Underlayment

The weather is very predictable here if you keep a close eye on the radar.

Only exception is the summer months when the heat can pop up a storm right over your head with little to no warning.

So, I keep the roofs nailed back on as we go along, have the tear off guys keep the felt laid and have a large tarp nearby at all times especially in the summer months.

As far as installation goes, I'm w/ Woody. Titanium all the way, because of ease of installation and traction. Most synthetics are better suited for a water slide. On 4 & 5/12's we sometimes run 15# to save money.

We installed 15# primarily for years. What I always thought was amazing was all the times when rain would popup WHILE we were roofing causing rain to run beneath the newly laid shingles....and NOT leak. We did a good job w/ felt, which we all know can mean putting a lot of patches on, mainly over plank.

We normally have tarps ready, but rain happens.

I've had titanium 30 on my chicken coop for almost 2 years now. Although it does look like it could leak anytime soon. Maybe I ought to get a roof on there.

Never use grace. The synthetic we use is not slippery at all. Just the opposite.

When it gets wet???

Still using felt. Feel like I'm just using plastic tarp without grommets when using synthetic. Tried Deck Armor and lifted it the day after a rain. Deck was wet and took 2-3 hours to dry before I could work again.