Non-toxic natural building insulation made of grass

Natural building insulation materials

In order to combat the climate change impact of the built environment, natural insulation materials such as hemp insulation, cellulose, wood fiber and grass insulation help us meet emission targetsbecause they act as carbon storage. We are living in a time when the embodied energy of buildings is finally gaining the attention it deserves; an example is the release of theEC3 Calculator for calculating the carbon footprint of buildings.

Finding natural ways to insulate a home这一切都很好，但任何自然建筑保温材料都需要表现得和主流商业替代品一样好，如果它要成为绿色家庭建筑行业的一个可行的参与者。Organic insulation materials can, in some instances, be at a greater risk of developing mold, or perhapshosting insects and rodents, compared to non-organic products such as rigid foam insulation boards, Rockwool orspray foam insulationto name a few examples.

Some natural insulations are better suited to slip into the more ‘mainstream’ yet ‘green home leaning’ building industry than others, which are the ones that can replace existing products without being too noticeable. By being ‘noticeable’ I mean things like straw bale home construction which is a thing of its own, or recovered sheep wool insulation from local fields as another example, which might apparently make your house smell like an old barn in the Sottish Highlands during prolonged rainy weather. That....would be noticeable. (unless of course using an actual cleaned and manufactured natural wool insulation product which is now possible.)

There are some likecellluloseand wood fiber panels that have been around for awhile, but a few of the newer and more interesting ones we've found include hemp insulation, andgrass insulation panels from Gramitherm. And while we're at it, I think the newformaldehyde-free rice stalk MDF boards值得一提的是，也许我们在未来也会看到稻秆保温。

So, we were interested to find that Gramitherm®, a patented technology that enables the production of natural insulation batts made from meadow grass fibers, has many of the same properties as our other favorite natural insulation products, which we will discuss below.

Carbon capture & storage with building materials

Where most building materials have a ‘carbon footprint’, meaning the amount of embodied energy required to extract raw materials and manufacture products, some natural building materials, like the grass insulation from Gramitherm that we just came across, actually have a negative carbon footprint due to the carbon absorbed and sequestered within it.

There is also this one here called Elephant grass, which, as cool as it sounds, doesn’t look poised to drive rigid foam boards out of the North American building industry just yet. But kudos to the makers of it and we though it deserved a quick shout out.

Grasses in nature simply die, rot and grow again, but in cases where it is post-industrial or agricultural waste, it would need to be disposed of. In each case, one way or another the carbon in the plant fibers would be returned to the atmosphere. But instead, with Gramitherm insulation batts for example, the carbon absorbed by the plants ends up contained in your walls. It is estimated that an average-sized house completely insulated with Gramitherm batts fromClean Insulating Technologiescan capture 7 tons of CO2. So far so good…

Managing moisture levels in a home

Here is one of the benefits of hemp and grass insulation – they both have the ability to safely store higher levels of moisture than most materials. This can be a hard concept to grasp at first, so think of it the same waythermal mass absorbs and releases heat(meaning - the way stone, concrete, wood, water, substances with a lot of mass absorbs and holds heat). When relative humidity levels inside your home or walls change, some of that moisture will be absorbed and released by the materials in your home. And, as it's that time of year whencondensation on windows can indicate a problem在美国，拥有一些安全的被动湿度储存设备从来都不是一件坏事。

Have you ever noticed that sometimes a squeaky floor boards get quieter for no apparent reason? Or a drawer is sometimes easier or harder to open? Or… your guitar sounds terrible after a heat wave? Most homes are full of wood products, and they will absorb and release moisture as the levels change, and they will expand or contract in the process.

And to have more fun with anologies…a box of crackers can be left unsealed on the counter in a desert climate like California, but in a humid climate like Florida for example, un unsealed box of 'crackers’ will turn into ‘benders’ due to the humidity, as they will soon match the rigidity of Wonderbread.

The fibers in grass andhemp building materialsare not heavily processed (like with cellulose or wood fiber), So they can safely store higher levels of moisture than many other building materials. Or crackers. They can therefore help regulate the moisture levels in a home (like crackers), and that makes them a little bit more durable, since moisture, in all its forms – ice, snow, bulk water, water vapor, is the kryptonite of a super home.

Natural insulation for soundproofing

Reducing sound transmission in buildings improves the quality of life for occupants and allows the construction of smaller homes while keeping privacy as a priority. Some are better than others at this, a lot of it has to do with the mass of the product, so things likeEPS, XPS and Polyiso rigid insulation boards are mostly air, so sound can move through them fairly easily.Rockwool brands itself as a soundproofing insulation, which it does a fair job at, but so do Hemp, grass, even dense pack cellulose and wood fiberboards.

Reduce pollution and protect indoor air quality

There is a steady increase in the amount of people that suffer from chemical sensitivities, and natural building materials can help alleviate that. Formaldehyde and other chemicals are commonly used in the manufacturing of building products, that adds to global air pollution as well as contaminatingindoor air qualityas these chemicals off gas into the air in your home. Choosing natural building materials without chemicals and VOCs will lead to safer indoor air quality and reduced health risks for homeowners - although we would always suggest ventilating modern airtight homes bychoosing a HRV or ERV system.

More cool things about grass insulation

• 70% less water is required for manufacturing grass insulation compared to fiberglass insulation;
• insulating value of R 3.5 per inch;
• treated for fire resistance, in the event of a fire it does not emit toxic fumes;
• mold resistant;
• dimensionally stable;
• 2.4 acres of land can produce 200 cubic meters of insulation.

The downsides of 'natural' insulation

Innovative green building products usually start out the same, they are almost always more expensive and much harder to find. But that was the case with solar panels, zero VOC paint, or even low-flow toilets when they all first came out.

Natural insulation materials like these can easily cost you double the price of standard insulation products, so don’t get your hopes up too high if you’re building a house on a super tight budget.

That said, for some people this can be a necessity, or a home can simply be uninhabitable. Its hard to put a price on health, and the air in homes can typically be up to 5 times more polluted than outdoor air due to the amount of chemicals in building materials. As the market for healthier green homes grows, the demand for green building products increases, which naturally drives the price down.

作为一个离别的想法——另一个可能要注意的缺点，是“环保”的建筑材料，可能只是有点太“过时了”。一些绿色建筑先锋可能在拯救世界的尝试中走得有点太远了，他们提出的建筑材料只是没有持久力来维持房屋的寿命。我在这里并不是要单独挑出一个产品，我只是想说，要注意不要过分偏离边缘产品和概念，它们可能没有经过适当的寿命测试。

If anyone thinks they know the 'next best thing' ingreen building materials, please let us know in the comment section below, we'd be happy to have a look!

Now that you know more aboutnatural building insulation panels made from grass, findmore pagesaboutsustainable and healthy green building techniqueshere : Where to get natural grass insulation from Gramitherm Where to find hemp batt insulation in Canada and the U.S. Choosing the right insulation for walls, roofs, slabs & basements How to maintain healthy indoor air quality in homes How to find formaldehyde-free kitchen cabinetry materials Visit the EcoHomeGreen Building Guide pagesand learn how to build more durable, healthy and efficient homes.