If you have a metal roof you generally don t have that problem because even if you do get ice it s going to build up at the edge.
Ice and water shield for metal roof.
Ice and water shield is a great product that can be used in spots to protect the most vulnerable areas of your roof or as a whole roof underlayment to protect from ice dams water dams storms and leaking in any area of the country and any weather.
Ht specifically for use under metal roofing.
Most manufacturers of fully adhered roofing underlayment or ice and water shield offer their product in two major categories.
There are chemical concerns depending on your metal finish so you should confirm with the metal roofing supplier.
Specifically designed to meet the challenges inherent in metal roof assemblies delivers all the advantages of grace ice and water shield with thermal stability up to 260 f seals around roofing nails resisting leakage caused by water back up ice dams or wind driven rain can be left exposed for up to 120 days.
Hence it s name is ice and water shield.
And also in southern climates it s put on the entire roof because even if the shingles blow off it keeps the water out.
These categories are regular and what s known as high temp i never really thought too much about the difference until a customer of mine had a problem with a black substance oozing out between the metal diamonds on his roof.
Grace ice water shield is a versatile underlayment material that may be used on sloped roofs under mechanically attached roof coverings such as asphalt shingles slate tile cedar and standing seam metal in many climate and assembly conditions see limitations for additional information.