This article summarizes the official Earthaus Base Plaster Product Data Sheet, adapted for clarity and ease of reference. To view the full document, see the Base Plaster Product Data Sheet (PDF).
What Is Base Plaster?
Earthaus Base Plaster is an interior lime plaster with a granular texture. It is specifically formulated as the basecoat for the Earthaus Tadelakt system, but can also be used as a finish plaster for a rustic, coarse matte aesthetic. Made from 100% natural materials, Base Plaster is breathable, durable, and eco-friendly.
Composition
Hydrated lime
Pumice aggregates
Cellulose binder
Packaging
Bag size: 32 lbs
Pallet quantity: 60 bags
Properties
100% natural materials
Zero VOCs or chemical additives
Durable, breathable, and mold-resistant
Absorbs CO₂ during curing, reverting back into limestone
Usage
Designed for interior applications, applied over:
Approved wet-area substrates (as part of the Earthaus Tadelakt Finish System)
Level-4 finished drywall
Painted walls
Plaster basecoats
Installation
For basecoats in Tadelakt: see the Tadelakt Finish Installation Guide.
For finish plaster applications: see the Base Finish Installation Guide.
Limitations
Not suitable for exterior use.
Color
Standard: white with a light grey undertone.
As a finish plaster, Base Plaster can be tinted with Earthaus mineral pigment colors or universal colorants.
Applied Thickness & Coverage
As basecoats for Tadelakt Plaster: 50 ft² per 32 lb bag (two ⅛" coats).
As a finish plaster: 100 ft² per 32 lb bag (two 1/32" coats, total 1/16").
Sealing
When used as a finish, Base Plaster can be sealed with Earthaus Olive Oil Soap Sealer to create a water-resistant yet vapor-permeable surface.
Storage
Mixed plaster: store covered at room temperature for up to 14 days. Remix before use.
Unmixed bags: store dry, in low humidity, for up to 1 year.
Disposal
Allow excess Base Plaster to dry completely.
Dispose of dried plaster in household trash.
Safety Information
Hydrated lime is strongly alkaline and may cause severe injury upon contact with eyes or skin. Dust inhalation may irritate the respiratory system.
Required PPE: gloves, eye protection, long sleeves, dust mask or respirator.
Avoid: skin and eye contact, prolonged dust inhalation.
Emergency response:
Eyes: Flush with water; seek immediate medical attention.
Skin: Wash with water and mild soap; consult physician if irritation persists.
Inhalation: Move to fresh air; seek medical attention if symptoms persist.
Ingestion: Do not ingest; seek medical attention immediately.
Disclaimer
The performance and appearance of Base Plaster depend on proper handling, preparation, and installation techniques. Earthaus does not assume responsibility for outcomes beyond its control.
© 2025 Earthaus Plaster LLC.
Still Have Questions?
Email [email protected] or text 1-800-917-2414.