I had a very good experience from start to finish.
I would recommend them strongly. That said, I would also recommend you do not pay the balance of the invoice untill you can see how the gutters work after one full day of rain. Or if no rain is forecasted, ask them to spray your roof with a water hose and see for yourself.
Details:
First they sent someone to do the estimations. This person was very knowlegeable and patiently answered all my questions. As i requested, they provided a detailed bid to show the costs of various options. The options were: simple repair of the existing gutters, replacement with same materials, recommended upgrades (wider gutters and downspouts) and addition of the leafproof system.
They sent 2 young but experienced people, who did a really good job in a short period of time. They also checked the roof and informed me of the presence a leak (in the roof) that i was not aware of.
I decided to go for the leafproof system and this turned out to be a complicated job because of the way the metal roof on my house was designed and installed. They did a good job with it, however they were a few small leaks.
I called them and they came back to fix the leaks within a couple of days. Of course it probably helped that i did not pay the balance of the invoice when they completed the first installation, as they had requested. Thankfully it rained a lot in the few days after they had completed the job so the whole installation got a real test under heavy rain conditions. They corrected all the problems and everything is working very well.
It is too early too tell how the leafproof system will work over time as there are many pine needles that fall on this roof. But i know that it will reduce the need to clean the gutters from once to a month to maybe once every other year.
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