I have aluminium siding on the exterior of my house. I was replacing the exhaust vent and noticed that the aluminium siding was placed on top of another siding. This siding seems to be made up of granular rubber. Does anyone know what this is? Please see the picture below.
So there is plywood and the rubber siding and then there is another plywood and on top of the plywood is the aluminium siding.
I was thinking of insulating with cellulose in the wall cavities. Since there are apparently two sidings installed, I am not sure insulating would be a good idea since the house won’t be able to “breathe”.
Thank you for your responses.