BS 5395-1:2010 pdf download

BS 5395-1:2010 pdf download.Stairs -Part 1: Code of practice for the design of stairs with straight flights and winders.
5.7 Stair clear width
The stair clear width, particularly for private stairs, should be sufficient to enable occupants to move readily up and down, and also allow for the movement of furniture and equipment between floors. The values given in Table 1 should be regarded as an absolute minimum.
NOTE Attention is drawn to requirements for the stair clear width of
escape stairs specified in building regulations, Buikiing Regulations for
England and Wales, (21 The Buikiing Regulations (Noxthern Ireland) 131
The Building (Scotland) Regulations 141.
5.8 Landing
The clear width and length of all landings should never be less than the stair clear width, and should be sufficient to allow for the movement of furniture and equipment. The landing at storey level can be formed by the floor of the room into which the stair opens.
6 Durability and materials
The materials and the standards of workmanship should conform to the relevant British Standards for the appropriate products.
NOTE I The Bibliography lists relevant constructional design standards This list is not exhaustive.
The material selected for stairs should be able to withstand a considerable amount of wear and tear, and also a degree of abuse.
In public areas such as shopping precincts, stairs can be subjected to abuse and vandalism. For this type of apphcation, the design should be robust, and particular attention should be given to the fixing down of finishes and to the design of stair balustrades and handrails. The design should allow easy replacement of damaged components, in a manner that minimizes the risk of theft and vandalism.
The anchorages and fixings of the stair balustrade are liable to structural deterioration with the consequent risk of failure or collapse. The structure and finishes should be selected to limit the risk of decay and corrosion.
To avoid early failure of the finish, the choice of finish and the position and detail of joints should allow fo the rigidity and likely movement of the supporting structure. The materials should be sufficiently resistant to deterioration and wear, with respect to the conditions to which they are subjected and the intended life of the stair.
NOTE 2 Guidance on the risk and effects of condensation on building structures Is given in 855250.
7 Slip resistance
COMMENTARY ON CLAUSE?
Slips on stairs occur in both ascent and descent, but a slip on descent is more likely to lead to a fall and an injury Research has shown that slips while descending stairs are more likely to occur when the user oventeps, placing only 50% to 60% of their foot on the tread. The likelihood of an overstep decreases significantly with increased going size, and beyond 300 mm, is very rare. Beyond 350 mm, it is unlikely that a large overstep will occur within the lifetime of the building, even with 2000 users per day.
As the going rs decreased the likelihood of a large overstep vn descent increases, as does the risk of a slip. The size of overstep required to generate a slip appears to be related to the slip resistance between the surfaces of the tread and footwear of the users and also by the presence of liquid or dusty contaminants on the treads or footwear soles Howevec with a large enough overstep a slip can be generated in descent even if the slip resistance is high and the conditions are clean and dry
Under normal walking conditions (minimal overstep) slipping on stairs is less likely than slipping on the level. This is because most slips on level ground occur between shoe heel and floor and are initiated because there is sufficient horizontal force to overcome friction. But when going up or down stairs, the sole of the shoe makes the first contact often with the nosing, and the speed is controlled by the size of the steps.
Treads and landings should have a surface (and proprietary nosing, if provided) that does not become slippery in use.
Assessments of slip resistance should be undertaken using a combination of the following:
a) Pendulum test values (PTVs) obtained using a pendulum tester in line with BS 7976-2w and
b) surf&e microroughness measurements using a stylus instrument in accordance with BS 1134-1.
NOTE I Attention is drawn to the information found in the UK Slip Resistance Group Guidelines.
NOTE 2 Any flooring material providing sufficient slip resistance for use on the kvei typically With a PWgreater than 36. is suitable for use on stairs.
Ply should be measured In the conditions to which the stair Is likely to be exposed.
NOTE 3 Ex-factory materials used to manufacture treads and nosings can be assessed in this way.