We have a quadrifire castile pellet stove in our basement. We use it to heat most of our home. It was installed in 2005 by a reputible company that is no longer in service. The vent pipe runs vertically from the basement, through the first floor, (through a drywalled dead space in one wall) the attic and roof. The cap is approximately 3 feet above the shingles and there are no other roof lines or dormers within at least 15 feet. Last spring we noticed that the shingles around the the vent pipe were curling up, (about a 3-4 foot radius from the pipe). The roof is not new and will probably need to be replaces in 5 years, but the shingles around the vent are damaged/weathered significantly more than the rest of the roof. The cap of the vent also has a lot of black soot on it. I don't know if that is normal. We went in the attic and inspected the underside of the roof and found no scorching or damage to the wood. We had a local chimney place come in. I hired them because I wanted them to do a video inspection of the inside of the vent pipe to ensure that the pipe wasn't damaged. When they arrived, they said they couldn't do it because their equipment won't fit in the pipe. They did a visual inspection and decided that the vent pipe is way too short. They want to add 4 more feet of pipe to the existing vent pipe which would make the pipe stick up above the roof 6-7 feet. They said we need to do this because the original pipe wasn't installed up to code and the cap needs to be higher to make sure nothing catches on fire. They will charge us $625 for the additional 4 feet of pipe, a new cap, and bracing since the pipe will be so tall. I called other dealers and installers of pellet stoves, as well as calling quadrifire. All the places, as well as quadrifire, said that the pipe did NOT need to be that long. I'm concerned about safety. Is it normal for the shingles around the vent pipe to curl and wear out faster or could it just be because more heat is moving through the first floor dead space and rising to the roof? Is it normal for us to have soot on the end cap? Should we try to find another place to do a video inspection of the interior of the vent pipe or can we assume it is safe? The first place already charged us almost $300 to clean the stove, visually inspect it, and give us an estimate for the additional vent pipe. I'm running out of money fast. We haven't been able to use the stove yet this year because we are concerned about safety. Please, can you give me some advise? We are located in central Michigan.