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Can anyone explain why you need to remove mortar / undercloak when fitting a dry verge?. Is it because of ventilation (Why if the ridge is currently mortared and ventilation is not an issue) or to fix the dry ridge (into mortar, but if the batten is behind it it will be secure using suitable...

I'm going to be painting over a number of door frames and skirting boards painted either a mid-grey or dark red gloss by the previous owner. I want to paint these white. I'm not too fussy about what type of paint to use but I want to buy paint that's suitable - presumably an undercoat and at...