How will solar panels affect my roof?
There are three main methods for roof installation in a domestic setting:
Roof integrated or 'in roof' - panels are mounted on PVC frames which sit directly on top of the inner roof surface, much the same as your slates or tiles. This configuration looks great because as it sits much more flush with the roof surface. It best suited to new roofs as once the frames are seated, a roofer can simply tile around the array.
Flat roof - There a numerous fixing arrangements for flat roofs. One of the easiest and most common method for installation is using panel 'bins'. These are weighed down with ballast and arrest the panels with fixings. The have a reasonably low profile and achieve the objectives in most cases.
Frame mounted or 'on roof' - in this configuration the solar panels sit on a frame, proud of the roof surface. The frame itself is attached to the roof structure by removing select tiles to gain a fixing point at appropriate intervals. This set up is more common in retrofit systems, where the roof is already tiled. It has the benefit of allowing good ventilation behind the panels - this assists with panel operating efficiency.