With reference to the above we confirm that we carried out a roofing assembly test at D & D Glazing’s premises on the 30th January 2007.
Prior to the commencement of the testing we were provided with documentation prepared by the Advisory Committee for Roofwork - ACR [M] 001:2005.
Mr David McDowall of the above address supervised the entire test as the competent person and he has provided a dated signature below.
The principle of the test was to determine fragility of a roofing assembly by releasing a specified weight in a controlled fall under gravity towards the assembly. The results of the test classify the assembly in accordance with the degree of resistance to withstand the impact from the weight.
The assembly tested was the PL8 System. The test piece spanned a distance of 1436mm, supported on a steelwork testing frame. The testing frame was pitched to an angle of 7.5 degrees to represent a roof slope.
The assembly tested is a two edge support system consisting of three glazing bars (PR8 sections) spaced at 655mm centres.
Two pieces of glass infill span between the three PR8 glazing mullions.
The assembly was subject to multiple drop-tests using the following apparatus. A cylindrical sand bag (45kg in mass) was released (using a quick release mechanism) from a height of 1200mm. The height was measured from the underside of the bag to the highest surface of the assembly under test.
Three drop tests were carried out in accordance with the test method described in ACR [M] 001:2005.
Following the third drop test the glazed infill and supporting assembly showed no evidence of significant damage that would affect the long term strength and weather ability of the assembly. The PR8 System and glazed infill may therefore be classified as a Class A Non-fragile Assembly in accordance with ACR [M] 001:2005.
Testing continued after the completion of the ACR [M] 001:2005 procedure. A further two drop tests were carried out from an increased height of approximately 1500mm.
The fifth test impacted directly on to the central PR8 bar. The impact resulted in a permanent deflection over the length of the bar of approximately 5-6mm. No damage was evident to the glazed infill following completion of the fifth test.
This concludes our report.
David McDowall
Mr David McDowall – Proprietor D & D GLAZING (Glasgow) Ltd
