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How to bind earthen plaster to Timber Frame & Concrete?

 
Posts: 3
Location: Zona Sur - Costa Rica
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Good afternoon all,

My wife and I have designed a hybrid timber frame in the the cloud-forest in Costa Rica.

The first floor is a raised concrete post & beam style, with a hybrid-timber frame built on top. We intend to earthen plaster waddle & daub style between timbers and concrete.

As we live in an area with lots of moisture, (a 3 meter veranda won't protect from the cloud condensation on exterior walls). we plan to enclose the timbers in an earthen plaster with lime finish.

Ive read up on tons of information on how to go about adhering earthen plasters to concrete & wood but haven't found THE definitive method or confirmation we need to give us the confidence boost.

For the second floor timbers, 7"x7" posts and 4"x8" beams, we are considering the option of using only an adhesion coat...

our concern is at the 7x7 corner posts: will the corner be difficult to create a bond? Would the following be a good solution? 1. apply an adhesion coat to the timbers, 2. add a layer of burlap, 3. coat with clay/straw mix. 4. lime plaster. Would the burlap have to be attached to the frame somehow, say with staples? or perhaps connected where the waddle connects to the timber...

our other doubts revolve around the raised concrete foundation we have build our timber frame on.

the raised foundation is build from 12" x 12" poured concrete posts, and tied together with 6"wide x 18" tall poured concrete beams. the finished floor sits about 3ft above grade with a space of about 1.5 ft between ground and the underside of the beam

What would be a good solution to thinly plaster over the 12"x12" posts & 18" beams?

we are considering adding a rough parge coat of cement mix to provide a surface for the plaster to adhere to better... then adding an earthen adhesion coat and finishing with lime plaster. how does this sound? is it necessary to add a lattice, such as chicken wire, or will the parge then adhesion coat suffice?

Also, we are having difficulties locating a good adhesion coat recipe. should manure be added? or is a flour/sand/earth/straw adhesion coat sufficient? what ratio should manure be added if so?

Thanks in advance for your two cents  :)

 
pollinator
Posts: 1500
Location: Bendigo , Australia
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Why do you wish to encase the timbers?
Are there any examples of what you are doing locally?
Dont use any cement, it will make moisture problems worse.
 
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