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Old 08-14-2011, 12:29 PM   #1
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Flat Rubber Roof.


Hello again and thanks for your advice so far:

This EPDM rubber roof I'm doing. A part of it has to lap over bitumastic coated ply. I can't see impact adhesive or water based adhesive working on bitumastic, so what else?

Bitumastic felt lap adhesive perhaps? (which seems very similar to roof and gutter sealant). But isn't bitumastic a bi-product of oil hence will it not eventually dissolve the epdm rubber?

Be glad if you can advise on this. Thanks, Peter.

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Old 08-15-2011, 10:23 AM   #2
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Flat Rubber Roof.


Look into fleeceback EPDM or a coverboard will need to be installed. I have no idea what bitumastic is, sorry.

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Old 08-17-2011, 03:11 PM   #3
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Originally Posted by Grumpy View Post
Look into fleeceback EPDM or a coverboard will need to be installed. I have no idea what bitumastic is, sorry.

Tell you what, Grumpy, a single reply to this thread may not be many but it's one more than I got from a similar forum here in the UK.

I think the word Bitumastic is a combination of Bitumen and Mastic. Bitumen being the black tarry stuff we bung on roads and roofs. In this case it's been used as a paint to protect part of the existing plywood decking to which I'm glueing epdm rubber.

Fleeceback epdm? What on earth is that? A fleecy liner to make it adhere better perhaps?
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Old 08-17-2011, 03:46 PM   #4
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Yes it's a factory applied fleecy liner. The purpose is not adhesion. Well it does that too. But the purpose is as a seperation between the bitumen.
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