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Unread 10-21-2021, 11:03 AM   #1
john619
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Location: San Diego, CA
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Exterior Stair Modifications

Interesting situation on this stairway. This is the main stairway as it exits this building. As people exit down the stairs they seem to become visually confused and think they are at the level of the driveway where they get picked up and dropped off. So when they encounter the curb (diagonal black and yellow striped) that is 10' beyond the bottom of the stair they trip and fall.

No amount of visual cues seem to alleviate the confusion. So we will be pulling that curb line back and create a new tread and riser incorporated with the existing run of stairs so they are now at the elevation they anticipate.

The existing material is flamed blue pearl granite 12x12's that I have convinced them that in no way can we just tile the new stair tread as that would cause similar visual confusion with a mismatched stair tread finish. So we will be pulling all the tile and re tiling the entire stair case. It is a concrete stairway underneath. I would like to propose using one of the metal stair nosing profiles with the VI striping incorporated. Anyone have a spec. that they like for the nosing? I will just pick a schluter that is appropriate for the tile thickness.

Any tips on specifying how the existing tiles should be removed and the concrete substrate prepared to receive the new tile? Also any recommendations on the mortar used to set the tile and the grout?

Not sure how to rotate the pics?

Thank you! John
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Unread 10-23-2021, 10:32 AM   #2
John Bridge
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Hi John,

I'm not sure what you are proposing. Are you going to jackhammer the entire lower landing to add the bottom step? Not sure what's going on here.

Removing tile from existing steps will entail the use of a demo hammer with a chisel blade.
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Unread 10-25-2021, 01:10 PM   #3
john619
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John, The lower landing is a 6" topping slab above the structural deck to the subterranean garage levels below. We can easily remove and create the last tread.

My question or concern is after the tile is removed would it be better to use a material to create a nice level and plumb substrate for a thinset application for the tile finish, or perhaps a mortar bed for the tiles to be set into and the level and plumb be established then. Open to either and understanding the proper products to be used for either method?
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Unread 10-25-2021, 02:10 PM   #4
John Bridge
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Mud is most always good, especially for the slope to the street. The mud itself would have to be well bonded to the concrete under it. I would use a modified thinset for that. Same modified to bond the tiles to the mud.
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Unread 10-26-2021, 10:32 AM   #5
john619
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Thanks John, What would be the maximum thickness that this type of "thin"set can be applied in this situation?

Also any advice for trying to find 12x12 Blue Pearl granite that is flamed or bush hammered or honed........anything other than polished? Seems custom may be the only option at about $30 SF
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Unread 10-26-2021, 06:09 PM   #6
jadnashua
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A bonded mudbed over a slab can go from zero to over a few inches. Outside, the surface would need to be sloped so it could drain, as the mud is porous. If the area might see ice or snow, maybe you could talk them into incorporating snow melt into that. Harder to do on the steps.
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