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GRP vs EPDM (Fibreglass vs Rubber)

Discussion in 'Roofing and Guttering' started by JohnA666, 21 May 2007.

  1. Xenon

    Xenon

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    Not sure what felts you have come across, but obviously not any decent ones.

    Its not used on a commercial scale because it has failed on a commercial scale for the reasons explained.
     
  2. manich45

    manich45

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    True I have little experience of felts,other than the countless roofs I have had to replace.Felt/bitumen just seems a bit primative in comparison to grp an edpm.
    The grp,cureit for example offer a guarantee in excess of 20 years but say it will last forever if installed correctly,the edpm about 20 years.Are there felts that can match this? Which ones you refering to,and how do they compare money wise.Also have you used cold adhesive,is it any good?
    Cheers
     
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  4. Xenon

    Xenon

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    Have a look at Bauder website to name 1. It was invented after the war to line reservoirs in Germany, and was utilised for flat roofing as a result. There are roofs 50 years old in it and totally fault free. We charge from £95-£180 ish a m2 depending on build up. Inclusive of prelims.

    Cold adhesive had a run in the 80's and to be honest, i've not seen it let go on the field area, but have on the laps. Its also a complete bastard when stripping, think bitumen in 100 degree heat. Most bitumous systems are self adhesive with welded lap and torch welded cap sheet, unless green roof then fully torched.

    We stripped Brent Cross in the 90's, 50,000 m2 of Butyl roof that had failed after 7 years, on every lap. The reason being the combined thickness of the lap had a different thermal movement to the flat, and rippled itself apart. Thats why single sheets cut to project are fine, but once you get over a managble size, joints are introduced, and it fails.
     
  5. manich45

    manich45

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    I agree about the joints,the whole idea is to use a single sheet cut for the job with edpm,that's why its ideal for small extensions,dormers etc.what do you mean by self adhesive,no bitumen or aditional adhesive needed,acept for seems?
    Cheers
     
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