The bargeboards form the overhanging gables that protect your brickwork from rain and so they take the brunt of any bad weather.
UPVC bargeboards look like real wood and are fitted in the same way - using highest marine grade 314 austenitic stainless steel pins. It's reassuring to know that once you've replaced the wood with UPVC versions, you can practically forget all about them as they are virtually maintenance free.
The mortar above the UPVC bargeboards can often have deteriorated and starts to crumble and crack. If so desired this mortar can be replaced with a continuous dry verge that is designed to blend in with the roofing tiles and will never deteriorate like the mortar can.