Here we examine a recent roof installation that suffered ice dam formation and leaks despite the installation of an ice and water shield membrane and attic venting. The membrane may be installed either vertically or horizontally. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on www.gcpat.com. Not compatible with EPDM or TPO; use GRACE ULTRA™ underlayment for tie-ins (refer to Technical Letter 5. (150 mm), 9 in. Ice Shield (also known as ice and water shield, or I&W) is a thick asphalt or bitumen based reinforced membrane. Ice under the drip edge, and ensure it covers the junction of roof and fascia. Decks shall have no voids, damaged, or unsupported areas. Nearly four decades later, it's still the product building professionals trust to protect their projects. Ice Shield (also known as ice and water shield, or I&W) is a thick asphalt or bitumen based reinforced membrane. Peel back 1–2 ft (300–600 mm) of release liner, align the membrane, and continue to peel the release liner from the membrane. x 75 ft. (225 sq. It will also cause the bottom course of plywood to become wavy and not last as long as the shingles life expectancy. Follow-up question re: Ice and Water Shield. Check with the manufacturer of the metal roofing system for any special requirements when used under metal roofing. Repair holes, fishmouths, tears, and damage to membrane with a round patch of membrane extending past the damaged area 6 in. Peel the release liner from the membrane. My guess - with the steep roof, and assuming the roofer put ice and water shield correctly along the bottom 6 feet (3' by code, but should be 6' in your area) I don't see roof leakage as most likely being the problem, so trashing the soffits, some sanding on the rafter tails to remove molded or slightly rotted surfaces, maybe a bit of tip trimming, installing drip edge and new fascia board and replacing gutters … I have always been of the opinion that excessive interior moisture inside a … Place metal drip edges or wood starter shingles over the membrane. Certain product applications are prohibited in hot desert areas in the southwestern United States. The maximum exposure time is six (6) months. Peel the release liner from the membrane. A: Tom Silva replies: First, your roofers should lay down an ice and water shield over the entire roof. Hand nailing generally provides a better seal than power-activated nailing. But really, I don't think it's a big deal, just get a dag-gone roof on the thing, get closed in and get some heat / dehumidifier rolling in there. Grace Ice & Water Shield also offers leak protection in trouble prone spots like valleys, skylights, protrusions and other flashing areas. Lv 7. I'm always curious as to why people choose peel and stick vs fluid applied vs integrated (e.g. Align the membrane and roll in the intended direction of the membrane application. How to Apply Grace Ice & Water Shield 9 10 Some contractors prefer the back-roll method for applying Grace … Exposure — A northern exposure or shaded areas will generally contribute to larger ice dams. (150 mm). Peel back 300-600 mm (1-2 ft.) of release liner, align membrane. Our county does not have a building code, and this is in the county. Apply the membrane to the entire roof deck for wind-driven rain protection. No problem. Roof decking will last and function best when allowed to breathe from both sides. Apply a new layer of GRACE ICE & WATER SHIELD® underlayment directly over the old GCP self-adhered underlayment (except GCP granular underlayments) in retrofit applications following the standard membrane application procedure. A: Tom Silva replies: First, your roofers should lay down an ice and water shield over the entire roof. GRACE ICE & WATER SHIELD® membrane can be applied over the old GCP self-adhered underlayment in retrofit applications, making re-roofing easier, less costly (since there is no need to remove the existing underlayment), more durable and environmentally friendly (as the structural deck remains intact avoiding the need to purchase additional wood decking). Protrusions from the deck area must be removed. As a suitable substrate to which the roof membrane or roof system is attached. WinterGuard will not adhere to wet or cold surfaces. Peel back about 6 in. GRACE ICE & WATER SHIELD® roofing underlayment meets the following standards: We hope the information here will be helpful. Share this conversation. This is a rubber-like material that adheres directly to the plywood and, whereas felt does not stick to the wood, the ice and water shield adheres tightly to the wood surface. Peel back 300-600 mm (1-2 ft.) of release liner, align membrane. The rubberized asphalt surface is backed with a foldless release paper that protects its adhesive quality. This shield is placed on top of the wood sheathing and under the shingles on your roof. Overhang — A wide overhang will require more membrane to reach the appropriate point on the roof. In locations with a history of ice formation along the eaves that can cause a backup of water as described in Table R301.2(1) install an ice barrier consisting of self-adhering polymer-modified bitumen sheet or two layers of underlayment cemented together. Work from the center of the valley or ridge outward in each direction and start at the low point and work up the roof. Faster application of the membrane in the straight-aways, as well as ease of membrane positioning in detail areas (valleys, around dormers, etc.). Answered in 4 minutes by: … Ice & water shield is a thick, sticky-back underlayment (also known as felt paper) that will adhere to your roof deck and prevent water from seeping into your home if it gets under your shingles. The valleys should then be covered with metal flashing or weaving. The proprietary adhesive if formulated with a temperature resistance of up to 260°F. It is … Peel back about 150 mm (6 in.) Align the membrane and roll in the intended direction of membrane application. These roofs can reach extremely high temperatures due to the low reflectivity, high absorption, and high conductivity of the metals. Do not install directly on old roof coverings. Roofing 