What weight/number felt paper should I run over the Ice and Water shield?
If you’re going to Ice and Water the entire roof then I guess you could go ahead and use 15 pound felt. The normal standard is to use doubled 30 pound with no Ice and water in the field area. I don’t think it matters for your application because it’s just going to be a buffer layer between the I&W and the tiles right?
**Also is it OK to staple the felt paper on top of the I/W shield? **
We don’t staple here, it doesn’t hold the underlayment well which in turn makes it dangerous to walk on. Use stapes if you like but “plasti-top” or “simplex” nails hold best.
Does the stapling have to be done the same day I lay down the I/W shield?
I don’t understand the question. If you’re asking do you need to put down the I&W and the paper on the same day the answer is no.
Should I maybe use one of those synthetic underlayments you mentioned instead of regular felt paper on top of the I/W shield?
No. The synthetics are nice but expensive and going over a full application of I&W is complete overkill imo.
**I had to replace the wood for the built in gutters, since I am laying down new copper in the built in gutters (this section of the roof got damaged beyond repair, I tore everything down and started with new wood), I just want to clarify, I just lay down the I/W on top of the copper and for this part I don’t put any felt paper since their will be no tiles on top, right? <— I know this is obvious, but I just want to double check everything, considering the significant investment this project is turning out to be. **
Again I don’t realy follow. You’re installing built in copper gutters? Next to impossible to do right if you’ve never done it before. Most professionals don’t even know to lock and pre-tin their seams, heh.
In any case you would totally and neatly line your entire built in gutter with I&W barrier. Use High Temperature because you’re going to solder over it. The normal I&W will melt or catch fire. After the I&W you want to line the gutter with a “slip sheet”, red rosin paper works well. Again, like the tile, this provides a buffer between copper and I&W so the gutter doesn’t stick. Then your copper goes last. Make sure you pre-tin and lock all seams or suffer the consequences.