Several problems and potential code violations exist.
If your code jurisdiction has adopted the 2003 Internationa Residential Code you are required to have:
-A maximum riser height of 7 3/4"
-A minimum tread depth of 10"
-A variation between riser heights no more than 3/8th inch
At issue and potential code violations will occur because: A) Your existing stair will have exceeded maximum riser height B) Unless you also raise your lower floor landing by an amount equal t the thickness of the added laminate and also raise the upper landin floor height an equal distance, your top most riser and bottom mos riser will exceed the minimum variation for risers in a set of stairs.
Added considerations are that the nosing must have a radius o curvature no greater than 9/16 of an inch and a nosing shall be betwee
3/4" and 1 1/4" deep on all risers with solid risers.
It appears that any alteration you make to these existing stairs ma require you instead to replace the entire stair unit since the curren risers and potentially new treads will not meet IRC 2003 code. (Sectio R311.5.3 Stair treads and risers.)
Check your local code juridsiction before proceeding.
The information you have been given to date may not be permitted fo you at all
-- manhattan4
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