Salt and iron are pretty good for housewards, though in my experience basing the wards around a living tree is best. On the other hand that is how I do, because it suits my style. Some people use a stone or a carved or painted icon of some kind - depends on culture/religion/magical system involved. Many cultures also use salt water, holy water, light, fire or sacred herbs to make a boundary or barrier. I’ve even seen copper wire used.
One pattern I have found useful for both personal and area protections is very simple. Not sure if it could be properly called a spell, more like a meditation/concentration exercise. What I learned to do was to first find the spot where my awareness of self is based in my body. For me it is within the body, around the solar plexus, for many people it is in behind the eyes, or in the heart, throat or base chakra areas. For a few it seems to be under the feet, or even outside the body or floating above the head. Varies vastly from person to person.
Once you have determined the location of that point of self-awareness, the usage I learned was to picture a small bright light there. Some people use a flame or spark image, I use a small white star. Once you have that well pictured, expand it out, evenly in all directions, until it reaches a natural boundary, pushing out ahead of it anything dangerous or unwanted (some use this method to control and cast out rage or fear as well as things from outside yourself). Again, this varies among individuals. Mine is roughly me-shaped and a few inches outside my skin. For some folk it is a glowing sphere yards across, for some it stops at the skin. Once the shell of light reaches that boundary, tell it to stabilise there and reflect any dangerous or hostile energies. If you want to strengthen the protection, send out more shells of light to reinforce it.
Simple and not requiring a lot of equipment and fuss.
Also meant to mention about the rain calling we did last week: small success, several small sprinkles of rain that night and early the next morning. A bit cooler and lower winds than had been expected. Not a huge result, but some. Mind you, there were only three of us plus a few old trees. Me, the marngit friend I mentioned, and a Buddhist nun. Each of us worked in our own style of invocation or prayer, doing what we could to reinforce the other two as they were working.