topic Re: How to slope a roof 2 ways? in Revit Architecture Forum

How to slope a roof 2 ways?

dcsank — Tue, 29 Mar 2022 17:01:43 GMT

I need to slope a roof 5 degrees one way and 5 degrees the other. When I try to do this with define slopes, it creates a ridge or hip where the 2 slopes meet. I want the whole roof to continually slope in both directions. It has to be roof because its actually a canopy system and I'm using curtain walls and I need the curtain wall grids to still be 3' orthogonally apart from bird's eye view

Re: How to slope a roof 2 ways?

EATREVITPOOPCAD — Tue, 29 Mar 2022 16:53:54 GMT

5 percent = 0.6" / 12"

To do this do the following:

Architecture tab -> Roof button -> select level -> draw a rectangle
Select 2 of the lines and uncheck the Define Slope checkbox
select the lines you DID NOT select in the previous step, and enter a slope of 0.6" / 12" in the properties (It will change it into a fraction after you enter)

Re: How to slope a roof 2 ways?

dcsank — Tue, 29 Mar 2022 17:02:17 GMT

Yea this exactly what I did at first. It creates a ridge or hip where the 2 slopes meet (also 5 degrees can simply be entered as 5 in slope). So imagine a plane - I tilt it 5 degrees one way first then tilt the whole thing again 5 degrees in the other direction - this is what I'm trying to achieve

Re: How to slope a roof 2 ways?

EATREVITPOOPCAD — Tue, 29 Mar 2022 17:06:22 GMT

Ah I see, Thanks for teaching me about the % input never knew!

I would create an in-place mass (or a plane technically) and then use the roof by face command.

Re: How to slope a roof 2 ways?

dcsank — Tue, 29 Mar 2022 17:11:59 GMT

I think I just found out how to do this although the gridlines don't look precisely orthogonal. I followed a reply here: https://forums.autodesk.com/t5/revit-architecture-forum/roof-slope-in-2-directions-with-the-same-angle/td-p/8651215 with the crazy equation = 2*tan(8.0°)/SQRT(2) and I changed it to 5 degrees. Then I had to rotate the gridlines 45 degrees. Works but if someone else has a better solution let me know - thanks

Re: How to slope a roof 2 ways?

ToanDN — Tue, 29 Mar 2022 19:07:12 GMT

Create a bigger roof rotated 45 degree with one way slope, enter this formula to the slope =5*pi()/180*sqrt(2) , then use a vertical opening to cut it to shape.

Re: How to slope a roof 2 ways?

RDAOU — Tue, 29 Mar 2022 17:45:21 GMT

@dcsank

See GIF below

Use a Mass in Place >> Apply roof by Face

Re: How to slope a roof 2 ways?

barthbradley — Tue, 29 Mar 2022 18:39:38 GMT

You might have an easier go of it using the Roof by Extrusion Method. Food for thought.

Create a Roof by Extrusion | Revit 2020 | Autodesk Knowledge Network

Re: How to slope a roof 2 ways?

dcsank — Tue, 26 Jul 2022 15:20:46 GMT

I know need to slope the roof 5 degrees in one direction and 10 degrees in another. I still want to create the roof like I outlined in my last response but need a different formula.

Re: How to slope a roof 2 ways?

barthbradley — Tue, 26 Jul 2022 15:25:54 GMT

@dcsank wrote:
I know need to slope the roof 5 degrees in one direction and 10 degrees in another. I still want to create the roof like I outlined in my last response but need a different formula.

Can you be a little more descriptive? Explain what you are trying to do now. Maybe include some pictures.

Re: How to slope a roof 2 ways?

dcsank — Tue, 26 Jul 2022 15:33:11 GMT

I made exactly what I want in terms of sloping in a roof using simple trigonometry for inputs for the points below but this can't be changed to a slope glazing type. So now I need a formula that can do this to use as slope within the footprint edit tool

Re: How to slope a roof 2 ways?

barthbradley — Tue, 26 Jul 2022 15:49:16 GMT

@dcsank wrote:
I made exactly what I want in terms of sloping in a roof using simple trigonometry for inputs for the points below but this can't be changed to a slope glazing type. So now I need a formula that can do this to use as slope within the footprint edit tool

Within the footprint sketch? Why don't you make a parametric Mass to Host the Sloped Glazing to?

Re: How to slope a roof 2 ways?

ToanDN — Tue, 26 Jul 2022 20:38:18 GMT

@dcsank wrote:

I made exactly what I want in terms of sloping in a roof using simple trigonometry for inputs for the points below but this can't be changed to a slope glazing type. So now I need a formula that can do this to use as slope within the footprint edit tool

If you already have the roof above modeled, then simply create an in-place mass surface based in that roof, then create a curtain system by face from the mass surface. If you don't know how, share the file here.

Re: How to slope a roof 2 ways?

Sidetracked — Tue, 11 Jul 2023 02:27:49 GMT

A simple work around is to create a floor with the same properties, materials etc as the roof then use modify sub elements to add calculated elevations to the corner points.

Re: How to slope a roof 2 ways?

colinqBYUV9 — Tue, 11 Jul 2023 04:24:24 GMT

Simplest way by far is to include a slope arrow. No need for anything tricky, just need to know the pitch angle and the direction of the pitch.

Re: How to slope a roof 2 ways?

Sidetracked — Tue, 11 Jul 2023 04:41:50 GMT

Very hard to do with a slope arrow if you are wanting two different pitches and the roof is rectangular not square. Didn't realise but you can edit a roof the same way as a floor by way of modifying sub elements.

Re: How to slope a roof 2 ways?

SteveKStafford — Tue, 11 Jul 2023 16:52:18 GMT

Saw your replies and then realized this thread is almost exactly a year old 🙂 I was thinking the same thing with a slope arrow. I just experimented with slope values until the slope annotation reported 5 degrees (really 4.96 but rounded off). For a rectangular roof (not square) we'd just have to calculate the fall for each side that "mattered" and then plot out the slope arrow in the direction the roof would "fall". A bit tedious but doable.