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Posted by marson on February 20, 2008, 6:17 pm
> upand_at_t...@yahoo.com wrote:
> > I've looked in to this and it looks straightforward enough that me and
> > a friend could replace my rubber roof with new EPDM.
>
> > My question is that I know it has a slight pitch to direct rain water
> > towards the drain, but what was used to shape the roof? When I bought
> > the house the inspector said something about foamboard? I was
> > thinking of using wedges to nail to the top of the joists that the
> > underlayment will lay on...It would be easy enough to create the
> > slight pitch that way.
>
> > Mike
>
> GAF and many other companies make foam board insulation and wedge
> shaped foamboard to provide slope. We use it all the time on
> commercial buildings to form the slope. Either that, or the roof
> is framed using standard roof joist systems which are then built
> up with wedge cut members to slope the roof, which is then
> decked. The foam board can then be used for insulation and the
> roofing material goes over that.
>
> Here is an example of sloped foamboard:
>
> http://www.gaf.com/Content/Documents/1040.pdf
>
> --
> Robert Allison
> Rimshot, Inc.
> Georgetown, TX
Robert is right as usual. Note that usually you have to screw down
coverboard over the foam (otherwise the contact cement will melt the
foam). coverboard is just 1/2" fiberboard held down with washers.
You could do it with wedges as you suggest, but then you would have to
sheath it with 3/4" t and g plywood--at least that is what is specced
on the flat roofs I do. Might find information here:
http://www.watertighttech.com/home.shtm
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