this video is a great example of the saying "poor people pay twice - by trying to save money on something and having to redo it the right way later anyhow"

Nice work!

I have never seen black (PVC?) used for potable water supply.

I don't know why KZfaq suggested this video but it was painful to watch... Heat wires burn down more houses than anything else if statics are to be believed. Insulate, but leave the space open to be heated from the house