The short answer
They drop leaf litter, pine needles and small branches that clog gutters and valleys, they shade slopes so moss thrives, and in a gale a branch can break tiles. None of it is hard to manage, but blocked drainage and moss are the usual start of a leak in a parkland village.
Highclere's setting is wooded parkland, designed in the 1770s, so a roof here is rarely far from a tree. Trees are lovely and not kind to roofs, and a parkland village has plenty of them. The damage tends to be gradual and easy to miss from the ground.
Q3.1How do I stop gutters filling with leaves?
You cannot stop it, but you can manage it. Gutter guards help with leaf fall, though they need a look now and then too. Clearing gutters and valleys after the autumn drop and again once the catkins and seeds have gone keeps water flowing. When a gutter overflows down a stone or brick wall, the damage is to the masonry, not the roof, and it is costly.
Q3.2Does moss on a shaded roof need removing?
A light film does little harm. Thick moss holds water against the tiles and lifts them, and it blocks the channels between courses. Scraping by hand is gentle; pressure washing can damage delicate tiles, according to MyBuilder's cleaning guide, so we avoid it on old clay and slate.
Q3.3What if a branch has come down on the roof?
We make the roof safe first, clear the debris and cover any opening. Then we look at the tiles, battens and rafters beneath, because a broken tile often hides a split batten. The written quote that follows covers what is needed, no more.
Our roof repairs page covers the line between a patch and a bigger job, and the same approach applies to storm and branch damage. Cutting back the branch that did it is a conversation with whoever owns the tree, and worth having before the next gale.