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The well opening
In order to access the upper floor, your new spiral staircase will either pass through an existing well opening in the floor or you will need to form a new one. In either case, two key dimensions will be used to specify what staircase components you require.
The instructions below explain how to take these two critical measurements.
Firstly, measure the width and depth of the opening as shown (Fig.A). We offer two diameters of spiral stairs; 1400mm and 1600mm. Your well opening will need to be a minimum of 50mm larger in both directions (ie. 1450mm x 1450mm, which is the minimum for a 1400mm diameter flight). It may be that you will need to extend your current well opening.
Secondly, measure the floor to floor height that the staircase needs to rise, this is known as the total rise of the flight. Be careful to measure to the finished floor level of the upper floor, as you will want the landing platform to sit flush with any floor covering you may be intending to use (Fig.B).
You now have all of the measurements you need to work out your component requirements.
Treads and risers
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The next step in working out your component requirements is to decide how many treads you require (this is done by deciding on the quantity of treads that gives a suitable rise).
Each tread/landing platform can be adjusted to give an individual rise of between 200 and 220mm, which is within the range allowed by the UK building regulations. To avoid cuting balusters, ideally you would want to stay between 210 and 220mm.
To work out the number of rises needed, take your total rise measurement and first try dividing it by 12 rises, a common number for UK stairs. This calculation will give you the individual rise which needs to fall between 200 and 220mm (but ideally 210 and 220mm as previously mentioned). If it does not, then adjust the number of rises until it does.
You may well find that there is more than one possible solution, ie. 2600mm overall rise divided by 13 rises = individual rise of 200mm, or the same 2600mm overall rise divided by 12 rises = individual rise of 216.6mm. Both are acceptable falling between 200 and 220mm, however a rise of 216.6 would be the prefered solution in this instance.
Once you have calculated the number of rises that suits your situation best then you'll know how many treads you require. THis is one less than the number of rises, as the last rise is accomplished by the landing platform. So for a 12 rise flight you will need 11 treads plus a landing platform.
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Access to the first tread
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The final step before making a list of component codes required is to check that the first tread will be in a position where access to it is unimpeded. Use these drawings to help. These staircases can be installed clockwise or anti-clockwise, however this will have some bearing on the entry point.
Start from the landing platform at the top and count back down the flight the relevant number of treads to see where the entry point is. Make sure that the entry is clear and unimpeded. If it is not you have 3 ways of altering the situation.
- Change the position of the landing platform. This is obviously easier where a round well opening is being used, as more flexibility is available. With a square platform, you will only have 4 options.
- Consider installing the staircase anti-clockwise instead. This will usually alter the entry point.
- You may be able to adjust the number of rises (remember that there is often more than one solution to this number), which will again alter the entry point.
Using one or more of these methods, it is normally possible to work out a solution. If you cannot find a solution then please contact us and we will be pleased to help.
Once you have finalised the number of treads and the configuration of the staircase, you are ready to specify your components.
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Component selection system and order form
Note:
UK Building Regulations require that: "All stairs which have open risers and are likely to be used by children under 5 years should be constructed so that a 100mm sphere cannot pass through the open risers." An optional bracket is available to achieve this (SSBRP) if necessary. Riser brackets are supplied with the appropriate fixings.
Component selection
This unique system is a set of standard stock components that can be used to complete your instalation. Each stair consists of a maximum of 2 product codes with additional landing balustrading components available.
Primary pack
- Centre post
- 11 treads
- Universal landing platform
- Flexible handrail
- Spacers
- Balusters
- All appropriate fixings
Tread pack
The tread pack is an optional item which contains 1 additional tread with its balustrading. It is used to increase the height of a flight where the standard treads in the Primary pack cannot reach high enough. Up to 2 extra Tread packs can be used with a standard Primary pack.
Specifying your components
- You will require 1 Primary pack. Select the correct diamteter and model type for your rquirements from the list oposite.
- With the Landing platfor and Primary pack, you have a total of 12 rises which will achieve a maximum floor to floor rise of 2640mm. The last step is to add in the relevant number of additional Tread packs. So for a 14 rise flight, you will need 2 additional Tread packs in the correct diameter and model, to acheive a maximum floor to floor rise of 3080mm.
- Finally, specify the landing components required using the final section of the installation instructions on the installation page, to decide what you need.
Note:
Minimum floor to floor measurement for these staircases is 2400mm.
Recanto timber centre pole spacers
As an option, the Recanto can be fitted with timber spacers, replacing the balck items. Timber spacers can be ordered separately and are available in 200mm lengths which need to be cut to size to suit the individual rise. You will require 1 spacer per tread and landing platform, plus 1 timber base plate.
Note:
These are large diameter tubes designed to slide over the centre pole. They need to be cut perfectly level, which will require professional equipment. |
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