New garage door opener belt sags when opening

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I recently replaced our chain driven garage door opener (which functioned fine for 9 years) with a Chamberlain MyQ opener which runs off of a belt, instead. It was nearly a direct swap and all works as desired except… when opening the door, the belt on the non-pulling side is very loose. So loose that it drags along the top of the door as it's pulling up.
It's been suggested from neighbors that this is not normal, and I'm not sure what/if there's a solution for it.

The door is a typical steel rollup with the addition of styrofoam insulation on the interior, and cedar veneer on the exterior. The cedar is heavy. Pulling the quick release to open the door by hand takes some effort, but is not too burdensome and it lifts without any dragging or catching. The majority of the cedar veneer is 5/8". What is seen in the pictures below includes a 3"x5/8" border on top of the vertical planks.

The motor seems to show no signs of strain (and neither did the old-lower-powered one)

So, the cascading questions are: 

Is this really abnormal?
Could it be due to the added weight of the cedar, thus is the belt not adequate?
Can/should the roller springs be adjusted or upgraded to accommodate the added weight 
of the cedar?

Thanks for your assistance —

This is a Youtube link to a video demonstrating what I'm experiencing, and some closer pictures below

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Best Answer

I have a chamberlain opener similar to yours... it is great because it is so quiet.

You are righ to be concerned, that loose belt is a problem. You should get a copy of the installation instructions from the Chamberlain web site (if you don't still have yours) and follow the procedure for installing the belt with the right tension. The belt needs to be connected with the tensioner loosened, so that the tensioner can be used to take up any excess slack. The specific procedure should be in the manual for your unit. But basically, assuming the belt is attached with enough slack removed, the tensioner bolt should be able to taske up the rest of the slack once tightened. I think there is a lot to how much you can tighnen at tghe tensioner, so you may need to loosen it and re-attach the belt with less slack.

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