Ice-and-water membrane adds protection beneath the roof covering where backed-up water can become a problem. It belongs in the reroofing conversation, especially if your home has leaked during past winters. It does not, by itself, explain or correct why snow keeps melting and refreezing on a particular roof area.
Before signing a replacement contract, ask the roofer to show the planned coverage and explain how it fits the rest of the roof. You should be able to find the answers in the proposal, product instructions, or a simple roof sketch.
1. What protection is this layer intended to provide?
Ask the contractor to describe the membrane's job in relation to shingles, flashing, and the wood roof deck. DOE's eave-membrane guidance describes protection against water intrusion where ice-related backup can force water beneath the roof covering.
If your roof has recurring ice, ask which separate part of the project addresses that history. The answer might involve further investigation rather than extra material on the estimate.
Have the contractor distinguish any promise about preventing water entry from a promise about preventing ice formation. Ask for the limits of both claims. This is especially useful when comparing a basic reroof with a broader roof-and-attic improvement proposal.
2. Which exact product is included?
Request the manufacturer, product name, and current installation instructions. “Ice shield included” leaves too much open when you are trying to compare proposals or retain a useful record of the work.
Ask the roofer to confirm that the selected membrane suits your roof covering and the surfaces it will contact. As one product-specific example, Owens Corning's WeatherLock G installation instructions set requirements for roof slope and deck preparation, and Owens Corning makes a separate WeatherLock Specialty Tile & Metal barrier for those roof coverings. Other products have their own requirements.
Use the instructions for the product in your own contract to review the proposed installation. Save a copy and require written approval before substitutions. The contractor should identify the replacement product and explain any change in coverage, installation, price, or warranty.
3. How far will it extend beyond the eave?
Ask the contractor to mark the exterior wall position on a roof cross-section, then show the planned membrane coverage. Coverage should be explained in relation to the building geometry and applicable requirements, rather than only as a number of rolls.
DOE's eave guidance describes extending protection at least two feet inward from the interior plane of the exterior wall. Your contractor must verify the applicable local requirements and the selected manufacturer's instructions for your project.
Have the roofer explain how the overhang and roof slope affect the proposed layout. If one proposal includes “one row” and another includes “two rows,” ask both contractors to translate those descriptions into the area actually protected. Do not assume the phrases describe equivalent coverage.
4. Which other roof details are included in the plan?
Bring photographs of any previous leak locations. Ask the contractor to identify relevant valleys, dormers, skylights, chimneys, and roof-to-wall connections on the drawing. Have them show where membrane is proposed and where a different flashing detail is required.
Request a written description of what will be replaced, reused, or evaluated after tear-off. For an item left to later inspection, ask what finding would change the scope and how you would approve the added work.
You are checking whether the estimate accounts for the features on your roof. A generic line covering “all necessary flashing” is harder to compare than a proposal naming the specific details the crew expects to address.
5. How will the crew prepare the deck and handle weather?
Ask what happens after the old roofing is removed and before the membrane goes down. For example, Owens Corning's WeatherLock G instructions call for a clean, smooth, dry deck, replacement of damaged or rotted deck boards, and minimum application temperatures. The product chosen for your home should guide the actual installation plan.
Request the contractor's process for documenting damaged decking and obtaining approval for replacement. The proposal should state how that additional work is priced, without requiring anyone to predict concealed damage before tear-off.
For a late-season Minnesota project, ask what conditions would delay membrane installation and how the opened roof would be protected. Obtain the weather plan before work begins, while there is time to discuss scheduling and temporary protection.
6. How will the membrane connect with edges and flashing?
Ask the roofer to explain the installation sequence at the eaves, roof edges, and relevant flashing. Product instructions describe overlaps and edge details; the contractor should be able to identify the details applicable to your roof.
You do not need to supervise from a ladder. Request photographs before the shingles conceal the work, with enough context to show which part of the roof is pictured.
If several trades are involved, clarify who owns each connection. A skylight replacement, chimney repair, or siding project can create a handoff that deserves written coordination. Ask who confirms completion before the next layer or adjacent finish is installed, and where that confirmation will be recorded.
7. If full-deck coverage is proposed, what supports that recommendation?
Ask why the contractor recommends membrane across the full deck for your house. The explanation should consider the selected product and the roof assembly, including how moisture will be managed. Request the applicable manufacturer guidance rather than assuming more coverage automatically answers every roof problem.
Owens Corning's WeatherLock G instructions state that proper ventilation is required when the membrane covers the entire roof deck, and they direct installers to a design professional and local building codes. That illustrates why an expanded scope deserves a product-specific review.
If the home has a cathedral ceiling or planned insulation changes, ask whether the proposal needs input from a building-performance professional. Record who will review the combined design. You should know which professional is responsible for answering questions that extend beyond replacing the exterior roofing.
8. What proof and warranty documents will I receive?
Ask for a completion package that identifies the product installed and documents concealed details. Request the applicable material and workmanship warranty documents, including whom to contact and what information they need if a leak occurs. Have the contractor explain relevant exclusions before you sign.
Add this request to your estimate discussion
“Please identify the membrane product, mark the planned coverage on a roof sketch, explain the eave and flashing details, and describe how the deck will be prepared. Please also include the weather plan, any full-deck design review, and photos before the membrane is covered.”
Keep the answer with the contract, approved changes, and completion photos. If a future question arises, those records give the next inspector a more useful starting point than a photograph of the finished shingles.
Discuss your roof replacement with Committed 365 Roofing. Mention past ice-dam leaks and ask to review membrane coverage as part of the written roof scope.