Part I Johns Manville
From the end of July this year, the Chinese National Waterproofing Association (CNWA) has paid a 12-day visit to Johns Manville (Bobingen) and Vedag (Bamberg and Freising) in Germany.
The visit was invited by both JM and Vedag. The association has visited JM's research center for polyester nonwovens in Bobingen. According to JM, the market share of staple polyester shrinks at 10% each year. The turnover of spunbond polyester carrier for roofing is 600 million square meter, the staple polyester is 200 million, glass mat 500 million and glass cloth(玻璃布？) 120 million. The research center argued that spunbond polyester carrier has a better performance than the staple. Under the same density, the former one has some advantages eg. better strength, better elongation, stability and evenness. Even though staple can increase the density for 20% to compete with the spunbond in terms of strength, the staple one cannot reach an evenness like that of the spunbond. And the thinner spunbond can
make it easier to be impegnated and carry a thicker coating asphalt, which increase the durability of the roofing membrane.
Of course, one should take a grain of salt for these statements. Nevertheless, JM is marketing the spunbond product, especially those produced in Shanghai to the association and Chinese customers.
In Europe, JM said, the glass felt is mainly used for oxidized roofing and protective layer. 99% of SBS and APP membrane have polyester felt inside. Double layer waterproofing system is widely accepted in Europe, with a oxidized membrane as the basic layer and polyester roofing as a surface layer.
Laminated products made from fiberglass and polyester are more and more popular for high-end products. JM produces 180g laminated from glass grid and nonwovens, and 280g laminated from glass mat and polyester felt. The market for these laminated products for high-end roofing is 5 million square meter in Europe. However, this once widely used laminated felt is being dropped because of the shinkage problem.
JM also cited that an aluminium laminated product in the market.
Since the price of asphalt keep hiking, PVC, TPO, and EPDM membranes are eating up the market because of the relatively low unit price.
Besides, Manville also specified a aluminium laminated nonwovens in the market.
Part II Vedag
Vedag is an important roofing producer. Probably initiating the green roof, the company invited the CNWA to its headquarters in Bamberg. With production bases in Germany, Poland and Slovakia, Vedag has a annual turnover for roofing of 55 million square meters, selling worldwide. Among them, 24% are oxidized membrane, 34% SBS, 40% self-adhesive and APP, and 2% glass shingles.
Vedag thoroughly introduced the testing method of prEN13948, the root penetration test, to the Chinese delegation. Also, accompanied by Vedag, the delegation visited several projects of green roof.
Part III - BDA
The last stop of the delegation is BDA in Netherlands, which introduces the roofing market in Europe. According to them, 60% membrane in Germany is SBS, 90% membrane in Italy is APP, 80% membrane in France is SBS and in Netherlands, 70% are SBS and APP, the rest are single ply.
The underslating with breathability is required for asphalt roofing and slope roof.
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