Hi, the walkboard has two large G-Clamps holding it to the frame underneath so no chance of slipping, but you are right the walkboard should be locked down. The ladders weren't Ideal but had wide feet for stability and I only had to go up 2-3 rungs to paint the fascia board which was a 15 min job. The painting of the wall etc was standing on the walkboard.
We had stablisers on the opposite side to the poles on the conservatory so it was rock solid, even used a spirit level to get it bang level.
While on the point of H&S, the suppliers said there were instructions for construction of the tower. I expected a leaflet from the delivery man, what they meant was, there were instructions stuck to the tower as a sticky plastic label that was damaged and almost unreadable, so I wasn't impressed with that. Anyone who had never put a tower up before would have been scratching their heads.
There is no featured way to fasten that board to the floor or frame that is supplied with the tower but as a H&S issue there should be. As an extra measure we also braced the board with wood to the right side. The mere fact I had to do this shows a flawed system in any tower supplied and should really be addressed.
I took the picture after I had finished using the small ladder and had removed the wood support but still had the g-clamps in place.
Drilling the wall was not an option.
The render is done and should last for many years to come, the paintwork i.e. fascia, and sills will likely have to be painted in the next 3-4 years, maybe even sooner as the back is south facing and gets a lot of sun and even with 3 undercoats and a gloss topper I can't see it lasting more than 3 years before it needs repainting but I will be checking it annually before it starts to crack up.
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