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I'm looking to build some relatively low traffic stairs for the side of our house, total rise is approx 600mm, width around 1200-1300mm.
The Peak Products Black 3 Tread Steel Stair Stringers look like a good solution but I'm trying to work out the most economic approach for the treads, but all the suitable timber treads (or timber of a suitable ~240mm width) seem pretty pricey: https://www.bunnings.com.au/240-x-45mm-1-2m-stair-tread-h3-treated-pine-domestic-use_p0090470
1. Any thoughts on most economic stair tread material?
2. I can't find a maximum weight tolerance for the stringers but I'm assuming they won't be able to take concrete treads...
Any suggestions appreciated!
Afternoon @kitfriendesq
Sorry Im late to the party 
Wasnt able to view notifications on the page 😕
I like the style of your steps that you mention at the start, I have looked at them for months as I tried to nut out what to do with the side of my house as well. The guys have supplied great information about them
So How about a differant step?
I have just finished building some gabion styled steps for the side of my house and they have hardwood stringers on them. Recyled old house studs to be exact.
I havent put together a project yet (Still need to sort the drainage in front of the wall and a couple of other things) but I used a custom gabion cage to make a form for the steps and then sanded back old hardwood studs for the treads. Yet to be oiled as only finishe dit on the long weekend.
You could go the route of two of these standard baskets side by side with a timber top but say a 30mm overhang goiving you a decent tread size.
Jack 650 x 300 x 150mm Black Rectangular Gabion
If you decide on trying that then I can tell you how to attach the timber to the baskets
Dave
Afternoon @kitfriendesq
hahaha love the puns!
The boss is always the final call Way too many times have I "discussed" stuff only to realise that the other halfs idea is a good one and I wasted a bunch off time 
Love alternate suggestions, they are at the very least helpful to solidify the path you want.
Dave
@Dave-1 absolutely - iteration and prototypes always improve things! Due credit to the boss she is normally right in the end also 😆
I did a partial prototype/option for her at the weekend based on some surplus blocks we had which was rejected as an aesthetic approach but was very handy to give her a sense of scale/volume:
Hi @kitfriendesq,
Unfortunately, the Peak stair stringers have only been manufactured for use with timber treads and are not compliant with concrete treads. I'd recommend you either go with the treated Pine or Merbau option.
Please let me know if you have any questions.
Mitchell
