luis_pr said: It is unclear which type of hydrangea you are referring to. You could plant a climbing hydrangea if it has a rough wall surface to climb with its aerial rootlets; no trellis needed normally (use it on smooth surfaces) but you may want to periodically monitor growth and forward it towards a direction that you approve of. You can also plant a standard panicle hydrangea that is grown as a tree. A Grandiflora or Limelight panicle tree, for example, would grow above your windows and well into the attic at maturity. If you ever use a trellis, ensure it is not made of wood as climbing hydrangea can exceed 80 feet high or wide and will grow for decades, well above the life expectancy of a wooden trellis.
Almost more importantly - what direction does your house face? Hydrangea peteolaris prefers north facing walls - 
This is a century brick building and the hydrangea has not damaged the bricks but does tend to climb into the window frames - and across the windows 
luis_pr said: The lifespan of shingles on a sidewall can vary depending on several factors such as the type of shingles used, climate conditions, installation quality, and maintenance. Generally, asphalt shingles, which are commonly used for roofing, can last from 15 to 30+ years if well cared. A metal trellis or wire mesh against the wall could provide a suitable climbing surface for the plant. This will protect the integrity of the shingles and provide a secure structure for the hydrangea to grow on. But the climbing hydrangea will tend to live much longer. Not sure how easy it will be to eventually replace the shingles when the time comes and the climbing hydrangea is still there. Enjoy.
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