Concerns about a staircase...

[Cgong]

Conditions:
Simple staircase from one level to another, indoors. Width 1200mm, height 1000, max depth 1550mm. Lecablock.

Ideally, I want a 250mm tread depth, 167mm riser height, which results in a staircase with 5 steps. My problem is that lecablock are 150mm high.
Can I increase the height by 12.5 mm with, for example, a plasterboard (everything will be plastered) or another material, or should I go with:

6 steps. 250mm tread depth and 150mm riser height. Then the last step will be 100mm. The depth will be 1500.

This dilemma!

 

[Thomas_Blekinge]

Avoid having different step heights on the staircase, it's dangerous. Don't you have any vertical joints? Are there 75 mm lecablock that you can stack with joints in between so that it becomes 167 mm?

 

[Kane]

Conditions:
Simple staircase from one level to another, indoors. Width 1200mm, height 1000mm, max depth 1550mm. Lecablock.

Ideally, I want a 250mm step depth, 167mm step height which gives a staircase with 5 steps. My problem is that lecablock are 150mm high.
Can I increase the height by 12.5mm with, for example, a gypsum board (everything will be plastered) or other material, or should I go with:

6 steps. 250mm step depth and 150mm step height. Then the last step will be 100mm. The depth will be 1500.

This dilemma!

It will be 5 steps since the last step is the surface you reach? Thus, 300mm deep steps.

 

[Cgong]

It will be 5 steps because the last step is the surface one must go up to? Thus 300 mm deep steps.

 

[hempularen]

There is a stair formula that says 2 riser heights + 1 tread depth = 600 - 650, preferably 620 - 630. This provides a "comfortable" stair. Your measurements are a little on the low side.

 

[Cgong]

There is a stair formula, which states that 2 riser heights + 1 tread depth = 600 - 650, preferably 620 - 630. This gives a "comfortable" staircase. Your measurements are a bit on the low side.

Increasing the tread depth is no problem if necessary, I have 300 to play with in the first example.

 

[Cgong]

How about building with 150, leveling each course with leveling compound to the right height. Then I will also have the step leveled which I had intended to do anyway...