The paint on our rendered brickwork bubbled badly in damp weather we have rubbed this down and applied a fresh coat of paint this has now also bubbled can anyone advise why and what to do.

The render is damp. Identify source of damp.

your problem is damp penetration..solution is find the entry point and treat.scrape back all loose flaking around the area until you reach a firm surface allow to dry out completely then apply a masonry sealer and paint over as normal

Try sealing the wall prior to painting.

Power jet/Wash the substrate "wall" thoroughly with a good strong liquid or detergent, let dry, rinse, let dry, Sandex sealer, will then prepare the surface for you to continue painting, maybe use sandex again. This is more than likely the reason behind bubbling, poor preperation. Go to www. sandexpaints.com for all info ,products and data Good luck sir

remove all paint and use lime wash instead. also sort moisture problem in the wall

same as above, would be looking at the guttering ,roof, any windows that are in that wall or pipes, locate the sourse of the damp and you will solve your problem.