Several problems and potential code violations exist.

If your code jurisdiction has adopted the 2003 International
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 to
the thickness of the added laminate and also raise the upper landing
floor height an equal distance, your top most riser and bottom most
riser will exceed the minimum variation for risers in a set of stairs.

Added considerations are that the nosing must have a radius of
curvature no greater than 9/16 of an inch and a nosing shall be between
3/4" and 1 1/4" deep on all risers with solid risers.

It appears that any alteration you make to these existing stairs may
require you instead to replace the entire stair unit since the current
risers and potentially new treads will not meet IRC 2003 code. (Section
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 for
you at all.


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manhattan42
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