What I am saying is that because of the potential trip hazard presented by the threshold in the door way your top step must, in effect, be a landing or "safe area" where a user can pause. Ideally this requires a width of 900mm (front to back), or in any case at least 600mm, and at the same height as the top of the threshold to minimise trip risk. This is called design, and it isn't just a case of blindly copying what is already there. If you don't have that "safe srea" you are creating a trip risk for an elderly person, and a trip at the top of a flight of steps isn't going to end well for them (or you as you could be found to be negligent)
I smashed myself up on a motor bike many years ago and for quite a while I had to wear a brace on one leg. That taught me first hand about mobility issues, and the need to design with due diligence for the disabled, elderly and mobility impaired. If you cannot understand this need turn the job down and walk away - if you get this one wrong you could end up injuring someone, or worse
BTW 6ft wide is too wide.. Elderly people potentially need to.be able to get 2 hands on rails - look at your own stairs at home. Like as not they will be 900 to 1200mm wide
Thunderbolts are a one time fixing. They were never designed to be screwed in and taken out repeatedly (they can fail quite quickly). We only ever use them for vertical fixing due to problems there are calculating/testing pull out loading (when scaffies use them they are apparently required by law to test and periodically retest them). Resin anchors are far better but can be problematic in a single skin of brick making a vertical fixing into a concrete block or pad much safer
Ok. Thxs. So no concrete base means hard to vertically fix base and hard to get two
handrails fixed strongly too so not safe. They're not that elderly- sixties but ok. Thxs for this