I'm planning to put a garage and porch extension on my house.
I understand I'll have to install cavity trays in the existing wall (1960s semi) above the roofline for the porch because the wall will change from being external to internal. (I do need to do this don't I?)
So I also need to do this above the roofline for the garage?
I'm keen to avoid doing this on the whole lot if possible as it'll be a lot of hard work!.
I've attached a picture of the project below.
http://img184.imageshack.us/my.php?imag ... rance01ap2