Grace recommends that the Grace Ice & Water Shield is extended a min. of 24"" beyond the inside face of the exterior wall line of a building and should extend from the eave above the highest expected ice damn. Check local codes and regulations as they may vary. If installing full coverage of Grace Ice & Water Shield, use same roof area calculation for finished roof covering.

Grace underlayments are excellent air and vapor barriers. When used in full roof coverage applications, adequate ventilation must be provided to avoid condensation problems within the roof structure or the attic space.

Yes. Grace Select meets the key performance standards prescribed by ASTM and ICBO for fully adhered underlayments in severe climates. (See ICBO Evaluation Services Report No. 3997). Grace Select also has a UL (Underwriters Laboratories) Class A fire classification for fiberglass shingles, and a Class C for organic felt shingles.

Grace Ice & Water Shield self adhered underlayment should be used in all critical roofing applications. Depending on the climate, a full roof coverage with Ice & Water Shield should be considered. For the rest of the roof, Grace Triflex 30 can be applied as a water-shedding roofing underlayment, except for the cases of full Ice & Water Shield coverage.

Grace Tri-Flex 30 synthetic roofing underlayment is a premium water-shedding underlayment. Grace Tri-Flex 30 is not designed to protect against standing water or water moving upslope resulting from factors such as accumulated snow, ice, wind-driven rain, or debris. For protection from standing water or water moving upslope, it is recommended that Grace Ice & Water Shield self-adhered underlayment be used.

Grace Ice & Water Shield is intended to be applied directly to the structural roof deck and does not need to cover roofing felt except where the two materials overlap. Laps between Ice & Water Shield and felt should be made to shed water.

Grace Tri-Flex 30 synthetic roofing underlayment is a premium water-shedding underlayment. Grace Tri-Flex 30 is not designed to protect against standing water or water moving "upslope" resulting from factors such as accumulated snow, ice, wind-driven rain, or debris. For protection from standing water or water moving "upslope", it is recommended that Grace Ice & Water Shield self-adhered underlayment be used.

leaks caused by ice dams in all climates, clearly surpassing many of the minimum standards of performance set by ASTM (American Society for Testing and Materials), ICBO (International Conference of Building Officials) and SBCCI (Southern Building Code Congress International). Although Grace Ice & Water Shield is recognized as the premium underlayment on the market today, some homes do not demand such high performance.

The main difference is in the type of adhesives. Grace Ice & Water Shield uses an adhesive based on SBS rubber, whereas Grace Ultra uses one based on butyl rubber. Simply stated, butyl rubber offers exceptional stability at high temperatures. In some roofing applications, such as those in the desert southwest, rooftops can get so hot that SBS-based adhesives can start to melt. Butyl rubber-based membranes remain stable for long periods of time even at extreme rooftop temperatures.

Ice and water-shield underlayment is a continuous membrane installed under your roofing shingles in areas subject to ice damming. It prohibits water that might get under your shingles from reaching your wood structure. The membrane is made to seal nail penetrations from your shingle installation. The best places for this membrane are along your gutter lines, in your valleys, along any walls, around your chimneys and skylights.

X-5 X-treme, V-600, V-600CS, V-400E, V-300, V-300CS, V-300-7 and All Fold-A-Vent Products can be used with any roof pitch from 3/12 to 16/12. For hip applications minimum over all roof pitch must be at least a 4/12 pitch. (The old style V-400 can only be used with up to a 10/12 pitch roof.)

No. The zinc oxide it releases is microscopic and absorbed by the shingles. It is possible, although unlikely, that the attachment nails will leave rust stains. We recommend the use of quality, double hot-dipped galvanized roofing nails, such as Maze? brand.

The roof pitch refers to the angle or the steepness of your roof. Builders can use a carpenter's square to find the angle of a roof.

In most cases, one row at or near the ridge line will be sufficient to inhibit the growth of fungus, moss or algae. On roof slopes longer than 20’, or roofs with a severe or persistent problem, install a second row halfway down the roof. While we cannot readily endorse any other installation method, you may be able to attach Shingle Shield by using a roof mastic (adhesive).

Once you have cleaned your roof, Shingle Shield Roof Protector zinc strips should be installed to inhibit the return of algae, fungus, or moss. Stains caused by pollution, pine pollen, dirt, etc., will need to be re-cleaned as deemed necessary to maintain your roof’s neat appearance.

This depends on the size of the skylights being installed. A roll of ZOZ 121 underlayment is 36 feet long and 9 inches wide.

Yes. Shingle Shield Roof & Deck Cleaner effectively cleans away stains of algae, fungus, molds, mildew, dirt, pollution, pine pollen, berries, etc. Since it contains no bleach, it will restore the natural color to the wood. Wood shingles get slippery when wet, however, so wait until they are completely dry before walking on them.