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They strip my roof and fitted new battens/felt when they fitted the panels, even if you just had a new slate roof fitted they would still do that. If you had the panels fitted over your current slates (which i wouldn't recommend) they can attach the panel supports to the main joists of the roof which will be solid.
Leaving aside the fact that i wanted integrated panels from the start. It actually worked out cheaper to have the roof stripped and panels fitted (not counting panel costs), than it did to have the roof strip and redone in new tiles, let alone panels then added on top.
I wouldn't worry about your house being east/west as there are advantages to that (assuming you have the roof space) as you will get solar generation through out the day and more of it when you need it, just to a lower level at any one time.
Mine face due south so I get little power in the morning and evening when I want it the most, where as an east/west setup would give me more power then when i wanted it the most. OK i have battery storage so it doesn't much matter, but if i didn't then i would personally prefer an east/west setup |
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