1. insulating between the roof timbers?; you might inadvertantly make the roof's ventilation system worse and thereby encourage rot and impare the strength of the timber; so that could well need an application.
2.strengthening and boarding the floor;? boarding the floor technically adds weight, so how do you know you've strengthened it sufficiently? May need an application to check!
3. adding velux?; a structural alteration to the rafters (unless you get a very narrow one). Also, you might be altering the thermal characteristics of the property - an application here!
Just playing devil's advocate, but you get the gist. As you will have learned by now, there is a fine dividing line in these matters.
Just ensure you are sensible in what you store up there, and definitely not the kids.
2.strengthening and boarding the floor;? boarding the floor technically adds weight, so how do you know you've strengthened it sufficiently? May need an application to check!
3. adding velux?; a structural alteration to the rafters (unless you get a very narrow one). Also, you might be altering the thermal characteristics of the property - an application here!
Just playing devil's advocate, but you get the gist. As you will have learned by now, there is a fine dividing line in these matters.
Just ensure you are sensible in what you store up there, and definitely not the kids.