Hi,
I'm not a builder. My father in law is building a tool house and we'll be putting on a pitched roof. I already have some marley modern double roman roof tiles left over from when my house was reroofed some years back. I've seen on some local trading sites double roman tiles made by other manufacturers to Marley. Are they of the same specification and I can mix them, or would I have to use just one manufacturer?
Thanks in advance.