Frequently asked questions
to the OIB guidelines 2015
The answers to the FAQs represent the interpretation of the relevant OIB guideline by the respective expert advisory board for structural engineering guidelines at the time of preparation. The decision on the interpretation of the building regulations in a specific building procedure lies with the responsible building authority.
Although the 2015 edition of the guidelines for OIB Guideline 6 specifies how the distribution, distribution, storage and supply losses in multiple systems are to be divided, there are no further regulations on how to calculate the overall energy efficiency factor fGEE for such mixed systems and how to deal with requirements when comparing them.
These regulations are missing for good reason, as the situation is complex. For the calculation of the energy performance factor fGEE, for example, it is in no way permissible to add up the final energy for both the real equipment (EEB) and the reference equipment (EEB26) in a weighted manner and to set them in relation to each other. This is because this approach combines different energy systems in terms of final energy, which are in no way comparable in terms of energy use. This is precisely why the energy performance factor was introduced, because the different energy systems are not comparable at the final energy level.
Note: However, the calculation of the final energy demand for the specification in the energy performance certificate and the specification of the maximum permissible final energy demand as the required value by adding up the respective proportions is correct.
In the above example, the final energy of the direct electric heating or the air heat pump as the corresponding reference equipment cannot be combined or weighted with the final energy of a wood-burning stove or the corresponding reference equipment of a pellet boiler for the calculation of the overall energy efficiency factor fGEE due to the absolutely different energy inputs.
The following procedure should therefore be followed with regard to fGEE:
If more than 80 % of the gross floor area is supplied by one heating system, the different supply systems can be combined according to the zoning criteria and proof of the fGEE for this heating system must be provided.
In other cases, the fGEE of the individual zones must be calculated with the respective supply systems and compared with the requirement value of the respective zone.
Alternatively, the calculation can be carried out for the entire building (of a building category) with the different supply systems, assuming that they each supply the entire building. These fGEE values must then be weighted over the gross floor area and combined to form an fGEE and compared with the requirement. Rooms with two supply systems at the same time (e.g. living room with central heat supply with underfloor heating AND individual wood-burning stove) are to be divided into equal parts of the floor area for the weighting of the fGEE.
Note on individual stoves: In cases where the majority of the building is to be heated by a single stove, it must be checked whether heat distribution to all parts of the building is guaranteed.
Yes, of course the second introductory sentence should announce the requirements for non-residential buildings by analogy with the first introductory sentence. The reference to the residential building usage profile when verifying the requirements is correct. This is due to the fact that some usage profiles have such a high air change rate in their usage profile that the ventilation losses alone would rule out a positive undercutting of the requirement values. At the same time, this type of requirement setting offers the advantage that requirements are always met in the event of subsequent changes of use. This corresponds to the earlier concept of the HWB* (residential building equivalent, area-related heating requirement).
Yes, the required minimum proportion of energy from renewable sources can also be demonstrated by “increasing efficiency” alone (e.g. by exceeding the requirements for the building envelope or by a corresponding improvement in the heating technology energy requirement). The phrase “any combination” therefore also includes the application of only one of the measures listed.
Net final energy at the location or in the vicinity or final energy demand for hot water in point 4.3 of OIB Guideline 6 means the amount of energy that results from a monovalent hot water heat demand calculation without generating yields.
This means that any auxiliary energy shares for the solar thermal system must also be generated with regard to the final energy, i.e. the system must be dimensioned larger by this share than in a calculation at the useful energy level or hot water heat demand level.
Up to an inclination of 60°, the requirements for inclined transparent components, windows, French windows, glazed doors and skylights apply; above an inclination of 60°, the requirements for windows, French windows and glazed doors apply.
No, these are editorial errors. The conversion factor fPE.ern. is 0.00 and the fPE.n.ern. for natural gas is 1.17 – as in the 2011 edition.
In principle, all the reference equipment defined in points 9.2.1 to 9.2.10 of OIB Guideline 6 follow the idea that combined systems exist.
If there is a separate heat supply in which the heat for space heating is provided by a direct electricity heating system and the heat for hot water is provided by a heat pump, an air/water heat pump in accordance with point 9.2.12 is to be used as the reference equipment for the direct electricity heating system and a heat pump with the same heat source as the real equipment for the hot water heat pump.
To determine the requirements for the final energy demand and the overall energy efficiency factor, only the supply energy demand for the reference equipment “air/water heat pump according to point 9.2.12” is to be taken into account.
In all other cases, especially in those cases in which heat is provided separately for space heating and hot water or with different heat suppliers, only values for the final energy demand are to be used to determine the requirements for the final energy demand and the overall energy efficiency factor.
If, as in point 9.2.11, the heat for hot water is provided by direct electric heating, direct electric heating must also be used as the reference equipment, irrespective of how the heat is provided for space heating.
