Reflective radiant heat barriers make a big difference, as does more insulation. I think that they are both pretty cheap in the grand scheme of things.No radiant barrier. I thought about it, but I have a solarroof and am worried about cooking the underside of the tiles and wires.
I think a part of the issue is we have very few intake vents, a dozen or so 1" diameter holes on each side's eaves, so I am looking into increasing those. We also have a 2' X 3' gable vent on each end of the main roof and I may also add fans to those.
You might want to check your local fire regulations on roof vents before changing them. The new norm is for much smaller vents due to the fire risk. As Santa Rosa demonstrated, wind does a good job of moving fires through suburbs, and a common route is through gable and roof vents. If you do change it, the current recommendation is for baffles (to block wind driven embers from touching the screens) backed by steel mesh with openings not larger than 1/16" (~200 mesh). We redid our roof recently, and the ventilation was completely redone with much smaller vents.
Nice guidance here; Vents - FIRESafe MARIN and
Don't forget that the radiant heat barriers can have a negative impact on cell phone signal transmission, depending on where your towers are.
All the best,
BG
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