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OP
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House is 20 something years old. I know a new roof is on the horizon.
I see and hear of some slapping another layer of shingles on, leaving the old ones in place..
Seems like a hap hazard way of doing chit...
So, of course, my question is, add another layer or tear it all off and start over ?
Any helpful ideas would sure be appreciated ! Also any input on the felt/paper would be great.
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Joined: Aug 2010
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Campfire Ranger
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Campfire Ranger
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If you can afford it, I’d probably lean toward a tear off. A bunch of houses have two layers though around here.
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Joined: Dec 2003
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Campfire Oracle
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Campfire Oracle
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A lot depends on roof construction.
If you take the time it takes, it takes less time. --Pat Parelli
American by birth; Alaskan by choice. --ironbender
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Joined: Aug 2015
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Campfire Outfitter
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Campfire Outfitter
Joined: Aug 2015
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As long as there is only one layer already, unless your roof has structural or water damage issues I wouldn't have a problem adding another layer. But never more than two layers, and only if the framing will support the added weight.
Last edited by NVhntr; 04/13/24.
Let's Go Brandon! FJB
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Campfire Outfitter
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Campfire Outfitter
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OP
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I'll have to look.. I know the walls are on 16'' centers also 2x6 outside walls.. Can't remember the roof right off..
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Joined: Jun 2004
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2004
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If you are contracting it out, a lot of roofers will not overlay and if they do they offer no guarantee.
Tear it off, inspect the sheathing, then apply the appropriate underlayment like Ice-n-Water barrier and get a guarantee.
Give a man a fish and he eats for a day. Give a man a welfare check, a forty ounce malt liquor, a crack pipe, an Obama phone, free health insurance. and some Air Jordan's and he votes Democrat for a lifetime.
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Campfire Outfitter
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Campfire Outfitter
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Some jurisdictions require complete tear off
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Campfire Outfitter
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Campfire Outfitter
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Since it's probably the biggest investment a your life so far, you should go as cheap as possible when protecting it.
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Due to the increased price of ammo, don't expect a warning shot...
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Campfire Kahuna
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Campfire Kahuna
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Best to tear it off. Get to bare wood, make an assessment of any questionable decking issues.
New from the decking up.
Manufactures I believe will not warranty the new roof is it doubled. Many little events can occur namely, old nails working up from beneath and cutting thru thr new shingle
Be diligent about getting all of the old roofing nails out of the deck. Go back and rehammer down the decking/plywood nails. Add a few new ones too
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Joined: Sep 2023
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Campfire Regular
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Campfire Regular
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Tear off is the best. While your gathering information on a new roof, read up on continuous ridge vent. Put a few on and they work great. They make different sizes. Most places stock the minimal coverage type but you can order the larger type for more lap over the ridge.
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Joined: Dec 2013
Posts: 44,308
Campfire 'Bwana
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Campfire 'Bwana
Joined: Dec 2013
Posts: 44,308 |
Best to tear it off. Get to bare wood, make an assessment of any questionable decking issues.
New from the decking up.
Manufactures I believe will not warranty the new roof is it doubled. Many little events can occur namely, old nails working up from beneath and cutting thru thr new shingle
Be diligent about getting all of the old roofing nails out of the deck. Go back and rehammer down the decking/plywood nails. Add a few new ones too ^^^^^
Slaves get what they need. Free men get what they want. Rehabilitation is way overrated. Orwell wasn't wrong. GOA member disappointed NRA member 24HCF SEARCH
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Joined: Dec 2003
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Campfire Oracle
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Campfire Oracle
Joined: Dec 2003
Posts: 86,196 |
Tear off is the best. While your gathering information on a new roof, read up on continuous ridge vent. Put a few on and they work great. They make different sizes. Most places stock the minimal coverage type but you can order the larger type for more lap over the ridge. Does a continuous ridge vent work well with 4’ of snow over it? 😂
If you take the time it takes, it takes less time. --Pat Parelli
American by birth; Alaskan by choice. --ironbender
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Joined: Sep 2023
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Campfire Regular
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Campfire Regular
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I seen the guy was from Texas, does he get 4 feet of snow there?? In all honesty I would have to read up on the snow issue.
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Joined: Dec 2003
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Campfire Oracle
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Campfire Oracle
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It was TIC. I don’t think I’d install one here.
If you take the time it takes, it takes less time. --Pat Parelli
American by birth; Alaskan by choice. --ironbender
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Joined: Nov 2014
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Campfire Member
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Campfire Member
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You will get half the life, maybe, out of that second layer. extra heat on the original layer will cause the tabs to curl, and they will curl your new shingles along with them.
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Joined: Sep 2023
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Campfire Regular
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Campfire Regular
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Just read ridge vents and snow from Fine Homebuilding. Google it! They have a good outlook on using it.
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Joined: Jul 2007
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OP
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Perfect, to the decking it is...
I live way the hell out in the country. Even so, guess it's been awhile since I've seen two layers..
No or very little snow, but the area did just go though a lot of wind and hail.. Lots of stuff destroyed...
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Joined: Dec 2021
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Campfire Tracker
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Campfire Tracker
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Heck no! Insurance companies allow 2 or 3 layers. If you go from composition shingles to metal, your home insurance company will reduce your payments! A metal roof is cheaper than shingles. Metal will last 50 years or more and is literally maintenance free!
The one downside to a metal roof is you'll have to sign a cosmetic rider. If a hail storm hits your metal roof and dents the heck out of it, the insurance company won't replace it unless the hail actually breaks the metal.
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