Backfill for building garden steps

C

Charlie Lockhart

Member
I am building some garden steps, but I am not sure what is best to use to backfill them. I don't know if it is best to backfill using MOT Type 1 or a lean concrete mix.

The walls/risers for the steps are built out of concrete block and cobblestones. The height of the walls of each step from the foundation is roughly 24cm. I will be laying porcelain slabs for the treads.

Any ideas?
 
I would go with type 1 to a level of around 60mm below finish and then top off with lean. Slabs can then be bedded onto mortar .
 
Mark DM said:
I would go with type 1 to a level of around 60mm below finish and then top off with lean. Slabs can then be bedded onto mortar .
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Thank you for your reply. I was wondering why you recommend doing it this way? Does a concrete provide a better base to lay porcelain on than MOT Type 1?
 
Cheslea2010 said:
Type 1 is quicker and cheaper but if your happy to go down the concrete route that will also be ok.
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Thanks for your reply. I wondered if a concrete backfill might trap moisture underneath the porcelain slabs. Especially as I had intended to back fill just below the the top of the walls of the steps, so as I can achieve a reasonable depth of mortar when laying the porcelain slabs.
 
For backfilling garden steps, start with a layer of gravel or crushed stone (3/4-inch) for drainage, compacting as you go. Add a layer of coarse sand if needed, then top with good-quality topsoil for planting, leaving a gap from the step tops. Use a drainage fabric between layers to prevent clogging. Ensure proper grading so water slopes away from the steps. Compact each layer to avoid settling and ensure stability. Water lightly after backfilling to help settle the soil.
 
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