An air/water heat pump is to be used as reference equipment. A separate reference equipment will be developed in the future.
Yes, this is possible for compliance with the requirements of OIB Guideline 6, as it is not a matter of the normative proof of the avoidance of summer overheating, but of the proof of sufficient storage masses.
Address of the energy performance certificate issuer.
In the case of non-closable ventilation openings, a protection target-oriented design is required. Based on the R’res,w, this results in a sound insulation level that must be achieved even if ventilation units are present.
Relief is only available for closable ventilation openings in the open position, as the sound insulation level can be achieved by closing the openings. If the openings cannot be closed, the requirements for the required R’res,w apply.
In accordance with RVS 03.07.32, the ramp gradient refers to the center of the roadway.
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This FAQ has been deleted, as point 0 (preliminary remarks) of OIB Guideline 4 has created the possibility for an equivalent deviation:
“The requirements of this OIB Guideline may be deviated from in accordance with the respective provincial regulations if the building applicant can prove that the same level of protection is achieved as with the application of the Guideline.”
The examination of the equivalent deviation is carried out by the competent building authority.
No, R-values or other characteristic values can also be used.
No, R-values or other characteristic values can also be used.
No, according to point 3.2.5, handrails on stairs only have to be installed in the area of the steps and therefore only at the flight of stairs, but not in the area of the landings. Only in buildings or parts of buildings that are to be designed barrier-free are the handrails to be extended 30 cm beyond the edge of the steps.
No, as these are furnishings, it is possible to deviate from point 2.7.1 of OIB Guideline 4, March 2015 edition. The width must not be less than 60 cm. This corresponds to § 33 (6) of the Workplace Ordinance (AStV).
Due to various disabilities, people in wheelchairs or with rollators have limited or no mobility in their upper body and cannot bend forwards, for example, or only have one hand trained for gripping. For this reason, they must position the wheelchair or rollator parallel to the side of the door leaf in order to operate the door, which is why the approach area must be guaranteed on both sides of the door.
Yes, as the apartment entrance door is assigned to the apartment, the barrier-free adaptability within the meaning of point 2.9.2 in conjunction with point 7.4.2 of OIB Guideline 4, March 2015 edition, also applies to the apartment entrance door. However, as the adaptability must be achieved without considerable effort, the corresponding preparations (such as empty pipework) must be carried out in advance for subsequent installation measures of free swing door closers, power-assisted drives, fully automatic drives with fire control, etc.
A door without a door closer is easy to operate in standard operation if it does not exceed the operating forces and torques of class 3 in accordance with ÖNORM EN 12217 (e.g. 25 N for opening the door leaf on swing doors and sliding doors).
A door with a door closer (e.g. fire and smoke protection doors) is easy to operate in standard operation if it does not exceed the opening torque of door closer size 3 in accordance with ÖNORM EN 1154.A door with a door closer (e.g. fire and smoke protection doors) is easy to operate in normal operation if it does not exceed the opening torque of door closer size 3 in accordance with ÖNORM EN 1154.
Higher operating forces and opening torques are permitted in the event of a fire.
No, short-term ventilation processes (shock ventilation) are not affected.
Yes, OIB Guideline 3 stipulates as a requirement for access to cleaning openings that access to cleaning openings must not be via other residential or commercial units. If the residential or commercial unit in which the cleaning opening of the flue gas collector is located is connected to the flue gas system, then this residential or commercial unit is not an “other” dwelling.
No.
No, for buildings with mixed use, the provisions of the OIB Guidelines for the respective use must be applied for the individual areas of use (see Explanatory Notes on OIB Guideline 2, under point 0 “Preliminary remarks”).
As rooms used for catering purposes are not explicitly mentioned, they must be assigned to a type of use.
In the case of point 3.2.1, second sentence, rooms used for catering purposes can be included in this up to the maximum fire compartment area, as they are comparable to retail premises in terms of fire protection.
Yes, individual cables, with the exception of empty conduits, with a maximum diameter of 25 mm may be routed through components with fire protection requirements at a distance of at least 1 m from each other, even without tested or classified penetration sealing measures, if the opening is designed to fit the cable diameter precisely.
No, if the buildings on the neighboring property are “subordinate single-story structures”, buildings of GK 1 or terraced houses of GK 2, a distance of 2.00 m between these buildings is also sufficient.
Yes, the area of the salvage room is included in the net floor area of the fire compartment.
No requirement for BROOF (t1) is necessary for skylight domes, continuous rooflights and the like, which in total do not exceed 15 % of the associated roof area.
No, the requirements in lines 4.1 and 4.4 of Table 1b of OIB Guideline 2 only refer to the load-bearing capacity (R) and therefore only to the load-bearing components (primary load-bearing structure).
“Internal alerting” means that sirens are only to be installed in the monitored areas (stairwells including generally accessible areas such as corridors and cellars), but not in apartments and other usage units.
