BS EN 15080-12:2011 pdf download – Extended application of results from fire resistance tests Part 1 2: Loadbearing masonry walls

BS EN 15080-12:2011 pdf download – Extended application of results from fire resistance tests Part 1 2: Loadbearing masonry walls
5.2 Masonry mortars and joints
(1) For all types of masonry mortar – general purpose mortar, lightweight mortar, thin layer mortar – the test results are valid for mortar compressive strengths equal or higher than tested.
(2) Test results for walls with lightweight mortar with a gross density up to 800 kg/m³ tested are also valid for walls with lightweight mortars with a density higher than tested and for general purpose mortar with a bond strength classification equal or greater than M5 according to EN 998-1:2010.
(3) Test results for walls with lightweight mortar with a gross density > 800 kg/m 3 are also valid for general purpose mortar with a bond strength classification equal or greater than M5 according to EN 998-1:2010.
(4) Test results for walls with thin layer mortar are valid for all types of thin layer mortar and general purpose mortar with a bond strength classification equal or greater than M5 according to EN 998-1:2010.
(5) Test results for walls with lightweight mortar and general purpose mortar are valid for walls with thin layer mortar, if the utilisation factor does not exceed the relation between the load in the test and the design resistance for walls with thin layer mortar.
(6) Test results for unplastered or unrendered walls with unfilled perpend joints are valid for walls with a maximum perpend joint thickness equal or smaller than tested.
(7) Test results for unplastered or unrendered walls with filled perpend joints are valid independent of the perpend joint thickness.
(8) Test results for unplastered walls with unfilled plain perpend joints are valid for all types of perpend joints executed according to EN 1996-2.
(9) Test results for unplastered walls with vertical tongue and groove joints are only valid for walls with tongue and groove joints or with filled perpend joints.
(10) Test results for plastered or rendered walls are valid for all types of perpend joints executed according to EN 1996-2 independent on the perpend joint thickness.
(11) For the classification REI-M an extrapolation is possible within one type of mortar and from:
general purpose mortar to thin layer mortar;  lightweight mortar to thin layer mortar;
lightweight mortar to general purpose mortar with a strength equal or greater M5 according to EN 998-1:2010;
thin layer mortar to general purpose mortar with a strength equal or greater M10; if the applied load on the wall does not exceed the load in the test.
5.3 Plaster, rendering or external covering
(1) If plaster or rendering based on sand cement is tested, the test result is valid for all types and the same or higher thickness of plaster or rendering.
(2) If plasters or renders based on gypsum binder or renders LW and T according to EN 998-1 are used, the result is valid for the tested type of plaster or rendering with the same or higher thickness.
(3) If a wall is tested without plaster or rendering the test result is also valid for plastered or rendered walls.
(4) Rendering for external walls can be replaced by a second leaf of masonry or a thermal insulation with non combustible insulation material of at least the same thickness than the rendering.
(5) Test results for walls covered with gypsum plaster are also valid for walls covered with LW or T renders.
(6) Test results for walls covered with LW or T renders are also valid for walls covered with gypsum plaster.
5.4 Load Level
(1) For the ranges of compressive strengths given in the rows of Table 1, an extrapolation is possible for utilisation factors up to the utilisation factor applied in the test.
(2) Test results for units from row number 1 in Table 1 are also valid for units in rows 2 and 3 if the applied load on the wall does not exceed the load in the test.
(3) Test results for units from row number 2 in Table 1 are also valid for units in row 3 if the applied load on the wall does not exceed the load in the test.
(4) An extrapolation from tests with eccentric loading (e ≤ t/6 from the centre) is possible to walls loaded with the same or a lower eccentricity.
(5) An extrapolation from tests with centric loads is possible for walls with eccentric loading (e ≤ t/6 from the centre). (6) An extrapolation for higher utilisation factors for a reduced fire resistance period is possible if a sufficient number of test results give evidence about the load-deflection behaviour of the tested specimen.