BS 534:2006 pdf download – Corrugated bitumen sheets — Product specification and test methods 5 Requirements 5.1 Geometrical properties 5.1.1 Length When tested according to 7.1.1, the tolerance on length L shall be + 1,0 %, – 0,2 %. 5.1.2 Width When tested according to 7.1.2, the tolerance on width w shall be ± 2 %. 5.1.3 Thickness When tested according to 7.1.3, the tolerance on thickness e shall be ± 10 %. The thickness of the corrugated bitumen sheets shall be measured including any surface relief (surface pattern) on the upper and lower sides (see Figure 4). NOTE Due to the fact that the relief of the surfaces may be very different (e.g. from one manufacturer to the other), the measurement of the thickness will give only some descriptive information and therefore cannot be directly compared between different products. 5.1.4 Height of corrugations When tested according to 7.1.4, the tolerance on the height of corrugations H shall be ± 6 %. For corrugated bitumen sheets with various corrugation heights, all the declared corrugation heights shall be measured. 5.1.5 Pitch of corrugations When tested according to 7.1.5, the tolerance on the pitch of corrugations p shall be ± 3 %. For corrugated bitumen sheets with various pitches and/or period of corrugation, all the declared pitches and/or periods shall be measured. 5.1.6 Squareness When tested according to 7.1.6, the squareness E shall be less than or equal to 4 mm/m. 5.2 Mechanical properties 5.2.1 Bending under downward load When tested according to 7.2.1, the minimum load for a deflection of 1/200 of a span of 620 mm shall be: category R ≥ 1400 N/m 2 category S > 700 N/m 2 NOTE For calculation of maximum permissible load in manufacturers’ installation guides, other methods may be used particularly in case of sheet shapes that do not allow the distributed downward load described in 7.2.1 to be applied. 5.2.2 Impact strength When tested according to 7.2.2, the falling height with a span of 620 mm shall be: category R = 400 mm; category S = 250 mm. This requirement is not relevant for external wall finishing products. 5.2.3 Tearing strength When tested according to 7.2.3, the tear threshold value shall be greater than: category R = 200 N; category S = 150 N. Where, in the case of a corrugated bitumen sheet with various corrugation heights, the manufacturer defines which corrugation has...

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