Non tarpaper peel+stick for best screw sealing


#1

what self sealing peel+stick product is the best
compo of price strong sticking and sealing
and has a LONG LONG LIFE [I DONOT WANT TO DO THIS AGAIN EVER ]

I am using 5v metal on top of the roof
and want a good seal on the screws for the 5v

IS A DOUBLE LAYER OF P+S A BETTER SEAL ?
if not what is the best under layer product to use first ?

got the front 1/2 of the roof off clear of nails ect
survived the last front with heavy rain under a doubled plastic sheeting


#2

High temperature Grace is a very good product, better than advertised.


#3

MFM makes a very competitive and long lasting product called Wind & Water Shield Ultra HT.
The main thing you need be aware of under metal is the use of a high temperature rated underlayment. Regular asphaltic underlayments tend to run when subjected to high heat like that generated under a metal roof. Axiom noted to use the Grace Ice & Water Shield version of high temp which is also a good product. Don’t let anyone sell you “regular” Grace or other brands that are not listed as high temp.
Lifespan on these membranes is great and should serve you for many, many
years.