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The ideal amount of mulch is the square footage of your desired depth in inches divided by 324. Aim to keep your old and/or new mulch at a depth of no more than three or four inches.

Topsoil should go down first. If the topsoil is next to your house, make sure the grade slopes away from the house to keep water from pooling against your foundation and possibly leaking into your basement or crawl space. Don’t cover your decorative landscape mulch with topsoil as that defeats the purpose of laying down the mulch. If you’re trying to create a certain soil composition to improve plant growth, you’ll likely want compost mixed into the topsoil instead of mulch. Over time, any decorative wood mulch will simply decompose under the topsoil.

Many ways to landscape a steep slope on a budget exist. Avoiding expensive retaining wall construction is the first step. Consider creating a rocky slope with boulders or large stones, or think about planting perennials that return every year with a single investment. Transplanting small trees from elsewhere on your property is also possible and can help to stabilize steep slopes without purchasing new ones. 

Yes, rubber mulch allows water to seep through and reach the soil underneath. Rubber mulch is not as absorbent as organic mulch, which allows the soil underneath to stay moist and hydrated. Keep in mind that the permeability of rubber mulch can get clogged by landscape fabric and other additional materials.