A roof window will allow fresh air and daylight into a room. In some cases can be used as a fire escape.
There are different types of guttering (pvc, cast aluminium, cast iron) which comes in different shapes (deep flow, half round, squareline, ogee, miniline) which comes in different colours (brown, white, black, grey, cast iron imitation).
Kingspan insulation will keep your home extra warm saving money on bills. About 40% of all heat loss is through the roof. The insulation fit between the roof rafters and comes in several different thicknesses.
Ventilation is sometimes needed in some roofs to release condensation . There are ventilation tiles and ridges to match the type of the roof materials.