Weave and mud the walls

Weave springy branches between the posts and press on mud, straw, and dung until the wind cannot find a way in.

takes patience⏳ a weektradition — not yet hand-tested

A frame keeps the roof up, but the spaces between the posts are just holes for wind and rain. Wattle and daub fills them. Wattle is a woven panel of sticks — the same over-under weave as a basket, only wall-sized. Daub is the mud plaster you press onto it: clay for stickiness, straw for strength, dung to bind it. The result is warm, quiet, and lasts for generations — some such walls are still standing after five hundred years. The whole trick fits in one sentence: keep the weave springy, keep the mud fibrous, and dry it slowly.

You need

• A standing frame with the roof already on — daub must never dry in direct rain or hot sun, so the roof goes on first.
• Upright stakes (staves) — straight sticks, thumb- to wrist-thick, one for every hand-span of wall.
• Long bendy rods (withies) — hazel or willow, finger-thick, as long as you can cut them. Fresh-cut bends best; you need a bigger pile than you think.
• Clay-rich earth — dig below the dark topsoil. Good subsoil rolls into a sausage in your hands without crumbling.
• Chopped straw or dry grass — cut into hand-length pieces. This is the hair in the plaster; without it the mud cracks apart.
• Fresh cow or horse dung — its chewed fibers and gut juices make the daub sticky and crack-resistant. Once dry it does not smell.
• Water, a mixing pit, and bare feet — feet mix daub better than any tool.

Steps

1. Fit the staves. Stand the stakes upright in each wall opening, about a hand-span apart — tops into holes or a groove in the beam above, feet against the beam below — so they sit firm but can flex a little.
2. Weave the withies. Weave each rod across the staves — in front of one, behind the next — just like a basket, pushing each row down snug and alternating the weave so it locks. Stop when the panel barely rattles when shaken.
3. Mix the daub. In a shallow pit, combine roughly 3 parts clay subsoil, 1 part chopped straw, and 1 part dung, adding water a splash at a time. Tread it with bare feet until it is one even, stiff dough that holds a thumbprint without slumping.
4. Test before you commit. Slap a plate-sized patch onto the wattle and let it dry two or three days. Big cracks mean too much clay — add straw or sand. Crumbling dust means too little clay — add more.
5. Daub both sides at once, in pairs. One person each side presses handfuls into the weave so the two layers squeeze together through the gaps and lock like clasped fingers. Work from the bottom up.
6. Build up to about a hand-width thick, covering the sticks completely. Leave the surface rough — a smooth first coat gives the next coat nothing to grip.
7. Let it dry slowly — one to several weeks. Shade and moving air are perfect. Hairline cracks are normal; fill anything wider than a finger with fresh daub.
8. Finish with a thin smooth coat of the same mix with extra straw, or limewash if you have lime. Renew this skin every year or two and the wall beneath never wears.

Watch out

• Daub that dries fast dies fast. Hot sun or wind on wet daub means deep cracks. Work in shade; hang mats over a sun-facing wall while it dries.
• A wall with wet feet rots. Daub must start a hand above the ground, on a stone or timber plinth (a low base course), or earth wicks water up and the wall slumps.
• A wall with no hat dissolves. The roof must overhang by a forearm at least, so rain drips clear of the face. "A good hat and good boots" is the whole rule of mud walls.
• Too-tight weave snaps; too-loose weave sheds mud. The panel should flex slightly under your palm.
• Skipping the dung or straw gives a wall that looks fine for a month, then sheets off in slabs. Fiber is not optional.

How it works

Clay is millions of flat, microscopic plates that stick to each other when damp — that is the glue. Straw and dung fibers run through the mud like threads through cloth, so when the clay shrinks as it dries, the pull is caught by thousands of tiny ropes instead of opening one big crack. The wattle does the same job at a larger scale, holding the whole slab to the frame. Three sizes of the same idea: fibers hold the mud, sticks hold the slab, frame holds the house.