New stair project, possibly single stringer staircase|Page 3|Forum|WOOD DESIGNER

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New stair project, possibly single stringer staircase
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Stuart Lees
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February 28, 2020 - 4:41 pm
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…when talking below, about the top connection of the stringer to the first floor, I should have explained that the stringer will be connected to a beam 254mm deep, not to a wall.

-Stu

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Stuart Lees
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February 28, 2020 - 4:23 pm
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Hi Michel

Thanks for the information. I’ve made some modifications. Could you check it over for me please?

I have quite a few questions, but I think then I’m pretty much done!

The plan has a circular flight, right radius 10mm, centred on a 100mm newel post with two 50mm hand rails joining onto it. I set the offset by eye, so it looks right. Is it possible to set the co-ordinates so the post is exactly centred on the circular flight?

I set the newel posts so their bottoms are flush with the underside of the steps, the balustrades so their outer edges are flush with the tread edges, and the risers flush with the tread edge. Does this provide strong enough joints?

Is there a control for the gap between a newel post and the first banister? I wanted to position the newel posts so they replaced a banister, leaving the gap between the newel post and the first banister equal to the gap between all the other banisters, but I always seemed to get an extra banister with a narrow gap between it and the newel post.

Do you think the top of the stringer is still thick enough to provide a strong connection with the first floor? What size bolts do you usually use, and how many?

The house has not yet been completed. When I get it, the ground floor will be a concrete slab that I will build up with 200mm of screed and the final floor finish. If I set bolts within the screed, and bolt through the stringer beneath the first step, do you think that will provide a strong enough base? How many bolts?

Does the horizontal laminates technique work ok for a curved hand rail 50mm x 60mm?

I’m planning to make the stringer from plywood. Any problem with that?

I need to keep the costs down as much as possible. What sort of timber would you recommend for the treads?

Regards

Stuart

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Michel

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February 20, 2020 - 7:00 am
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Hi Stuart,

for some rules, you will have to check the building regulations in your area and adapt the stair design accordingly. This information I don’t have. So get a hold of these regulations. 

The step thickness I would go for a minimum of 35mm to 40mm.

The landing step can be removed but I do not see any reason for it as the stair rules comply. The stair is ok.

You can end a handrail by adding a post along the stairwell and remove the cut handrail or if you want to end without a post you need to double click on the stairwell edge to enter the editing mode and then add a point with where you need it to end also with a double click. Then select the handrail and go to modify and you should be able to ungroup the handrail and it will be cut on that specific point. The part you don’t need you can delete it.

For open tread gaps, you can add a riser and restrict the height of it by setting the parameters in the property window. Open the step parameters and select yes for the risers. This opens the riser parameters and you can set the upper offset which indicates the penetration in the step and the lower offset with a negative value which will create a restricted riser. In your example, you can set -110 to see what it does. There are also other parameters but they speak for themselves so you can set them according to your needs.

regards

Michel

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Stuart Lees
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February 19, 2020 - 6:56 pm
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Updated file

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Stuart Lees
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February 19, 2020 - 5:48 pm
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Hi Michel

Don’t know why I didn’t notice the cutstringer could be set centrally. Getting there now! I notice you set the cutstringer slightly off-centre: Was that intentional?

Having done some research, I realise that my design is a long way from building regs for a main stair, so I’ve had to make some adjustments. Can’t see how I can realistically use the horizontal rails, though I like the look of them a lot more.

How do I end handrails before the end of a flight, please?

I know the open tread gaps are too large for regs. I thought I’d give the topmost laminate on each step ‘wings’, to block them off partially. Is 30mm a standard thickness to provide the right rigidity for these kind of steps?

Apart from the missing risers, can you see anything else that would be an issue for regs? (The stair will be alongside a wall where the handrail is missing on flight 3.)

Is there a regulation for how wide the step must be on the inner edge of a turn?

I see you added the top landing. I guess that was so there’s a thick top section of cutstringer to attach to the first floor. I’m very tight for space. If necessary, do you think I could remove the landing completely, and replace the top section of the cutstringer with a vertical steel plate to bolt onto the first floor?

Any suggestions for improvements would be welcome!

Thanks

-Stu

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Michel

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February 18, 2020 - 7:31 pm
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Hi Stu,

There is no need for 2 files. You can just set the central cutstringer as I did in your stair attached. The 2D DXF can be used to create the horizontal laminates templates.

Regards

Michel 

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Stuart Lees
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February 18, 2020 - 12:05 pm
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Hi Michel

Please ignore my earlier replies on this thread from today. The file I uploaded was the wrong one. If you could take a look at these instead, that would be appreciated.

StairCS is my StairDesigner stair that I’d like to use with a central cutstringer. Do you think that’s ok?

The ‘Stringer’ file is an experiment to see if I can draw the stringer in StairDesigner (based on a 300mm wide central stringer). I was thinking, if I output this as a 2D DXF I can edit it in CAD to get the cutstringer elevation and plan. Is there a better way of doing this? What cross section dimensions would I need for the stringer?

Thanks

Stu

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Stuart Lees
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February 18, 2020 - 10:54 am
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…should have mentioned: I’m thinking of open tread, but I need it to pass UK building regs.

-Stu

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Stuart Lees
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February 18, 2020 - 10:50 am
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Hi Michel

Here is my StairDesigner file. The stair is not intended to be attached to the walls, only the top and bottom. I’d like a central cutstringer.

Thanks

Stu

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Michel

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February 18, 2020 - 6:00 am
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Hi Stu,

Do you have a current stairfile you a working on? Please provide it to me and I will have a look at it to see if the stair is ok. If you have specific demands that you cannot achieve in stairdesigner post the questions with the file and I will revert shortly

regards

Michel 

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