Mapelastic ? - Contractor Talk - Professional Construction and Remodeling Forum

joe dirt · 06-07-2009, 06:38 PM

Hi all, I am building a metal spiral staircase, treads are welded up 2" angle with thin plate welded in the bottom to make the pan, then filled the pan (1.75")with a Mapei product usually used for levelling shower floors.
The Mapei is developing hairline cracks above some of the supports(paper thin cracks) only on a few treads.
I plan to use Mapei Mapelastic on the cracks but I was thinking should I apply this to the whole tread (all of them) or just the cracks.
Any thoughts?
thans Joe Dirt

willworkforbeer · 06-07-2009, 07:35 PM

Quote:

Originally Posted by joe dirt

Hi all, I am building a metal spiral staircase, treads are welded up 2" angle with thin plate welded in the bottom to make the pan, then filled the pan (1.75")with a Mapei product usually used for levelling shower floors.
The Mapei is developing hairline cracks above some of the supports(paper thin cracks) only on a few treads.
I plan to use Mapei Mapelastic on the cracks but I was thinking should I apply this to the whole tread (all of them) or just the cracks.
Any thoughts?
thans Joe Dirt

So you used metal mesh too right? And what did you think was gonna happen?

joe dirt · 06-07-2009, 07:48 PM

No metal mesh, was told by supplier it was not needed, I am not totaly finished filling in the rest of the pans, mesh will be in the next flight.
My plan is to have no cracks in the substrate before I tile.

jarvis design · 06-07-2009, 11:04 PM

Are these interior or exterior stairs?

I would think you could use drypack to fill the pans, cover it with ditra and tile.