> For the complete documentation index, see [llms.txt](https://docs.rainbowstandard.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rainbowstandard.io/methodologies/biobased-construction-materials/eligible-technologies.md).

# Eligible technologies

## Project type

The project may be **biobased construction material manufacturing**. In this case, carbon credits are issued according to the amount of biobased materials sold to building developers during the reference calendar year. The Project Developer may be the biobased construction material manufacturer.

The project may be **the use of biobased construction materials in new, permanent building construction or renovation of permanent buildings** during the reference calendar year. RCCs are issued according to the amount of biobased construction materials used in the new building construction. The Project Developer may be the building developer, i.e. the entity responsible for technical choices, building design, and oversight of the development.

## Biobased material type

Biobased construction materials may include but are not limited to, wood framing, wood panels, hempcrete (concrete containing hemp fibers), and cellulose thermal insulation.

Types of biomass used for biobased construction materials may include wood (timber/lumber), bamboo, hemp, straw, recycled paper, and flax, among others.

## Project scope

For the **manufacturing of biobased construction materials**, one project corresponds to the production of a single biobased product by one registered company within a single country.

{% hint style="info" %}
For example, if a company has multiple production sites for the same biobased material across different countries, separate projects should be registered for the facilities within each country.
{% endhint %}

For the **use of biobased construction materials in buildings**, one project shall include constructing one or more buildings that include biobased materials, provided all buildings are in the same country.

## Credit issuance

For the **manufacturing of biobased construction materials**, credits are issued ex-post upon proof of sale of the construction product.

For the **use of biobased construction materials in buildings**, credits are issued ex-post upon proof of completed construction and delivery of each building containing biobased construction materials.

Projects certified under this methodology shall have a maximum crediting period duration of 5 years, which can be renewed for a total of 20 years. See the [Crediting Period Renewal](/rainbow-standard-documents/procedures-manual/project-certification-procedure.md#crediting-period-renewal) section of the Procedures Manual for procedural details.


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