Place bricks as shown in illustration, 3-4 rows above gutter. If bricks slide when released, the roof is too steep for proper installation. Bricks cannot be installed onto roofs with a pitch steeper/greater than 10/12 pitch. Install 4-8 ft. apart. In areas of persistent or heavy snowfall place bricks 2-3 ft. apart. Bricks placed in gutters will aid in water flow but will not prevent ice dams. Replace as needed. White coloring beneath brick is dried brine. It will wash away as soon as brick is removed or dissolved.
For very small roofs with minimal drainage, place 1-2 bricks about 1 ft. from drain. Larger roofs require stacked pairs of bricks to effectively deice larger amounts of water. Place about 1 ft. from drain or scupper opening in area where water flows. Replace bricks as needed.
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The number of applications necessary depends upon snow accumulation. Reapplication may be necessary. A brick should last at least through one foot of melting snow.
Install the bricks just before the first real snow storm hits for best usage of the Dambuster's deicing abilities. Too soon and rain may wash away some or all of the Dambuster. Don't place if dustings or flurries of snow are predicted as these small amounts of early snow usually don't last long enough to cause ice dams. Hold out until at the first real snowfall of the new year to get the maximum deicing ability out of your Dambusters. Any unused Dambusters can be saved for next winter or longer if they are stored in a dry place.
Dambusters are made of edible salts, coarse and fine sodium chloride, sodium acetate and a blend of natural, non-toxic mineral and natural oils and waxes to extend the life of the product on the roof. It is not harmful to plants, animals or roofing accessories because they do not melt quickly and saturate the melted water with salts. The melting process of Dambusters begins at about from 25 degrees F. We only want to prevent the already melted water that is flowing down the roof surface to not re-freeze as it enters the unheated drain box and spout. This process requires much less salt than deicing a driveway or walk and therefore has far less of an effect on the roof and other contact areas.
The bricks are sold 6 bricks per carton.
Each carton weights 24 lbs; each brick weights 4 lbs.
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The amount of bricks depends on how many square feet of roof are feeding into the downspout and how much snow falls onto it. If the size is below 200 sq. ft., place the bricks in pairs, one stacked above the other and replace as needed. Main roofs average 700 sq. ft. and up and will require a full 6 pack with the bricks stacked in pairs, three layers high, 6-12 inches from the drain box opening. Most of our recent winters have had respectable amounts of snow and a spare 6 pack or two may be needed for re-application.