It won't let me rate with zero stars (so I gave a one). Interlock was installed prior to our home purchase. We are currently in a renovation and had some tiles removed to extend the roof for the new reno (with additional new metal tiles). ALL work is done by contracted installers - not employed members of the company. NO response or EXTENDED DELAYED response to calls - even with a leak! Our roof is currently leaking where they removed tiles and we have been leaving messages for days with no response. AVOID if you want to have a dry home.