Yes, brick can breathe through limewash. Limewash is a breathable coating made from natural lime and water, allowing moisture to pass through while providing a protective layer. Unlike synthetic paints or sealants, which can trap moisture within the brick and lead to issues like mold, limewash allows the brick to maintain its natural breathability. This characteristic makes limewash an ideal choice for historic structures where preserving the integrity of the brick is essential.

You may not need a hammer drill if you’re planning on drilling one or two very small diameter holes in brick. For holes with a diameter of 3/16-inch or less, a regular drill with a masonry bit can do the job. However, the bit will heat up quickly, and the process will take significantly longer than with a hammer drill. Prepare to cool your drill bit down in a bucket of water more often.

The material you use depends on how hard-wearing your steps need to be and what you want them to look like. The most common stone for exterior steps is bluestone. It’s hard-wearing and durable, and bluestone steps cost between $15 and $30 per linear foot. Limestone is also a popular option and is mid-range, costing $25 to $50 per linear foot. You should always consider the specific requirements of your project before ordering any materials.

It is possible, albeit a lot slower, to break up a rock using water. You would do this by freezing and thawing the water. You could create some initial holes or cracks in the rock, then pour water into the cracks or holes and allow them to freeze (so it's best to do this in winter or in colder climates). Since water expands when it freezes, this puts pressure on the inside of the rock and causes it to crack. You could continue to pour more water in and let it freeze to continue to break up the rock.