit of explanation it is rather simple.  We need square footage and cavity depth.  See the top of our residential page on the website or the PDF here.

How much do I need?

Building codes will help you understand what is required for your build.  From there you can add (not subtract) more insulation as you see fit.  Frankly, building codes are doing a good job to ensure the necessary amount of insulation is included in a structure.

I don't know my R-value.

R-value is a measure of thermal conductivity.  The higher the R-value the more protection your living space will have from the elements – hot or cold.  There are scenarios where you can have too much but that is probably north of R-60; more than likely cost will keep you from overdoing it.

My contractor says wool is not viable.

Your contractor does not know what he/she is talking about.   They are being lazy, don’t want to deviate from their standard practice and don’t care about your health.  Wool is the oldest insulator on the planet.  It’s inherent characteristics make it an insulation medium that is second to none.  Full stop.  We’d be happy to speak to your contractor to help them understand wool’s advantages.

The installers say wool is not viable.

Installers in many instances are more aggressive than builders when it comes to be stuck in their ways.  Success in their trade is measured by volume and speed.  Unknown new products can subtract from one or both which heightens their reluctance.  There are smaller, conscientious installers who are increasingly taking to wool.  We can help you find them.

How many bags fit on a pallet?

Batts: 12

Loose-fill: 21

Is there a discount for volume?

Typically no.  We will do everything we can to help you get wool in your build.  It is a better product than anything else you can buy – this includes the perspective of both health and performance.  Also, insulation costs are <2% of construction costs.  We want you to feel great about what goes in your walls and wool is the way to do it.  If we can help we will but discounts are tough as we’ve already tried to be as aggressive as possible with our pricing model.

Why is shipping so expensive?

Shipping insulation is a bit of a nightmare.  It is bulky and light.  These are two negatives in the shipping industry.  We are constantly trying to improve our packing to lessen the burden.  We are also open to new distribution relationships which will help.

What about moths and bugs? I heard this is a problem

Our products are treated for insects with a very slight amount of boric acid.  It is non-toxic, comes from the earth and is quite prevalent in the ocean.  We use ~8% by weight.  Other forms of insulation contain chemicals and/or boric acid.  None use as little as 8%.

What about rodents?

Rodents are looking for protection from the elements.  They don’t infiltrate a living space because there is wool versus fiberglass.  They simply want to get out of the cold, rain, or heat and will look for heat escape, for example, as a sign of where to go.  A well sealed house is your best deterrent; insulation should not be considered an attractor or a repellent.

Do you have any videos or I watched a video of a leaf blower- can I do this?

Yes.  See our constantly evolving Youtube channel here.

Do I need a vapor barrier?

Check your local code.  It may be required.  We are not fans of vapor barriers .  Moisture, condensation and/or vapor is inevitable in a wall cavity.  A vapor barrier will trap it when an escape route is required.  There are membranes that offer air tightness and are vapor variable so as to allow for that necessary escape route.  We suggest these over an impermeable vapor barrier.

Connect with the Havelock Flock

It is our goal to produce a truly superior building product with unrivaled integrity. We work exclusively with those who appreciate alternative building products and a healthier, more sustainable ecosystem. We are actively building consumer awareness concerning conventional toxic building materials.