The traditional roofs are made of wood and interlaced palm leaves or grasses, which create a thick beautiful protection for the rain. Platano is the strongest wood and originally used for sacred buildings. A lot of second hand wood is used especially in area that are natural reserves.
The palm leaves layer needs to be treated regularly against insects and completely replaced every 5 or 6 years. Roofing a 12'x20' cabana could cost about $3500. The overhang is typically pretty deep insuring enough shade to keep the building cooler.
Most locals prefer corrugated zinc roofs, which are cheaper and require less maintenance. I also heard that president Ortega has been giving zinc roofs to people to win their votes.
Clay tile roofs are also common and typically set an a wooden structure.
Vernacular and natural buildings have often walls made out of mud and straws. The result is a very solid and strong wall that has great insulation properties. It's built compacting layers of this material so that there are no crevices left. No forms are used but just horizontal and vertical strings to guide the alignment. There could be vertical cavities running inside the thickness of the wall to improve insulation, or horizontal openings made typically with bricks to improve cross ventilation. The finish is applied with layers of a progressively more refine mix of mud, straw and horse escrements. Yes, that's right.
Wood is also used for vertical enclosures in traditional architecture.
Often the most solid material is used only up to the bottom of the windows, leaving the upper part to lighter structures made with bamboo or similar. Cross Ventilation is extremely important and oftenthe walls have permanent openings covered with mosquito nets.
In Nicaragua the soil is very rocky because it's a vulcanic land and especially small buildings have rock foundations.
Stilts houses are also very common to insure protection against flooding and also to keep out vermin. The shady space under the house can be used for work or storage.