Planteamiento del problema de investigación

E.1 For houses, public works and auxiliary works of industrial projects

Fire protection distance between houses, public works and auxiliary works of industrial projects follows Table E.1

Fire protection distance from houses, public works and auxiliary works with fire-resistance grade of I and II to manufacturing houses and garages with fire-fire-resistance grade of I and II must be higher than 9m; to manufacturing houses having proof with insulation of polymer material of inflammable material must be higher than 15m.

Table E.1 - Fire protection distance between houses, public works and auxiliary works of industrial projects

Distance (m) to second house with fire-resistance grade Fire-resistance grade of the first

house

I, II III IV, V

I,II 6 8 10

III 8 8 10

IV,V 10 10 15

Legend: 1) Distance between houses and works is clear distance between walls or theirs external structures. In case structures of houses or works made of inflammable materials protruding more than 1 meter, the distance between these structures is applied.

2) Distance between walls without hole of windows is allowed less than 20% except houses with fire resistance grade of IV, V.

3) For the two-story houses with frame structure and panels with fire resistance grade of V, as well as houses with roof of inflammable material, fire protection distance must be higher than 20%.

4) Distance between houses with fire resistance grade I and II is allowed less than 6m, if higher walls of the house opposite to the other house are fire walls.

5) It is not specified distance between houses, as well as between house and works for other activities if total area of construction land (including non-construction area inside) do not exceed the highest allowed floor area in the limit of a combustion chamber (see Appendix H, house of group F.1, F.2)

E.2 For houses and industrial works

Fire protection distance between houses and industrial works belongs to fire resistance grade and its manufacture grade is not less than value in Table E.2.

Table E.2 - Fire protection & fire fighting distance between houses and industrial projects Fire-resistance grade of

the first house

Distance (m) to second house with fire-resistance grade

I, II III IV, V

I, II For houses and works with manufacture grade of D, E: not specified

For houses and works with manufacture grade of A, B and C: 9m (see Legend 3)

9 12

III 9 12 15

IV, V 12 15 18

Legend: 1) Smallest distance between houses and works is clear distance between walls or theirs external structures. In case structures of houses or works made of inflammable materials protruding more than 1 meter, the applied smallest distance is distance between these structures.

2) It is not specified distance between manufacturing houses and industrial works in the following cases:

a) If total floor area of the 2 houses or more fire having fire-resistance grade III, IV does not exceed the largest permitted floor area in one combustion chamber (Appendix H);

b) If wall of the house or building higher or wider turns toward another building which is fire wall;

c) If houses and works with fire resistance grade III that does not depend on fire danger level in manufacture grade have opposite walls being solid walls or perforated walls that are built with glass block brick (or glass wired) with fire limit not less than 1 hour.

3) Specified distance for the houses and works with fire resistance grade I, II, manufacture grade A, B, C is reduced from 9m to 6m when meeting one of the following conditions:

a) Houses and works are equipped with automatic fire fighting system.

b) Own loading capacity by combustible substance in the house with manufacture grade C is less than or equal to 10 kg per 1m2 floor area.

E.3 Some cases allow fire distance less than specified ones.

Fire protection distance from a house to houses and surrounding works around, can be less than specified distances in Item E.1 (Table E1) and in Item E.2 (Table E2) when obtaining approval of Fire Authority and carrying out as following specifications:

a) Fire protection distance of determined house in this case is distance from the house to land boundaries of the house (not the distance to another house on adjacent land);

NOTE: land boundaries of the house may be the coincident or parallel line with one sideof the house or combination with one side of the house one angle of less than 80 ^o.

b) External wall of the house is allowed to have a distance to land boundaries of the houses from 0m to less than 1,0m; with the following conditions:

+ External wall must be fire wall type 1 (REI 150) for house with fire resistance grade I and II; and fire wall type 2 (REI 60) for house with fire resistance grade III and IV;

+ Surface of external wall are not formed by materials that are more combustible than the one of groups Ch1 and LT1.

c) If the external wall of house having a distance more than 1m to land boundaries, it is allowed to arrange, to form some parts of surface of external wall having fire level less than specified for fire wall and it is called surface of wall being not protective againts fire. The maximum permit surface of the non fire-rated protected part of the external wall is specified accordingly to the distance between this wall to the land boundaries of the house, and is given in Table E3.

LEGEND: The non fire-rated protected part of the external wall is general as follow:

− Doors (doors, windows,…) which do not meet requirements are fire doors in fire wall;

− Parts of wall have fire resistance limit less than the fire resistance limit of correspondent fire wall;

− The external area of wall composed of materials that are equal or more combustible than the one of groups Ch2 and LT2.

Table E3 - Distance from external wall of house (or combustion chamber) to land boundaries is determined according non fire-rated protected surface of that wall Minimum distance between lateral side of

house to land boundary (m) Houses, public works, auxiliary houses of industrial works

Houses and industrial works, warehouses

% maximum surface of non fire-rated protected part compared with total surface area of wall opposite to land boundary

1,0 1,0 4,0

1,5 2,0 8,0

3,0 4,0 20,0

6,0 8,0 40,0

LEGEND: 1) when calculating the maximum surface of the non fire-rated protected area of the external wall, it is possible not to take into account of these zones:

a) Zones having surface less than 1m² and distance from this zone to any other non fire-rated protected zone must not less than 4m;

b) Non fire-rated zones having surface less than 0,1m² and distance from this zone to any other non fire-rated protected zone must not less than 1,5m;

c) The external area of a staircase having cage and internal walls of the cage in satisfaction of fire stop request corresponding to the fire resistance grade of the house;

d) The external area of wall composed of   materials that are equal or more combustible than the one of groups Ch2 and LT2 then the non fire-rated protected surface will be the half of that zone surface.

2) Intermediate value could be determined by interpolation.

Appendix F