I have an old duck pen that is constructed from 2 cattle panels formed into a vault. Over that there is hardware cloth. The base is structured from wood, as are the ends, which are made from hardware cloth.
Long story short, the ducks haven't used this in years, and I am now in need of a goat buck shelter. This would be great to convert into that goat buck shelter, and it seems like the fastest and most attractive and durable means to do this might be to wrap it in fabric and coat it with an acrylic cement coating. I would (at least temporarily, if not permanently) add some support beams on the interior to help hold the roof up. Everyone seems to use wood for these hypar structures and seems to use a more linear shape. Anyone use it with a vault? Anyone use it with metal instead of wood or bamboo?
Abe Connally and Jefferie Walters are the guys to ask.
Mr Walters has posted a lot about the arched roof of his cottage. I believe he used ferrocement techniques, which are similar to the technique you are asking about.
Mr Connally has used the acrylic cement technique as detailed here.
Structurally that's a verysimple span, especially with the end walls done up. Prop a ridgeline up for the wet mud and give it a good week before removing. The longer you prop and proper cure the better obviously. The closer to catenary the stronger, but it ain't that important with your spans for goats. I've done less radius than your Roman arch at 20' span, simple Hardware cloth and Cattle panel armature. Bomber strong.
If you go Without the end walls, I'd thicken the edges. But you could easily do end walls and just frame out doors incase you want to close it up. It'd be more versatile.
You could hypar, but I find it more expensive for me locally than good FC even when buying mesh. I also find it slower. For FC, I suspect you'd need 3-4 bags of fresh cement and then have 30 gallons mason sand (redi mix or maybe pit) per bag. Haul in pickup.
And you already have the best mesh to use installed. This fc will handle goat impacts, kicks, playing better than hypar too. Hypar over this doesn't use the metals potential.
Hardware cloth (I like 1/2" best...) and cattle panels are my preferred armature for FC vaults. And you already have some installed. An inside lath layer (4 sheets per panel is perfect for $20 52"x16' panel, wired tiiight to panels would make a nice mesh system for your project. Stucco netting or lath also have their places in FC.
The drier the mix the stronger and more water proof, but harder to apply.
That could handle a FC footer. Or tie pounder t posts into the inside corners. Or some simple deadmans buried. FC won't fly away or flex in a vault like hypar in the vault shape.
2.5-3:1 mix for fc
If you are in a wet climate with freeze thaw cycles, add a sealer before winter.
Have fun. You may like it enough to drag it out of the pasture for a studio, just a warning.
posted 4 years ago
Well, I ended up doing something between the method on the Velacreations site and standard hypar. I wanted to be able to use the cattle panels to hang buckets and such from. My goats are Nigerian Dwarfs, so they are not big or particularly rough and tumble -- for bucks anyway. I'm happy to have been able to re-purpose the duck shed, and we will see how well it works. Because of the how the shed is located, the bucks won't have access to the exterior of it -- at least not the three sides that are a hypar hybrid.