Applying BASE clay plaster

A basecoat clay plaster

Applying BASE clay plaster

Tierrafino BASE is a clay plaster that serves as a render, skim coat and/or finish for walls and ceilings in the interior.

Applying BASE clay plaster

Area of Application

Tierrafino BASE is a render, skim coat and finish for sufficiently load bearing walls in the interior.

Can be applied in the exterior where protected from direct contact with water.

Suitable for humid rooms, but do not apply where there is a chance of direct contact with water.

Suitable for plastering at a thickness of 5-15 mm per coat of load bearing, uneven, rough, flat and prepared substrates like brickwork, reed mats, base clay-,  gypsum- and lime-plasters, concrete and dry wall systems.

Preparation of the substrate for applying BASE

Load bearing, continuously dry, absorbing, sufficiently rough to provide a mechanical key, free of dust and grease.

Remove wallpaper and flaking paint. Prepare non-absorbing substrates with a tile glue or a suitable sprayed cement. Pre-moisten highly absorbing substrates with water before application of BASE in order to prolong the workability and to enhance adhesion. Treat smooth substrates with Tierrafino Contact.

Do not pre-moisten substrates treated with Tierrafino Contact before application of BASE.

Applying BASE clay plaster Tierrafino

The air- and substrate temperature must be at least 5°C. Add 3.5 – 4 kg of BASE to 1 liter of water and mix until a homogeneous mass.

General

Work reinforcement mesh into BASE on seams and on transitions between different substrates before applying Tierrafino Contact primer and BASE. When in doubt, also work a 10 mm mazed reinforcement mesh into the whole surface. When working with plaster profiles, use stainless steel profiles due to the slow drying of BASE. When a smooth plastered surface is required, apply BASE max. 7 mm thick.

Several layers of BASE:

Choose the appropriate type of BASE. Apply the first coat of 10-15 mm, make straight with a feather edge. Roughen with a tile adhesive comb in horizontal direction. After drying out completely, slightly moisten and repeat. Do not apply more than 7 mm for a smooth finish.

BASE as a substrate for Tierrafino Finish, Duro or other Tierrafino clay plasters

Choose the appropriate type of BASE. Apply the first coat of 15-15 mm, make straight with a feather edge and/or sponge. After drying out completely, slightly moisten before applying Finish/Duro or one of our other clay plasters.

BASE as a substrate for clay paints

Choose the appropriate type of BASE. Follow the instructions for application and finishing as described below in Coarse finish or Smooth finish.

BASE as a substrate for Listro

Choose the appropriate type of BASE. Follow the instructions for application and finishing as described for achieving a Smooth finish. Use a layer thickness of est. 0,5 – 1 mm.

Matt

400-500 grams of dry mixture is needed for 1 m2 of surface. Apply one coat with a trowel and allow to dry. Consumption is higher when applied on coarse substrates.

Glossy

For 1 m2 of surface, 2 x 400-500 grams of dry mixture is needed. Apply the first coat with a trowel and let it dry. Then apply a second coat with a trowel and polish it Shiny with wax.

Process the first and second layer as described under the heading ‘Glossy’.

After drying, apply Tierrafino Wax as described under Smooth plastered.

BASE as a decorative finish

Coarse finish

Choose the appropriate type of BASE. After some hardening (depending on circumstances between 10 minutes and 4 hours), float the surface with a
sponge. This will determine the shape en it will close the surface. Follow the instructions as described in ‘Finishing’ below.

Smooth finish

Apply max. 7 mm BASE plaster. Choose the appropriate type of BASE. After some hardening (depending on circumstances between 10 minutes and 4 hours), float the surface with a sponge. Now smoothen the surface with a trowel, this will press the sand into the plaster and create a smooth surface. Follow the instructions as described in ‘Finishing’ below.

Finishing

When Base is still humid the surface is carefully wiped down with a damp sponge. This will make individual sand particles visable in the surface. Then vigorously wipe the surface with a hand held coconut- or horse hair brush. This will create a wipe proof surface. Repeat when necessary. If the surface shows dry areas, moisten these before finishing.

Drying time of BASE

Under normal circumstances (+20°C and 60% relative air humidity), BASE is dry between 4 hours and 7 days. When drying circumstances are difficult: dry
BASE rapidly by using a heater. Place the heater at least 2 meters from the BASE wall. BASE with straw, once mixed with water, must be dry within 7 days.

Tools

Plasterer’s tub, mixer, water spray, hawk, laying on trowel, feather edge, sponge, plastic trowel, hand held brush, masking tape, suitable plaster
spray machines: G4, G5, MP25, S28, P13, S5 & S30.

Storage

Store dry. Tierrafino BASE in dry condition can be stored indefinitely. .

Composition

Sands, clay and straw (optional)

Thinner

Water

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The information in this product description has been compiled with the greatest care. However, Tierrafino does not accept any responsibility for direct or indirect damage that may occur when using the information provided. With each new edition of the product information, the validity of the previous edition expires.