Browse Forums General Discussion Hi, I have an area of zincalume cladding encasing a number of external downpipes. Unfortunately one of them has been permanently stained by some diluted phosphoric acid -… 0 899 7 5726 I am saying that double brick has similar thermal performance due to thermal mass effect. It will be still very interesting to see the state of your framing after 10-15… 10 29659 |