For targeted protection against water intrusion at vulnerable roof areas, choose a self-adhering ice-and-water membrane, such as ZIP System Peel & Stick or HydroShield. Platinum HT-B is the better fit for buyers seeking a listed butyl membrane, while Grip-Rite and the APX synthetic roll are water-shedding roof underlayments, not self-sealing ice-and-water shields. The comparison below distinguishes the products by material and intended use so you can select protection that matches your roof plan.
| Product | Best For | Type |
|---|---|---|
| Platinum HT-B | High-temperature and butyl membrane needs | Self-adhering, butyl |
| HydroShield | Shingle roofs and simpler handling | Self-adhering shield |
| ZIP System | Full-deck peel-and-stick coverage | Self-adhering, rubberized asphalt |
| Grip-Rite ShingleLayment | Temporary water-shedding coverage | Synthetic underlayment |
| APX Synthetic Roll | Broad roof-deck coverage and vapor permeability | Synthetic underlayment |
Platinum HT-B Butyl Roofing Underlayment
Platinum HT-B is a 41-mil, self-adhering membrane made with 100% butyl. Its listed features include bonding to plywood or OSB roof decks, nail sealability, and compatibility with low-slope materials such as EPDM and TPO. The product is described as UV resistant and as meeting and exceeding ASTM D1970.
Best for: Buyers looking for a butyl-based ice-and-water membrane, including those planning to use it with listed low-slope roofing materials. It stands out in this group for its specified butyl construction and nail-sealable design. Limitation: The supplied product information does not state a maximum exposure period, so confirm project timing and installation requirements before purchase.
HydroShield Self-Adhering Ice And Water Shield
HydroShield is a self-adhering shield intended for shingle rooftops. Its features include a sand-based surface for foot grip, a split-back release liner for handling, and sealing around nails and fasteners. The listed roof-slope requirement is 2:12 or greater, and the stated UV exposure limit is 60 days.
Best for: Shingle-roof projects where grip and a split release liner are useful installation features. The product is a direct ice-and-water shield option with a clearly stated slope threshold. Limitation: It is not listed for slopes below 2:12, and its stated exposure limit means it should not be left uncovered beyond 60 days.
ZIP System Peel And Stick Roof Underlayment
ZIP System’s standard-temperature peel-and-stick membrane is designed for full roof-deck coverage, including eaves and valleys. The listed rubberized asphalt forms a nail-seal membrane intended to block water intrusion. The product also has a self-adhesive installation and a slip-resistant surface.
Best for: Buyers planning peel-and-stick coverage across a roof deck, especially at eaves and valleys where ice-dam leaks are a concern. Its full-deck design and nail-sealing feature make it a relevant choice for ice-and-water protection. Limitation: This is the standard-temperature version; the supplied details do not provide a temperature range or exposure limit, so check the installation instructions for site conditions.
Grip-Rite ShingleLayment Synthetic Underlayment
Grip-Rite ShingleLayment is a woven polypropylene synthetic underlayment, not a self-adhering ice-and-water shield. The listing describes it as tear- and moisture-resistant, with UV treatment for up to 180 days of temporary outdoor exposure. The roll covers 1,000 square feet and is presented for residential and commercial rooftops.
Best for: Roofers needing broad, temporary roof-deck coverage beneath a finished roofing system. Its long stated UV exposure period may help when installation scheduling is flexible. Limitation: It is not described as self-sealing around nails, so do not treat it as a direct substitute for an ice-and-water membrane at vulnerable areas.
APX Synthetic Roofing Underlayment Roll
This 48-inch by 250-foot synthetic roll is listed as covering 1,000 square feet and as suitable for metal, shingle, and tile roofs on slopes of 2:12 or steeper. Its features include vapor permeability, non-slip handling, and up to 90 days of exposure resistance. The listing also describes resistance to UV, wind, and tearing.
Best for: Buyers seeking a synthetic roof-deck layer with stated vapor permeability and broad roofing-material applications. Limitation: It is not described as a self-adhering ice-and-water shield or as sealing around fasteners, so use it according to the roof system’s specified role.
Buying Guide: How To Choose Roof Underlayment
Do you need an ice-and-water shield or standard underlayment?
Self-adhering ice-and-water membranes are designed to stick to the deck and seal around fasteners, according to the listed features of products such as HydroShield and ZIP System. Synthetic underlayments such as Grip-Rite and APX provide water-shedding coverage but are not presented as nail-sealing membranes. Confirm which layer your roof assembly requires, particularly at eaves, valleys, and other leak-prone areas.
Which roof slope and roofing material matter?
Check the product’s stated slope and material guidance before ordering. HydroShield and APX list a minimum slope of 2:12. Platinum HT-B lists compatibility with low-slope materials such as EPDM and TPO. These details do not establish compatibility with every roof design, so compare them with the roofing manufacturer’s instructions and local code requirements.
How long can the underlayment remain exposed?
Exposure limits affect project scheduling. HydroShield lists a 60-day UV exposure limit; Grip-Rite lists up to 180 days; APX lists 90 days. The supplied details do not give exposure periods for Platinum HT-B or ZIP System. Follow the product documentation rather than assuming all membranes can remain uncovered for the same amount of time.
What installation features should you compare?
Compare adhesive type, release-liner design, surface traction, roll coverage, and fastener-sealing claims. HydroShield lists a split-back liner and sand-based surface. ZIP System lists a slip-resistant surface and rubberized asphalt nail seal. Check roll dimensions and calculate the coverage needed, allowing for overlaps and cuts according to installation instructions.
Frequently Asked Questions
Is synthetic underlayment the same as ice-and-water shield?
No. In this product group, the synthetic rolls are described as roof-deck underlayments, while the self-adhering products list adhesive or nail-sealing features associated with ice-and-water protection.
Where is ice-and-water underlayment commonly considered?
It is often considered for vulnerable areas such as eaves and valleys, but exact placement depends on roof design, local code, and manufacturer instructions.
Can HydroShield be used on a roof below a 2:12 slope?
The listing specifies a roof slope of 2:12 or greater. It does not support use below that threshold.
Which listed product has the longest stated exposure period?
Grip-Rite lists UV treatment for up to 180 days. That is a stated exposure feature, not a substitute for following its installation instructions.
Does every product here seal around nails?
No. HydroShield, Platinum HT-B, and ZIP System list nail- or fastener-sealing features. The Grip-Rite and APX descriptions do not make that claim.