new rubber roof

I have a flat roof, the contractor wants to use 1.5" polyiso foamboard over the bare wood deck, I know the benefit of added insulation. But since the foamboard compresses when walked on, wont this ruin the roofing early in its lfe cycle since as the rubber roof ages and hardens, walking on it will likely ruin and crack it as the foamboard compresses? What is the best way to do this. He wants to use US ply Duraweld APP polyester reinforced roofing. Is this the best roll roofing you can get?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
ransley wrote:

There are two kinds of flat roofs, those that leak and those that are gonna leak.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.