Depending on width you will need between 275mm and 350mm clear space above
door and in roof space to accomadte the rolled up door.
Thermaglide are extremly easy to install and come with good instuctions for
a diy install,they are also insulated.they do not depend on a spring for
The other type from steel-line or henderson are not in my opinion your
average diy install type as the spring tension needs to be set by the
installer and can be tricky if instructions are not followed,and also they
look cheap and are cheap