This is caused by the squeegee being angled incorrectly forcing the water under the rubber blade out into the dry area of the glass or from solution being pushed up into the top edge of the window.
Although there is a slight difference between our original calculation and Teslaâs new oneâlast fall we built in a cost of $6,500, Teslaâs current cost for a Powerwall as part of a Solar Roof installation is $7,000.
1 Installing CertainTeed Designer, Premium Designer, and Luxury shingles costs around $4 to $6 per square foot, or $8,000 to $12,000 for a 2,000 square foot roof.  If the cost to remove and dispose of old shingles is not included in the price, this could add an additional $1 to $4 per square foot.