learner

Hi All. Im sure this has been asked but what is the remedy?? My dad has many m2 of treated decking that he has painted. It constantly get to slippery to walk on for him and my mum. What product should he buy and how should he use it. he is about to redo the decking and his advise costs £600 for undercoat and non slip paint but im sure this is the same as he done before(he is very old) Is bi Carbonate of Soda the key and when should he use it or shall he just repeat with non slip paint from scfx and the like?? He is a very experienced DIYer, this is the only problem he has never fixed.. Any advise is good..

It has a DPM i can see it and i will be insulating the entire house floor once finished.

Hi This my 1st building project so i need advise please. I intend to build a sips panel single storey extension of around 20m wall length. The floor level of the house is around 500mm above ground level. The previous owners had already added a concrete base at that height so i want to add to that (3m x 5m). The concrete i will either have poured or do my self depending on price is 1.8m x 7.7m x 500mm= 6.93m3, half is on grass and half is on concrete. The new concrete will but up against the other concrete and an external brick wall. Will i need expansion joints? How much is the concrete? Im sure i will have more questions but first things first. Thanks