Does anyone know if the adhesive used for membrane roofing will stick to Grace I&W. I’ve got a small job where the membrane would work well (I think) but it’s got I&W over it now.
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You'll have to use cover board over the IWS or it won't work.
There are a number of different membranes for roofs.
most common in my experience is EPDM which is incompatible with bituminous products like I&W which cause perforations when in contact. Walter is right that you need an isolation board made for this, or a 3/8"ACXplywood
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