When solar panels are fitted the mounting brackets for the rails are slid up under a tile and then pushed through the underfelt and screwed to a truss. This will cause the tile to be lifted slightly.
Underfelt is fitted purely to stop draughts that will come from between the tiles. Providing the tiles are in good order no water should come through. Severe wind may push some rain upwards from the lower tile edge. The underfelt will keep that out of your loft space but it will be minimal.
I'm presuming the holes and daylight you can see are on the lower edge of the tiles?
Shes right dust from the tiles may blow through the holes in the felt.
I wouldn't recommend that blown foam as an insulator that sticks to the underside. But I'm not an expert. The roof need to breath.
You could try some black roofing felt and fit it a bit more tidily around the brackets and stick it with some proprietary adhesive. Basically you are trying to repair the underfelt. New roofs have a white breathable membrane now which allows the loft to breath but keeps out moisture (and dust :) )
MD beat me too it but he explains it well. Trouble is I'm going to need a new roof now :
Last edited by: Fullchat on Sat 3 Jul 21 at 20:16
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A roof question 
A roof question 
