Changing a house roof to accommodate a dormer window, Velux roof windows or to realign the roof to give a more harmonious look to the building are very common tasks when renovating a property here in central portugal.
Broadly speaking you have two types of roof construction which are widely used here. One is reinforced concrete “T” beams (vegas) and brick in fill to produce a roof which is fire proof, insect proof and very strong. Although not always waterproof !
The second method is a timber roof. Not the eucalyptus logs that we often see when opening up a problem roof.