502 applies Ice and Water Shield along the … This self-adhered membrane is highly durable and comes in a 225 sq. And it can be applied under most types of roofing shingles, including metal, tile, shake, slate, and both asphalt and synthetic shingles. Grace Ice & Water Shield® Easy measuring for fast, simple installation. Carefully cut the release liner on top of the roll in the cross direction being careful not to cut the membrane. Proper installation of Grace Ice & Water Shield® The Conventional Method. Prior to the application of … Show Less. As far as workability, this product can at times be difficult. In Canada, GCP Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6. Prime wood composition and gypsum sheathing with PERM-A-BARRIER® WB PRIMER if adhesion is found to be marginal (refer to Technical Letter 12, Use on Oriented Strand Board (OSB) Roof Sheathing). Company #2 recommends full coverage of entire roof deck with Ice and water shield. ICC ESR-1677 approval according to AC-48 Acceptance Criteria for Self-Adhered underlayments used as Ice Barriers, Miami-Dade County Product Control Approved. Made of polyethylene and rubberized asphalt, this membrane prevents water that has slipped under shingles from penetrating to ceilings below. Get a moisture meter and keep an eye on it. In cold climates, it is particularly important to provide proper insulation and ventilation to reduce the size of ice dams and to avoid interior condensation. If there are any conflicts or if you need more information, please contact GCP Customer Service. The largest application of the melamine formaldehyde resin is in … Alco Products 24/7 Ice & Water Shield Underlayment - Single Roll. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right. There RIPCORD® Split Release on Demand are two easy ways to install it. In 1978, GCP Applied Technologies — formerly Grace Construction Products — developed the first self-adhered roofing underlayment: Grace Ice & Water Shield®. If fasteners are removed leaving holes in the membrane, they must be patched. Oh well, I'm sure the Grace Ice/water shield is shot due to the wet OSB. The back-roll technique can go quicker than the conventional method since you can lay down the membrane in just a few minutes! If any. Melamine formaldehyde glues are not extensively used for plywood gluing but are used where a high grade bond is required, and where black phenolic glues cannot be tolerated. These convenient reference markings help make installing Grace Ice & Water Shield® easier than ever before… 5 Grace Ice & Water Shield is Available in 2 Roll Sizes: • 108 sq. (300 mm) and 18 in. Apply the membrane in valleys before the membrane is applied to the eaves. It is essential to use an ice shield in critical areas such as eaves, rakes, ridges… Strap clamps won't form depressions in the wood, but they aren't strong enough to bend thick plywood. A: It is never a good idea to install a roof over wet plywood or any type of roof sheathing. For valley and ridge application, peel the release liner, center the sheet over the valley or ridge, drape, and press it in place. Grace Ice & Water Shield Roofing Underlayment 36 in. water back-up from ice dams or wind-driven rain. (90 mm) and end laps a minimum of 6 in. Apply roof covering material at temperatures of 40°F (5°C) or higher. Engineered for use under all roofing materials. Also you better find and cure the source of the water, first, also. Can I put ice and water shield over wet/damp plywood? Don't interior finish until the moisture in the wood has stabilized! Carefully cut the release liner on top of the roll in the cross direction, being careful not to cut the membrane. With a quality Ice and Water shield that has been on the roof for awhile with some heat on it, you would not be able to tear it off without delaminating some of the plywood. GRACE ICE & WATER SHIELD® roofing underlayment should be used in conjunction with roof designs that minimize ice dam formation. For cold weather tack down, use only roofing nails. Waterproofing Plywood: 3 Ways to Protect Plywood Plywood is an excellent material that is used in different types of construction. And it has caused the stuff to expand … If nailing of the membrane is necessary on steep slopes during hot or extreme cold weather, backnail and cover the nails by overlapping with the next sheet. For successive membrane courses, align the edge of the release liner with the dashed line provided on the surface of the membrane to achieve the 3.5 in. Some suitable deck materials include plywood, wood composition, wood plank, metal, concrete, and gypsum sheathing. We roof in the middle of … Peel the release liner from the membrane. Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. Grace Ice & Water Shield sticks to OSB without any primer. Once there it will saturate plywood, … Ice and water shield solves a problem for homeowners – it creates a waterproof seal for nails passing through that keeps melting ice out of the building. Cover WinterGuard as soon as possible with a permanent roof surface. Do not install under copper, COR-TEN® , or zinc metal roofing in high altitudes. can I install ice and water shield (waterproofing) over house wrap (ever built) on the side of a house or do i need to remove the house wrap first and apply directly to the sheathing?this was a change in siding material plan where now a rain screen system will be put on instead of siding. MFM Wind & Water Seal™ is a 40 mil, self-adheringroofing underlayment composed of a non-slip polymer film laminated to a high-temperature rubberized asphalt adhesive.A split release film protects the adhesive and is removed as the underlayment is installed. Stop frequently to press the membrane in place with heavy hand pressure. During application, the re… It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Install GRACE ICE & WATER SHIELD® roofing underlayment directly on a clean, dry, continuous structural deck. Removing snow from a roof edge or installing heat cables may not prevent ice dam formation, but may shift the location of the ice dam.
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