I have a low slope wood frame patio awning being rebuilt. It currently has T&G for the deck/sheathing which looks nice, and going to stick with this. It had torchdown before, which was painted gray, but was flaking off. I really want to stick with a nice medium gray color, so TPO seems like the way to go, and it is what was recommended by the contractor and roofer.
I just found out almost last minute the roofer says he uses 1 1/4 screws to secure it, which would blow through the 3/4 T&G, and also says he puts down some sort of insulation board underneath. (Couldn’t get a good idea what exactly he is using due to not having the best english, and not quite sure why insulation would be needed for an outdoor patio cover).
He recommended adding an extra layer of 1/2 cdx over the whole thing which his insulation would then go on top of. I’m not sure though if adding all these extra layers are actually a good idea or not though. Seems with all the extra thickness between the T&G, plywood, insulation, and membrane it might be pushing the limits of what can be hidden under the drip edge. I’m just not sure if all these extra layers is a good idea or not.
He also said the insulation could be a bit soft to walk on, but couldn’t accurately describe how much. I don’t like the idea of softness that much since I actually do go spend quite a bit of time up on the patio roof just for enjoyment and various activities, some of which require good predictable footing.
He said it is possible to just adhere it to the T&G but it wouldn’t look as good. I’m wondering if this may actually be better though to avoid all the extra layers and softness. However I do worry when it is time to reroof whether it would cause problems. Since I’m using nice T&G, I would want the roofing to be able to come off cleanly in the future.
Any advice what the best approach would be to install this?