Frequently asked questions
to the OIB guidelines 2011
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.
- OIB Guideline 2 / 2011
- OIB Guideline 2.2 / 2011
- OIB Guideline 3 / 2011
- OIB Guideline 4 / 2011
- OIB Guideline 5 / 2011
- OIB Guideline 6 – Guideline / 2011
- OIB Guideline 6 / 2011
- OIB Guidelines, Standards and Regulations / 2011
This is an editorial error, the actual date is 01.01.2010.
Test values from PHI tests that have been reduced by 5% points and test values from DIBt-TZWL tests that have been reduced by 14% points. Test values that were determined before December 15, 2010 (new publication of ÖNORM EN 13141-7) can be used without reductions.
The passage “Grid feed-ins may not be used to reduce the final energy demand” means that yields may only be balanced to reduce demand if a demand occurs at the same time! Until standardized load profiles are available, the existing loads may be distributed evenly over the times of use.
Yes, compare HWB26 6 lines below, (division by 3)
Buildings with passive cooling are not buildings without existing cooling (fKT = 0). In the absence of a separate value for fKT, the stricter of the two fKT values for compression chillers must therefore be used.
In the calculation, the energy consumption figure 1.005 is to be used with rounding to 3 decimal places (e.g. formula 45 or 75 ÖNORM H 5056:2011).
The correct value is 0.9 W/m²K.
The quote is to be understood as meaning that at least these two (a, b) are only to be given in the absence of sufficient recommendations for the five measures listed in the list.
At least the HWB and one other energy performance indicator must be improved, whereby it is assumed that no energy performance indicator will deteriorate.
The household electricity demand QHHSB must be determined using the gross floor area. Using the example of a residential building, this means that for qi,h 3.75W/m² 50% must be taken into account and this must be multiplied by 8760 h (annual duration), divided by 1000 (conversion to kWh) and multiplied by the gross floor area. The specific household electricity demand HHSB is determined by dividing by the gross floor area. The intermediate step (multiplication + division) must be carried out in order to take account of possible yields. (HHSB = 1.875 W/m² x 8760h / 1000 * gross floor area / gross floor area = 16.43 kWh/m²a) Proceed in the same way for the operating electricity demand BOD. This means that the mean value of qi,h and qi,c is used instead of qi,h. (Please note: qi,h and qi,c are not based on usage time, so 8760 h must also be used).
If terraced houses are erected as a joint structure, this requirement applies to the entirety of the two walls in the case of two adjoining walls.
In this case, the U-value must be determined from the area formed by the symmetry planes. Note: For constructions that are not curtain walls – e.g. storey-high mullion-transom constructions – the test standard dimension of 1.23 m x 1.48 m must be used.
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, the dimensions 1.48 m x 2.18 m must be used for French doors and glazed doors, 1.23 m x 2.18 m for doors and 2.00 m x 2.18 m for gates. This results from ÖNORM EN 12567-1.
Determination is carried out in accordance with ÖNORM EN ISO 6946 Annex C – Wedge-shaped layers.
For the same building envelope, the characteristic values for PEB and CO2 for the energy system must not be worse than those with the systems according to a), c) and d) when calculated according to the standard. Natural gas condensing boilers in combination with solar thermal systems are also considered highly efficient alternative energy systems in residential buildings if there is no district heating connection or if the use of biogenic fuels is not possible or not economically reasonable for reasons of air pollution control or due to a lack of supply or storage options. The proportion of solar yields should be optimized. If the installation of solar thermal systems is not possible or not economically feasible due to the location, this combination can be dispensed with
Listed buildings are identified as such in the land register. In the case of listed buildings, all structural measures, including measures to increase energy efficiency, must be agreed with the Federal Monuments Office. Prior to implementation, approval must be obtained from the Federal Monuments Office in accordance with Section 5 of the Monuments Protection Act. Information can be found in the “Energy efficiency in listed buildings” guidelines issued by the Federal Monuments Office in March 2011.
In new buildings, the flow temperature adapts to the outside temperature (heating curve); a sliding operating mode is state of the art and should therefore be used.
The requirements only apply in the sense of ÖNORM B 8115-2 for recreation rooms.
The same requirements apply as for classrooms.
The “other unit of use” is also the neighboring group room, as in the case of classrooms.
The same acoustic requirements apply as for terraced houses.
As OIB Guideline 5 only specifies requirements for measures on the room boundary surfaces, offices in normal use are not affected by the requirement. Satisfactory room acoustics can be achieved here through the furnishings.
The OIB guideline regulates requirements for parking spaces in buildings, whereby the spatial requirements relate only to the building and not to mechanical installations. The dimensions required for mechanical parking facilities are determined by the manufacturer’s technical requirements.
The provision specifies requirements for vertical glazing made of toughened safety glass with a shatter height of more than 4 m. The heat-soak process alone does not replace the additionally required protective devices. Reference is made to any deviating national regulations.
Stoves and ovens (e.g. tiled stoves and fireplaces), where hot surfaces are necessary for the intended use, are not affected by the provision of point 6. In addition, reference is made to the content of the Explanatory Notes to OIB Guideline 4, from which it is clear that the primary focus was on building services installations.
The requirements of point 8.3.5 of OIB Guideline 3 can be deviated from in any case if the equivalence of the ventilation is proven by an aerodynamic expert opinion. For garages with more than 250 m2 of usable floor space, no more than one underground storey and with little incoming and outgoing traffic (e.g. in residential buildings), equivalence is also given if the ventilation openings are not routed via shafts and the top edge of the floor is more than 3 m below the adjacent ground level after completion.
The requirements of point 8.3.6 of OIB Guideline 3 can be deviated from for garages with more than 250 m2 of floor space, no more than one underground storey, little incoming and outgoing traffic (e.g. in residential buildings) and natural ventilation, as a low CO concentration is to be expected in this case. In this case, smaller distances are permissible. However, the provisions of point 3.1.5 of OIB Guideline 2 must be complied with.
No additional requirements apply, but the required light entry area must be calculated once for the inner window and floor area, taking into account the allowance for the projecting component (loggia ceiling), and once for the outer loggia glazing with the floor area of the room including the loggia. Both requirements must be met.
No. Screed edge strips do not have to comply with class E, as their contribution to fire is negligible. In point 2.1.1, “non-substantial parts” refers to construction products and not merely components of non-homogeneous construction products to which the criteria of ÖNORM EN 13501-1 would apply.
No. The requirements for partition walls do not apply to walls between balconies and terraces
Yes.
Yes, although this design represents an insignificant deviation from the requirements according to point 5.2.2 of OIB Guideline 2.2, it can be regarded as equivalent to mastic asphalt and asphalt concrete in Bfl.
