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By creating a barrier at the most vulnerable areas of your roof (at the eaves and rakes, in valleys, around chimneys, etc.), weather watch® leak barrier will help prevent leaks due to water backing up in your gutters, wind-driven rain, and, in the north, damaging ice dams. It will also protect your home from expensive wall and ceiling staining from leaks.

Looks better: underlayment with fiberglass reinforcement helps resist wrinkling/buckling and lies flat under Shingles
Saves labor: dual-side selvage and split-back release film help reduce labor
Dependable: self-seals around nails or metal roofing fasteners
Protection against ice dams; is required wherever the January average temperature is 25° F or lower or where there is a possibility of ice forming in the eaves (check local building codes for specifications in your area)
Dependable because it self-seals nails and vulnerable areas of the roof to help avoid leaks
Great look fiberglass reinforcement helps resist wrinkling for a more uniform look
Saves labor split-back release film helps make installation easy
Convenient 1.5 square (150 ft 2 [13.94 m 2])

General
Underlayment Grade	#30	Material	Polypropylene
Application Method	Peel & stick	Series Name	WeatherWatch
Type	Ice and water shield

Dimensions
Weight (lbs.)	64	Coverage Area (Sq. Feet)	150
Width (Inches)	36	Length (Feet)	50

Certifications
CA Residents: Prop 65 Warning(s)	Prop 65 WARNING(S) -

Warranty
Warranty	Limited lifetime

Compatibility
For Use with Flat Roofing	No	For Use with Wood Shakes	Yes
For Use with Asphalt Shingles	Yes	For Use with Metal Roofing	No

Miscellaneous
UNSPSC	30151500

Check out the Best Selling Roofing Underlayment on Lowes.com

Review

4.6 out of 5

167 Reviews

90% Recommend this product

Ratings may include incentivized customer reviews.

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What Customers Are Saying

The product appears to be a high-quality and effective underlayment, with most customers describing it as durable, waterproof, and easy to apply. Many users highlight its ability to reliably prevent leaks and water damage, even in harsh weather conditions. However, some customers have raised concerns about the product's thickness being thinner than competing options, as well as challenges with the sticky nature of the underlayment during installation. Overall, the consensus is that the underlayment is a reliable and effective choice for roof protection, though a minority of users have experienced installation difficulties.

Customer review summary generated by AI, including incentivized reviews.

167 Customer Reviews

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Great

ZebbyJune 19, 2026
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Good

Would Recommend

NikkoMay 29, 2026
Verified Purchaser

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Read instructions on the correct way to use

Would Recommend

I have never worked with this type of product before. It's a little difficult to work with.

John176March 23, 2026
Verified Purchaser

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Buy a different ice and water shield.

Would Not Recommend

This product does not stick to the decking at all. The walking surface of the product is not walkable at all. You cannot stand on it.

DerekOctober 2, 2025
Verified Purchaser

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Response from GAFProductExpert

Hello, Weather Watch Leak Barrier meets all the physical properties requirements for self-adhering peel and stick membranes under ASTM D1970. In fac...

GAFProductExpertOctober 3, 2025

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89 Questions

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COMPARE PRODUCTS

		Name	Current Item GAFWeatherWatch Ice and water shield 36-in x 50-ft 150-sq ft Polypropylene Roof Underlayment
		Ratings	167
		Material	Polypropylene
		For Use with Metal Roofing
		Coverage Area (Sq. Feet)	150
CertainTeedWinterGuard Ice and water shield 9.25-in x 3.167-ft 195-sq ft Rubberized asphalt Roof Underlayment	GAFFeltBuster Roof deck protection 48.0-in x 250-ft 1000-sq ft Synthetic Roof Underlayment	GAFStormguard Ice and water shield 36.0-in x 66.0-ft 200.0-sq ft Polypropylene Roof Underlayment	Grace Ice & Water ShieldIce and water shield 36-in x 75-ft 200-sq ft Rubber Roof Underlayment	Owens CorningProArmor Roof deck protection 42-in x 286-ft 1000-sq ft Synthetic Roof Underlayment	Owens CorningWeatherLock Ice and water shield 36.0-in x 66.7-ft 200.0-sq ft Polypropylene Roof Underlayment	RELIABILTHigh Temp Peel Stick Ice Water Barrier Roof deck protection 36-in x 67-ft 201-sq ft Butyl Roof Underlayment	Owens CorningDeck Defense Ice and water shield 42-in x 286-ft 1001-sq ft Synthetic Roof Underlayment	GAFTigerPaw Roof deck protection 48-in x 250-ft 1000-sq ft Polypropylene Roof Underlayment
	152	102	145	204	159	8	1	5
Rubberized asphalt	Synthetic	Polypropylene	Rubber	Synthetic	Polypropylene	Butyl	Synthetic	Polypropylene

195	1000	200	200	1000	200	201	1001	1000