walls are generally old (edit: not that old - late 1950s) clay blocks a bit like this (plastered over), a couple have plasterboard in addition too.
Pictures are generally A3 to A2 size, mostly in Ikea frames (i.e. not very heavy)
Might be worth looking into command strips, we have used them on a load of pictures recently and wouldn't go back to hooks, they fully stick them to the wall, so don't have to worry about the pictures going wonky all the time.
oh these look great, especially if they peel off nice and easy should things need to be moved - thank you!
@Sam_w started
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walls are generally old (edit: not that old - late 1950s) clay blocks a bit like this (plastered over), a couple have plasterboard in addition too.
Pictures are generally A3 to A2 size, mostly in Ikea frames (i.e. not very heavy)