# cellular lightweight concrete and LEED MR 4.1

**URL:** <https://forum.4specs.com/t/cellular-lightweight-concrete-and-leed-mr-4-1/1040>\
**Category:** Sustainable Design Topics\
**Created:** [April 24, 2008, 6:23pm UTC](https://forum.4specs.com/t/cellular-lightweight-concrete-and-leed-mr-4-1/1040 "2008-04-24T18:23:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![robin](https://avatars.discourse-cdn.com/v4/letter/r/e5b9ba/32.png) [@robin](https://forum.4specs.com/u/robin)\
**Post date:** [April 24, 2008, 6:23pm UTC](https://forum.4specs.com/t/cellular-lightweight-concrete-and-leed-mr-4-1/1040/1 "2008-04-24T18:23:44Z")

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Does anyone know if it is possible to get recycled content in cellcore, elastizell etc? I didn’t see anything on their websites?

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**Author:** ![rick\_howard](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.4specs.com/rick_howard/32/362_2.png) [@rick\_howard](https://forum.4specs.com/u/rick_howard)\
**Post date:** [April 24, 2008, 6:59pm UTC](https://forum.4specs.com/t/cellular-lightweight-concrete-and-leed-mr-4-1/1040/2 "2008-04-24T18:59:27Z")

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I can’t give you a quantifiable answer to your question, but yes, these products may be able to contribute in small measure to recycled content.

These lightweight products are produced by making a foam that is mixed with approved cement slurry mix. A mix may include some fly ash replacing a certain percentage of portland cement. The allowable amount will vary with the density of in-place material. The technical folks with the manufacturers should be able to give you some approved mix designs for your application.