'Team Old House' will come to everywhere in Japan!
It is structurally difficult to change to a modern-style floor plan, as the layout and integration of the layout and structure have been completed in old houses, especially farm house type houses.
■ Under the floor / pillar of an old house
Under the floor of an old private house and the base of a pillar may be rotten due to the moisture of the ground and the damage of termite.
↑ Rotten pillar at base
← Good condition of under the floor and root of the main pillar
→ the level of the floor is often not kept in many cases.
← Total replacement of floor & under floor
← Termite damage sometimes happens near the roof!
■ Earth wall
Earth walls may lose strength by adding moisture. If you try to push the surface of the wall with your finger and feel 'soft' then the wall will not be a proof element against earthquakes.
Even if it seems to be "wall" from the floor to the ceiling as seen from the room, soil is not painted below the floor or above the ceiling, so it is necessary to check the ceiling under the floor and under the floor.
← The mouse was living in the earth wall! What ?!
In the case of thatched roof (including those with metal etc.), the indoor environment in the summer changes greatly depending on whether Kaya is left or not. Of course, it is better for Kaya to remain.
In the case of tile roofing, the weight of the house will change depending on whether or not you use soil on the ground = the seismic performance of the house will change.
↑ Often the eaves are damaged if the mountain slope is approaching the back of the house.
■ Seismic retrofit / critical load calculation method
Most old houses have pillars on the stone (called "Ishibadate") and we use the special calculation method for the structural calculation of these buildings.
This calculation method is suitable for evaluating the earthquake resistance performance of old houses because it can take into account the strength of facters such as small walls, large columns and joints using long beams of beams.(It is not considered in the general wall magnification method)
In the seismic retrofitting work of an actual old private house, investigate / evaluate the degree of deterioration of the load-bearing element, calculate the amount of necessary load-bearing element using the critical load-bearing capacity calculation method based on it, increase the load bearing capacity as necessary, Lighten the weight.
↑（上３枚） Example of reconstructing the tile roof into metal sheet roofing ... If the original shaping is good the appearance is good.