Stair Run Depth is Changing when i adjust Nose Shape .

[essam_rashad]

The stair im currently working at have slanted nose with specific profile , so i did the profile and changed the Stair so i realized that thickness of run has changed from what i assigned ( i made it 300mm but once i make the nose slanted its changed to 316mm ) plus the built in parameter Nosing Length is not clear what does it changes , it seems to change my profile each time i adjust the value , can someone help me with this , thank you in advance .

[jay_colcombe]

Is this because the slanted parameter is ticked therefore the position of the thickness gets altered because the parallel lines for the thickness element are adjusted to reflect this?

Nosing adds additional thickness to the tread and this is reflected in the chance of value but agree should not!

The stair is made of multiple different element so you may need to edit the Tun element and duplicate it to ensure the setting are kept for that element.

unfortunately I am not at my PC but will take a better look when back

[essam_rashad]

Am i thinking with you? or you are answering me 😂 anyway i unchecked slaneted paramter now and nothing changes .

[jay_colcombe]

I assume then the thickness of the waist is based on the concrete elements for design purposes but when nosings are added this can increase this.

I would also check the profile to see what gets added in regards thicknesses etc.

[essam_rashad]

so what you suggest the solution is? i tried a tricky solution and its to decrease run depth until it reaches 300mm xD but as a way of modeling its not correct because its like 285mm but visually 300mm .

[essam_rashad]

Any one else can help with this issue?

[jay_colcombe]

I used the OOTB Monolithic Stair with the default 25mm Nosing Run Type

I duplicated the Monolithic Stair and renamed it to referenced slanted so it is now its own Type

Within that Stair I also Duplicated and edited the Run Type 25mm Nosing also to reference Slanted so again it is own Type

As you can see with BOTH Types the waist remains at 300mm so as previously suggested this possibly is related to the User-Defined Profile directly!!!

In the Run Type if you change the Nosing Profiles this still does not influence the waist

So I can only suggest it is related to the Profile Family or the dimensions are not correctly picking up the waist thickness - use the Tab Key to pick a node

Then the bottom underside face

[essam_rashad]

i dont know how to thank you to be honest 😅 last thing if u could help me with , this is a photo of the profile family , what possibly could be wrong? 

[jay_colcombe]

I think the issue here is if you have it Slanted it takes the Profile inside the Slanted part of the stair.

Without Slanted the Profile is applied you then need to adjust the Nosing Length to take into account the offset!

This is shown when using the default OOTB Profiles - Nosing Length 20mm

Nosing Length 10mm (20mm Radius Profile)

[essam_rashad]

i agree but in my case nosing length is equal to 75mm which is profile width so when i apply 75mm it changes the depth of the stair , its stubborn problem so im sry that iam exhausting u with it 😅

[jay_colcombe · Accepted solution]

This is because your Nosing is being incorporated onto the Tread and added within the Width/Waist of the Stair 

When the Nosing is less then the Riser Height you can still pick the waist

When greater Riser Height is the contributing factor here as it defined the Stair Height and number of risers required

I would suggest the biggest issue here is you are trying to cut come of the Tread away and this would not be possible in Revit using the Stair Tool so you either will have to adjust the waist inline with you profile or draw the Stair as a Model In-Place components as an extrusion