02:41PM | 09/22/04
Member Since: 09/21/04
7 lifetime posts
We currently live in a two story home with a 9/12 pitch roof. There is a 1/2 " plywood deck covered by 15lb paper and 25 year shingles. I have 2 questions.

1. We are currently tearing off the old shingles and replacing with 50 year shingles. The contractor is not tearing off the old 15 lb paper and is covering with another layer of 15 lb paper. He tells us it is not necessary to tear off the old.

What do you think?

2. We are also installing ridge vent and tearing out the old "turtle head" vents. There is also one gable end vent at the peak. The contractor also advises that soffit or eave vents are in order. We did not have them before. What he says does make some sense.

Do we need the other vents in addition to the ridge vent?


08:06AM | 09/23/04
Member Since: 07/01/03
558 lifetime posts
Not removing the old felts will not harm the new roof, but makes inspection of the deck sheating impossible. I guess the thinking here is, if I can walk on it, its in good condition. Personally, I never had the talent to do a roof tear-off and not pull up the felt at the same time. Seems like a minor issue.

Soffit vents are important because without them the roof ventilation system does not work. Roof ventilation, particularly ridge vents, is a convective ventilation system. As the attic heats up relative to outside air, the heat expands the air causing it to rise. It will escape through the ridge IF there is make up air being supplied, otherwise, it is stagnant. Providing this make-up air at the soffit allows the fresh air to sweep along the underside of the roof keeping it cooler and at ambient humidity levels. This prevents condensation in winter and heat build up in summer.


04:58AM | 09/26/04
Member Since: 06/14/04
26 lifetime posts
If you are installing a ridge vent you NEED soffit vents. You also need to remove all other ventilation, including the gable vents. Ventilation is a science, believe it or not. Over ventilating is as bad as under ventilating because it will short circuit it's self.

As far as the felt paper goes, that's just wrong. DO it right or don't do it at all. I see no good reason to not remove the existing felt paper unless he is re-using it and if he is reusing it he is cutting corners.

I would have assumed that the written proposal your eceived from your roofer says something like:

"We will tear off the entire existing roof down to the roof deck.

We will replace any rotten wood as necessary, any rotten wood replacement will carry an additional charge."

To summarize, I think your roofer is right about the ventilation and wrong about the felt.



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