Is this a normal practice?

[smithmiller6]

I'm having a new roof put on due to hurricane Ike. I noticed the crew that was sent over is simply taking off the old shingles and then laying new tarp paper over the old tarp paper before putting on the new shingles.

Is this a normal practice?

They did in fact replace one peice of plywood so far on the back of the house. when I asked how they knew to replace it, they said they could feel the sag with their feet. Shouldn't they also take up all the old tar paper to know if there is damage underneath?

[mossrisjhons]

absolutely yes

[mariyasmth11]

Yes, this is a normal practice? Or, yes, they should take up the old tar paper?

[HayZee518]

if the tar paper is old and cracking then it should be replaced. you start putting good over bad, all yer gonna get is a build up of roofing materials. eventually down the line the whole thing's gonna hafta get ripped up to the sheathing. by then you'll probably have rotten boards.